About this Plan
Griffon. Control line sport-stunt model.
Quote: "THIS small stunt model was built to suit the AM 15 with the idea of trying to find out if the new schedule (ie the square manoeuvres) could be produced with this motor volume, and, even more interesting, with a diesel at that.
During the design work some things outside the normal run of stunt practice had to be considered due to the small size of the motor. Number one was that the flying speed would be unavoidably high. Although theoretically the 100 bhp litre AM 15 could power a 260 sq in, 36 in span model, we think the windy weather performance would not be special. So, for this occasion, we settled for 210 sq in and 32 in span. One of these days we'll enjoy making the larger model for those rare, calm days, and anticipate really good performance.
The first change made was to omit the flaps and limit elevator movement to 40 deg each way. In flight this movement is not used to the full but could, perhaps, be handy.
The other unusual thing is that wings are symmetrical, the size being too small to give any noticeable difference in lift between the two panels. We could have offset the wing 1/4 in, but we didn't bother and our guess is that you won't either.
Anyhow, the upshot was that the model most certainly will do all of the current acrobatic schedule. The speed of about 60 mph on 45 ft lines makes it a wild ride at first, but when you get used to it, flying this little 'bomb' is immense fun. Just take things easy at first and you'll have a model you can bring out in a fairly stiff wind when the bigger, slower models are a little trying on the nervous system!"
Quote: "Hi Steve, Griffon - Dave Platt’s 1.5 cc C/L stunter from Model Aircraft October 1958".
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User commentsDave Platt did all the things right that he didn't do on the Marvin. Got rid of the wing flaps, too much drag, increased the wing section, blunted the leading edge, brought the wing closer to the thrust line. Just made a great small stunt model.
Bob Taylor - 08/08/2020
I built two of Dave Platt's Griffons as a teenager some 50 years ago. 12 months ago I got back into control line and decided to make a scaled up version of the Griffon (140%) to use an OS 25LA and added flaps. As with my original Griffons (built as per the plan) the larger version flies very well on 60 feet of line. My enlarged version is shown above in the photos.
John Lewis - 13/09/2021
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