About this Plan
Schoolmaster. Radio control sport trainer, designed by Ken Willard and published in Aeromodeller.
Quote: "A 39in radio control sportster for .8 - 1.5cc produced with the co-operation of Top Flite Models Inc.
FOR MORE YEARS than we care to remember, Ken Willard has been continual leader among designers of radio control models to suit ompound escapements.
Well-known for his small designs, notably Gasser (oz1202) , Roaring 20 (oz1429), Rascal and Schoolboy (oz1030), which have been kitted by Top Flite Models in the USA, Ken was also the designer of the Gasser (oz1202), a fast 40 in shoulder wing design for 1.5 to 2.5 cc engines, which is in APS as drawing RC/744, price 6/6d.
Just as he has always managed to anticipate the demands of single channel sport flyers over the years, Ken produced Schoolmaster for Top Flite Models just over a year ago, and it was an immediate resounding success. We are very pleased to have been able to negotiate permission to include such a fine design in our Plans Service with the full co-operation of the designer and Top Flite Models.
Schoolmaster is 39 in. span and designed for .8 cc glow plug engines. Certainly it can accept larger capacity engines, but the charm of the design is that it will perform at reasonable speed, is very docile to control for the absolute novice and above all, is extremely robust with its all sheet construction. A word of warning here: Be careful to select lightweight soft sheet for the wing construction in order not to build up the weight too much. Normal flying weight with equipment should be in the region of 19 oz. In our experience, it is advisable to cover the sheeted wing with tissue to bond the surface. This is a tip we would advise to all who make the model from the kit.
Incidentally, Top Flite Models are now distributed by Messrs Ripmax, and Schoolmaster retails at 65/-. The kit is really first class production, with all parts die-cut, metal and nylon fittings supplied shaped, with top grade wood for the airframe, and a fine booklet on how to fly radio control models especially written by Ken Willard.
Although we have presented the model with amendments to suit British equipment, notably the new Elmic Compact escapement, we should also point out that the kit plan includes information on how to fit four or six channel multi control using small servos, or alternatively, proportional rudder. The versatility of Schoolmaster will make it a standard recommendation for many years to come, and we look forward to seeing a lot of them on the local fields in the coming season.
Commence construction by cutting fuselage sides from 1/16 x 4 in wide med hard sheet and cementing 3/16 in sq uprights and 1/4 x 3/8 in bearers in position..."
This seems to be a faithfully enlarged, hand drawn plan scaled up from the Aeromodeller article published in Jan 1965. All formers are included.
Direct submission to Outerzone.
Supplementary file notes
Article pages, text and pics, thanks to hogal. Also, a CAD-redrawn version of the plan, again thanks to hogal, posted on RCGroups at http://www.rcgroups.com/forums/showpost.php?p=34241817&postcount=14969
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User commentsMy flying buddy Harald and I are well progressed with the build of two Schoolmasters. We are using the original Top Flite plan for the "Mark 1" which is not easy to come by, so this enhanced version of the Aeromodeller Mark 1 plan is a great addition. I was just about to do a full drawing of the tailpane, of which only one side is shown on my plan, so you have saved me a bit of work! We are building the version with the optional two wheel undercarriage shown on the Top Flite plan (but not on the Aeromodeller one). It was very tempting to add a wing spar, but we both resisted. Now that both our wings are built, it's clear that the bending stiffness of the wing comes from the curved upper surface which resists being bent in two directions. We mail ordered very light stock, which is more than adequate. Each finished wing came out at a pleasing 107 - 110g. We are building the models with brushless motors. We chose the FC 28-12 1534kV on a Gemfan 7x5 and 3S1300 which gives the same power as the 1960's OS PET 099. I will send you some photos when we get done. Best regards!
ChrisPinn - 14/03/2016
The first of the two Schoolmasters has flown - mine [more pics 003-005]. Harald's is a week or so away from completion. Final weight ready to go with battery 575g. I chose a minimalistic finish to save weight (8g dope + 3g decals). This is a very sweet flying model which only needs small rudder and elevator deflections. I had to throttle the motor way back as she flies around quite happily at only 4.2A. I therefore reduced battery capacity to a 3s1000 from the planned 3S1300. Hats off to Ken Willard for this one.
ChrisPinn - 21/04/2016
It was the first flight of Harald's Schoolmaster yesterday. Even more minimalistic than mine as it has no decals at all [more pics 006, 007]! He is using a 2s1500 which gives perfect power with the motor and prop I mentioned. Mine with the 3s is reined back to 60% using the DX7's ''throttle curve'' feature. Again a perfect maiden flight not needing any trim changes. We can both highly recommend this model.
ChrisPinn - 22/04/2016
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