Model Builder: January 1975

1’, |O DELzZ BUILDER JANUARY 1975 a volume 5, number 37 | gs Mast rigging on an EC/12. Clean and efficient. (Pardon the telephone wires). g Jenny strut detail on an EC/12. Cleat is for jib stay. Flat bowser/tang is for jib halyard, and controls luff tension. Put straight edge on 102’s jib luff, see how much sag is allowed by having separate fore- stay carry part of mast load. By ROD CARR @ Next month we are planning to start a 2 or 3 installment series on construc- tion of a fiberglass-hulled 50/800. This is in response to an increasing number of requests for really basic constructional information on R/C sailing yachts. Before launching such an ambitious undertaking, we’ll try to clear up a number of odds and ends which have been begging for attention. Most important is the new Secretary for AMYA. He is Bud Salika, 3917 Sunnyside Avenue, Brookfield, Ill. 60513. (Is he an “odd” or an “end”? Sorry, Bud, couldn’t resist that! wcn).He will handle your $5.00 annual dues as well as your vessel registrations. | had the good fortune to finally shake hands with Bud after many years of trading correspondence, and am very pleased that AMYA is again armed with a strong Secretary who really keeps the paperwork flying. Remember to renew your AMYA membership in order that you won’t miss a newsletter issue in the 50 al shuffle. * * * San Franciscans will be happy to know that the Bay Racing Association has become AMYA Sanctioned Club No. 38. This group is headed by Harold Sleight, 330 First Street, San Francisco, Ca. 94105, who may be contacted for further information regarding sites and Sailing times. Sanctioned Club No. 39 is Ontario Radio Control (Yacht) Club, being headed by Rich Whan, 804 Nicholson Ave., Ottawa, Ontario, Canada K1V 6N5. This club is experimenting with two different approaches to Racing Rule usage. First, they are not allowing a yacht in a race to touch a buoy, and secondly, if a foul is committed, a judge assesses a 360° turn against the offending boat. Rich says they are lucky to have one good judge who can make these decisions while the races are underway. (What happens if he stays home with a Chuck Black’s monster 12 meter, 75° LOA, 2000 sq. in. of sail, reaches in a fresh breeze, San Diego’s Mission Bay. sore throat? And aren’t there times when MODEL BUILDER WI ing. FCC, AMYA, manufacturers and publications, are all listed in one place to allow the novice to gather the materials he needs to choose a class of vessel. K * * Figure 1 is an idealized-sketch of the typical rig which is used on our boats. It is very much like the full sized Lightning Class rig. | have on hand acopy of a booklet titled “A Collection of Reprints and Excerpts on Tuning, Rigging and Sailing” obtained from the Lightning Class Association, 808 High Street, Worthington, Ohio 43085. It cost $3.00 to the best of my recollection. Some of the data, such as that on crew positioning, is not pertinent to our uses, but the major part of the discussion on setting up the boat is a great help, as all the information on sail shape, mast shape, etc., is directly applicable. Worth tracking down in case you are really serious about improving your boat. Continued on page 65 Figure 1 Model Masters Open 36/600 Class winner, a Huson 36 with extra detailing. 1/8” Thick 1/16” Dia. \ Upper shroud esas FLAT BOWSER a protest hearing ought to be held?) We recently discussed the Heat List problem in these pages. A little midnight oil and some broken pencils have produced two heat lists which we are using in local contests with excellent results. They are: the MARK 16…12 heats siabinnan aS Upper shroud Overhead view of Huson 36. See text for discussion of rigging and sails. 1 oo ROUND BOWSER ms) x 3. for 16 boats (two boats per frequency); the MARK 30… 12 heats for 30 boats (3 boats per frequency). | would be hap- py to send copies of these to anyone who will send me a stamped (204), selfaddressed envelope. (See address at end of column). A discussion of the 50/800 ACCR Heat List will be found in the Club News Column of the Fall 1974 AMYA Quarterly Newsletter. It is quite revealing. Also, we can provide an information sheet containing all the names and addresses for getting started in R/C yachtJANUARY 1975 SS 51 parallel leaches on main and jib. Notice that even though the main twists off quite a bit, the jib leach follows it as shrouds and a backstay! Granted, all this rigging adds wind resistance, but if you haven’t the ability to control the One proceeds up the mast. Though it is shape of your sails for maximum effi- risky to make suggestions ciency, you can kiss