Ambroid did the A-1 towline, the Jetstream. The Top Kick was by Jetco. I still have one each of those kits and flew them in the 60/70 era.
Ty,
You are right. There seems to be some fading brain cells.
Now, this part is right. I looked it up in my files. The Jetstream was designed by Warren Kurth (of 1/2A Speed fame) and the Top Kick was done by Reid Simpson (of Simpson twin fame).
The Jetstream was published in the Nov 60 issue of American Modeler. The Top Kick was in the Sep 62 issue of Model Airplane News.
I know this thread is about the Don Still Stuka, but this other stuff is interesting too.
So, I will get back on track to the Stuka. The plans published in the Apr 52 issue of Air Trails showed the engine was a "Fox 29". The article stated "Products found most suited to his ship are: Fox .29, Top-Flite prop 9.6..." As has already been explained, the Fox 25 had not yet been invented.
From the plans in Air Trails, the nose from wing LE to prop driver is slightly more than 6 1/2 inches. The Aeromodeller plans (Jan 61) which represented his Stuka that was flown to second place and led the US team to first place at the 1960 World Championships had a nose 8 3/16 inches. By what was published in that Aeromodeller article, this is the version that was going to put into the Ambroid kit. According to that article, "...the design originated in 1950 and has been changed only in detail and length of nose." Also, according to that article, the 1960 version used the Fox 25 instead of the Fox 29 used in the original.
Technically, I would think that the 1960 version (which probably is the Ambroid version) is not OTS legal because of its increased nose length. However, I think the Ambroid version has been allowed whenever it appears in an OTS contest. I am not sure what version the RSM kit represents which has also been allowed in any OTS contest I am familiar with. I will see Eric rule this weekend. (He is staying at my house for our Southwestern Regionals and I will ask him about it.)
Keith Trostle