the silverware good- bye. The upper and lower shrouds ter- minate at the deck in turnbuckles, while on photographs alone, | would have possibly tried a little more tension on the main vang to slightly reduce the mainsail twist. On the other hand, if you’re out the backstay usually has a bowser adfront, don’t get greedy and start fiddling justment for greater movement and alwith everything!!! lowing a fore and aft movement of the * * * rig for balancing the hull/rig combina| recently heard a proposal made tion. The jibstay terminates in a rack as shown last month, or at a tang or eye on the mast near the jenny struts. (See photo). Provision is made for adjustment of both forestay and jib halyard to change mast rake. | prefer to cleat both to the mast, as | do not trust bowsers (especially the round ones) to carry forestay loads without slipping. | will again say that the best way to learn about your rig is to set it up on the boat and experiment with it by – sighting down the mast, or by looking up the mast with a mirror. If the mast cannot be stayed absolutely die straight, chuck it and make a new one. It should be straight before any rigging is put on it anyhow. | use 3/32 OD brass tube for spreaders and jenny struts. The latter are pushed through the hole drilled in the mast and bent to the proper angle. The former are installed the same way, and installed the same way, and retained by within the hallowed halls of AMYA that would have increased the penalty for committing a foul on the race course from 2 points to 3 points. The rationale was to make the penalty more severe and in so doing, encourage people to do a better job of learning the racing rules. When asked for my opinion, | hummed and hawed and finally came to the conclusion that the point assessment had nothing whatsoever to do with the actual goal… learning the racing rules better … | suggested that maybe a continuation of the racing rule discussion in AMYA’s Quarterly Newsletter would help. But in addition, | think that we need a good, comprehensive reference that an individual skipper can study. Just reading the rules didn’t seem to work for me. And since the rules themselves are not arranged in the order in which you are prone to meet the situations, it was hard to decide just which soldering some drilled out tangs to prevent athwartships movement, as well as rules were important and which were only used sometime. to provide points of attachment for jenny stay turnbuckles and lower shroud The answer lies in a beautiful book, terminations. (See photos.) Make the holes a tight friction fit on the tubing, and after installation, flatten the tubing ends and drill holes for the rigging wire to fit through. (We use 30 pound test Steelon rigging. shops in pick up plastic covered leader wire for It is available in sporting goods 25 foot rolls. Remember to also the proper size swaging sleeves while you are there.) Every hole you put in a mast weakens it and makes it more prone to take up a shape other than a straight or smooth curve. Contrive to make your mast attachments as few and as far apart as possible. There INVITATION TO SAILBOAT RACING, written by published the by late Simon Alan and Brown and Schuster of New York. In Part I, he covers the layout of the course, start and finish lines, and the proper manner of sailing around the course. Part Il explores the 6 Basic Rules and the maneuvering which occurs at the marks. Each page is text plus diagram, and the format is almost like the programmed learning text which many of us have encountered. The 6 Basic Rules cover 90 percent of the problems which you will encounter on the course, and are as follows: 1. The Opposite Tack Rule (NAY RU Rule 36) ”» Ru e (NAYRU Rule 44) oe 52 As you notice from the North Amer- ican Yacht Racing Union (NAY RU) Rule numbers, the important ones are sprinkled all over the place, and some, such as No. 5, are sub-parts of other rules. Mr. Brown has done a beautiful job of providing us with the means to become knowledgeable skippers. He sets up a situation in words and a diagram, and then requires you to respond with an answer that demonstrates your grasp. After studying with him for a while you will find yourself seeing the same situations occur on your local lake. Now you are ready with the correct response for your vessel. | think any skipper without acopy of Brown’s book is really lessening his chances on the race course, since he must not only be fast, but right, as tactical situations develop. * * ® s o B e = Oo” ~ Es oO ~ Qe S 2 oS 7S GEOr = ae CL — oe SR eae aa. OO SY’%YE Oy) . & Se EC osQa-D S= | ees oer O = oO © of Ine OFwWr J 7 SE Vy OSS in Or ZzON by j ae oL © x Ss % £6 ras y es D4 of > Q2oeE * Since we first mentioned the prototype a few months ago, a number of new HUSON 36 models have been launched. At the MODEL MASTERS OPEN at Lake Fairfax, Virginia on Sept. 15, the boat’s designer, Bill Huson, piloted his No. 125 to an effortless win, trailed by this author in a modified, flush-deck, bulk-keel version of the H36. Third place was taken by Bob Schumacher sailing a punkin seed looking |J36, while fourth was taken by another Huson 36. As you can see in the photos, the little cockleshell really looks like an ocean racer. She carries two-channel radio and a Little Herc winch with ease, weighing out in the 10 pound area with a 50% ballast ratio and medium aspect sail plan. You will notice that the detailing which has been done to No. 125 in the way of handrails and port holes does quite a bit to enhance the appearance of the boat. Inquiries should be made to Leisure Products, 6920 Braddock, Annandale, Va. 22003. The interesting overhead shot taken of the winning boat will allow us to see a couple of points with regard to sail set. Firstand most obvious, is the amount of sag to be seen in the forestay. You can see how this sag has pushed extra cloth aft in the jib, making it very cambered, and opening up the slot about midway up the slot about midway up its leach. You can just see the foot at the clew starting forward toward the tack and it must be quite bellied after it passes out of our sight judging by the angle with which the foot is leaving the clew. The mainsail would benefit by having the mainsheet taken up to reduce the a Spee va ~or x ¢) J a Elsah ‘-= OF ome Q Fa acon, SSOZOck I ws 7s a2 OO _ Fay ee – f —2s 25 S ay | parallel to the centerline of the boat, and new ownership. The point the picture makes Is again the simple concept of “Over Starting Line Early The bottom batten is not quite board of Chuck Black. This beast was 75 inches overall, and did such a number on the West Coast 12’s and Santa Barbaras, that my spies tell me the M-12 was retired from active racing after several threats on the skipper’s cradle! It now sails in the Central Texas area under The jib. spreaders. (See photo). Using a separate bow mounted forestay will give you jib shape as seen in the photo of JR 102. Hold a ruler up to the jib luff!!! And look at the wrinkles which have developed along the luff. This boat needed some firm treatment to whip it into shape, including an entire change of sails, removal of the forestay, addition of spreaders, and addition of lower 6. ese main would not be backwinded by the jenny stays are tightened, using turnOur ‘Shape of Speed Gallery” shows buckles which terminate at or near the a Monster 12 belonging to the fertile sioning the outhaul, in order that the * main foot could also be reduced by ten- * (NAY RU Rule 36) 3. The Same Tack Rule (NAYRU Ru e 37) 4. The “Buoy Room” Rule (NAY RU Ru e 42.1) 5. The “Anti-Barging’”’ Rule (NAYRU Ru e 42.1 [e]) The amount of draft in the * Rule the sail. into the drink!!! It has happened to me!! ‘‘Tacking Too Close” I’m sure that she would point a good |. deal better if that was pulled in, as will _ happen when the mainsheet is shortened. | Find a steep bank,.set your boat up at the bottom of it and then climb up | | and squint down the mast, you will be — surprised at what you see. avoid bending the mast in a backwards arc as you tighten the backstay, the 2. The * amount of twist which has developed in | But back to Figure 1. As previously mentioned in regard to jibs, the forestay needs to be maintained as taut as pos- is nothing more disconcerting that to be sible. This is to allow the jib to sit on out in front of the fleet, heading for the stay and “set” properly. In order to the finish, and see your entire rig fall tips. This is achieved one panel at a time. Brush a coat of thinned (50-50) dope on both sides of one panel. As soon as the dope is dry to the touch, weight the panel down on a flat board with a 3/16 wedge under the trailing edge at the tip. Piles of magazines make good weights. Allow it to cure at least 24 hours; 48 is better. Inspect, and if correct, repeat on the other panel. For test flying it is advisable to have an experienced RC flyer help test and trim. If none is available, use the following procedure: Range test the radio system per manufacturer’s instructions. With receiver and transmitter on, set control surfaces to neutral by adjusting the push rod clevises. Now find some benign terrain… soft sod and/or high grass, … Choose a time of zero or light wind, and hand glide the airplane. This requires a run and a Straight, slightly nose down javelin launch. When your knees have stopped shaking, analyze the test and make correc- Did you know 2/C Sailing can be highly competitive, or just plain fun? Did youknow Your present R/C equipment can be used without change? FOR THE AMYA 50/800 CLASS FOR THE AMYA 36/600 CLASS INTRODUCING! VALKYRIE TAHOE 600 36in Length Beam Length = 9 4 in Sail area Beam Height Sail area 600sqin « MOLDED PLASTIC CONSTRUCTION Displ. ® FINISHED NYLON SAILS ® COMPLETE KIT (LESS BALLAST) e FINISHED DACRON SAILS eCOMPLETE KIT (LESS BALLAST) $7475 VICTOR SAIL SYSTEM FOR MODELS WITH UP TO 600 1q in $ 2495 COLORED NYLON Salt SETS AND LEAD SHOT BALLAST AVAILABLE VICTOR MKII SAIL SYSTEM J FOR VALKYRIE SIZE MODELS Dealers welcome {AVAILABLE APPROX MAY 15) At tions to get a straight, nose-down glide. Make the adjustments at the clevises, one-half turn at a time. Do not allow your dealer or divect {rom, VICTOR MODEL PRODUCTS any trace of a stalling tendency or turn bye. as it will be exaggerated under power. When the glide is good, fire up the engine, test the control system, and if all The upper and lower shrouds terminate at the deck in turnbuckles, while the backstay usually has a bowser adjustment for greater movement and allowing a fore and aft movement of the rig for balancing the hull/rig combination, The jibstay terminates in a rack as shown last month, or at a tang or eye on ts well, have your helper give the plane the same kind of launch. If it doesn’t start to climb, give it just a touch of up… be careful, it’s more sensitive under power. Allow it to climb at about a 15 degree angle to about 75 feet, then put it into a shallow turn. Be sure to keep her upwind of your transmitter until you get familiar with her characteristics. When at a safe high altitude, set the transmitter trim levers so she will glide hands the mast near the jenny struts. (See photo). Provision is made for adjust- (especially the the boat and experiment with it by sighting down the mast, or by looking up needs to be maintained as taut as possible. This is to allow the jib to sit on the stay and ‘‘set’’ properly. In order to avoid bending the mast in a backwards arc as you tighten the backstay, the jenny stays are tightened, using turnbuckles which terminate at or near the spreaders. (See photo). Using a separate bow mounted forestay will give you jib shape as seen in the photo of JR 102. Hold a ruler up to the jib luff!!! And look at the wrinkles which have developed along the luff. This boat needed some firm treatment to whip it into shape, including an entire change of sails, removal of the forestay, addition this rigging adds wind resistance, but if you haven’t the ability to contro! the shape of your sails for maximum effi- while you are there.) Every hole you the mast with a mirror. If the mast can- put in a mast weakens it and makes it more prone to take up a shape other than a straight or smooth curve. Contrive to make your mast attachments as not be stayed absolutely die straight, chuck it and make a new one. It should be straight before any rigging is put on it anyhow. few and as far apart as possible. There PEAPOD You’ll pass by the fleet when your POWER boat is powered by CARR SAILS. With more competition wins in more A.M.Y.A. classes than any other sailmaker, we know what an important part of success sails are!!!! Act now and this MODEL BUILOER Special will allow you to suit up your PEAPOD for only $20.00, a saving of 1/3 from regular prices. Write for our off-season savings in other classes and for a copy of the 1974 brochure and price listing!!! Specify color: white, gold, red, dark biue, light blue or green. Specify main luff required: bolt-rope, dress hooks, double luff. Give AMYA boat number and choose numeral color: of spreaders, and addition of lower shrouds and a backstay! Granted, all and jenny struts. The latter are pushed through the hole drilled in the mast and bent to the proper angle. The former are installed the same way, and installed the same way, and retained by soldering some drilled out tangs to prevent athwartships movement, as well as to provide points of attachment for jenny stay turnbuckles and lower shroud holes a tight friction fit on the tubing, and after installation, flatten the tubing ends and drill holes for the rigging wire to fit through. (We use 30 pound test Steelon plastic covered leader wire for rigging. It is available in sporting goods shops in 25 foot rolls. Remember to also pick up the proper size swaging sleeves round ones) to carry Continued from page 51 ers terminations. (See photos.) Make the ment of both forestay and jib halyard to change mast rake. | prefer to cleat both to the mast, as | do not trust bowsers e But back to Figure 1. As previously mentioned in regard to jibs, the forestay 11715 Adenmoor Ave Co®f reudents Downey. Ca. 90242 tom tos” | use 3/32 OD brass tube for spread- forestay loads without slipping. | will again say that the best way to learn about your rig is to set it up on off. She’s all yours. Have fun! 14% Ibs (lassR/C) a MOLDED PLASTIC CONSTRUCTION £35 v5 pa. SAIL AREA 50 in 1 ‘y in 74 >in 80O0sq in AR® Make check or money order payabie to: black, white, red, CARR SAILS 7607 GRESHAM ST., SPRINGFIELD, VA. 22151 ciency, you can kiss the silverware good- JANUARY 1975 WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 65 is nothing more disconcerting that to be out in front of the fleet, heading for the finish, and see your entire rig fall into the drink!!! It has happened to me!! * * * Our “Shape of Speed Gallery” shows a Monster 12 belonging to the fertile board of Chuck Black. This beast was 75 inches overall, and did such a number on the West Coast 12’s and Santa Barbaras, that my spies tell me the M-12 was retired from active racing after several threats on the skipper’s cradle! It now sails in the Central Texas area under new ownership. The point the picture makes is again the simple concept of parallel leaches on main and jib. Notice that even though the main twists off quite a bit, the jib leach follows it as One proceeds up the mast. Though it is risky to make suggestions on photographs alone, | would have tried a little more tension vang to slightly reduce twist. On the other hand, front, don’t get greedy and possibly on the main the mainsail if you’re out start fiddling with everything!!! * | * recently heard * a proposal made within the hallowed halls of AMYA that would SANTA BARBARA, CA 93101 See yacgn hotby relaler ps- in oad 210 EAST ORTEGA ST. ie Fe __it CUSTOM R/C CAR COMPONENTS IN have increased the penalty for committing a foul on the race course from 2 points to 3 points. The rationale was to make the penalty more severe and in so doing, encourage people to do a better job of learning the racing rules. When asked for my opinion, | hummed and hawed and finally came to the conclusion that the point assessment had nothing whatsoever to do with the actual goal… learning the racing rules better . | suggested that maybe a continua- tion of the racing rule discussion in AMYA’s Quarterly Newsletter would help. But in addition, | think that we need a good, comprehensive reference that an individual skipper can study. Just reading the rules didn’t seem to work for me. And since the rules themselves are not arranged in the order in which you are prone to meet the situa- tions, it was hard to decide just which rules were important and which were only used sometime, HRE cuassis KIT…………..2.. $134.95 The Hallum Racing Enterprises chassis kit is now available and includes: Chassis plate, engine mount, front end assembly, rear blocks and bearings, Kydex for bumper/radio mounts/roll bar, battery and receiver hangers, steering override, throttle override, flywheel and clutch assembly (12 teeth), integral gear and brake (56 teeth), brake band and liners, front and rear wheels and tires, 1/4 inch diameter rear axle, body mounts, wing tubes and mounts, and aerodynamic wing assembly. All related hardware (aircraft quality) included. Front and rear ends fully ad- justable. All parts available separately. BODY NOT INCLUDED. i > E iy Engine mount available separately ($9.95). Fits Veco, McCoy, and Taipan engines. [=| n = Add-on performance components (new) will be seen at the 1974 Nats in San Jose. HRE Inc., P.O. Box 4658, 66 Irvine, California 92664 The answer lies in a beautiful book, INVITATION TO SAILBOAT RACING, written by the late Alan Brown and published by Simon and Schuster of New York. In Part 1, he covers the lay- out of the course, start and finish lines, and the proper manner of sailing around the course. Part II explores the 6 Basic Rules and the maneuvering which occurs at the marks. Each page is text plus diagram, and the format is almost like the programmed learning text which many of us have encountered. The 6 Basic Rules cover 90 percent of the problems which you will encounter on the course, and are as follows: 1. The Opposite Tack Rule (NAYRU Rule 36) WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! MODEL BUILDER 2. The “Tacking Too Close” Rule (NAYRU Rule 36) 3. The Same Tack Rule (NAYRU Rule 37) 4. The “Buoy Room” Rule (NAY RU Rule 42.1) 5. The “Anti-Barging” Rule (NAYRU Rule 42.1 [e]) 6, The “Over Starting Line Early” Rule (NAYRU Rule 44) As you notice from the North Amer- ican Yacht Racing Union (NAY RU) Rule numbers, the important ones are sprinkled all over the place, and some, such as No. 5, are sub-parts of other rules. Mr. Brown has done a beautiful job of providing us with the means to become knowledgeable skippers. He sets up a situation in words and a diagram, and then requires you to respond with an answer that demonstrates your grasp. After studying with him for a while you will find yourself seeing the same situations occur on your local lake. Now you are ready with the correct response for your vessel. | think any skipper without acopy of Brown’s book Is really lessening his chances on the race course, since he must not only be fast, but right, The Pattern Engine to Watch… the K&B .61R/C with Take a good look – you’ll seeing 4 lot of this engine! Allindicators point to the New K&B .61R/C as the pattern engine to watch. It is proving its worth by challenging the imports for the top places. Thus, more and more pattern flyers are switching to the New K&B .61R/C when they see and hear its amazing performance. as tactical situations develop. * * * Since we first mentioned type a few months ago, a new HUSON 36 models launched. At the MODEL Muffled against noise and engineered for performance, the New K&B .61R/C includes a specially designed muffler that does not inhibit its performance. It is rugged in construction, contemporary in design and fitted with a pressure the protonumber of have been MASTERS OPEN at Lake Fairfax, Virginia on Sept. 15, the boat’s designer, Bill Huson, piloted his No. 125 to an effortless win, trailed by this author in a modified, flush-deck, bulk-keel version of the H36. Third place was taken by Bob Schumacher sailing a punkin seed looking L.J36, while fourth was taken by another Huson 36. As you can see in the photos, the Jittle cockleshell really looks like an ocean racer. She carries two-channel tap. The engine features new improved head, piston, by-pass, port timing, rod, ring, and cylinder, plus a beefed up housing. Another big bonus for flying with the New K&B .61R/C is its quick availability of parts. radio and a Little Herc winch with ease, weighing out in the 10 pound area with a 50% ballast ratio and medium aspect sail plan. You will notice that the detailing which has been done to No. 125 in the way of handrails and port holes does quite a bit to enhance the appearance of the boat. Inquiries should be made to Leisure Products, 6920 Braddock, Annandale, Va. 22003. The interesting overhead shot taken of the winning boat will allow us to see a couple of points with regard to sail set. First and most obvious, is the amount of MUFFLER * *Sald anly with muffler aurora hobbycrafts 12152 WOODRUFF AVENUE, DOWNEY, CALIFORNIA 90241 amount of twist which has developed in of subjects over the next few months. the sail. Your thoughts are solicited too, through The amount of draft in the MODEL BUILDER, or directly to: Rod sag to be seen in the forestay, You can main foot could also be reduced by tensioning the outhaul, in order that the main would not be backwinded by the jib, The bottom batten is not quite see how this sag has pushed extra cloth parallel to the centerline of the boat, and R/C Auto… aft in the jib, making it very cambered, and opening up the slot about midway up the slot about midway up its leach. You can just see the foot at the clew starting forward toward the tack and it I’m sure that she would point a good deal better if that was pulled in, as will happen when the mainsheet is shortened. Find a steep bank, set your boat up at the bottom of it and then climb up and squint down the mast, you will be surprised at what you see. I’d like to thank the skippers who The 1/8 dia. rounded tip carbide tool and a polishing wheel will be used. On the portion just below each intake port, must be quite bellied after it passes out of our sight judging by the angle with which the foot is leaving the clew. The mainsai! would benefit by having the mainsheet taken JANUARY 1975 up to reduce the have taken the time to write to me. Their suggestions will be guiding my choice Carr, 7607 Gresham St., Springfield, Va. 22151, e Continued from page 53 the passage should be beveled inward at a rather shallow angle. Leave a slot of about 1/3 the liner thickness on the bottom of the intake port. The piston does not go down to the bottom of the intake port, so if the bevel goes all the way to the cylinder bore, the flow will WHEN CONTACTING ADVERTISERS, TELL ‘EM MODEL BUILDER SENT YOU! 67