Choice of Engine

[CRAIG HOLLIER]

I… not being a man of much knowledge of engines..what engines would be of choice that could be used in both classic and nostalgia …in the A or B class? And that is pretty easy to obtain.

Just a thought!

[Dean McGinnes]

Well, Craig, you have posed a quandry!

A good Nos Gas engine would be a puny Classic engine. A good Classic engine would be illegal for Nos Gas.

There is too great a technology gap between the periods. 🙁

My OS MAX .19 which is a very strong Nos Gas engine can’t hold a candle to my Nelson or K & B 3.25!!!

Of course, you can size the model smaller, but Nos Gas rules the airplane to weigh at least 100 oz. per cu. in. which means a .19 airplane must weigh at least 19 oz. In order to climb with a typical Class A Classic which is around 500 square inches, your combo airplane with the OS .10 would be down below 400 squares. It would climb like a rocket, and glide the same. 🙁

Also, Nos Gas structures were a bit flimsy. CF can do a lot and so can double covering with Mylar & Japanese tissue, but flutter will be always waiting to get you as soon as the nose gets down. It may also be difficult to “tame” a really big engine on a small airframe!!

There is no substitute for an airframe/engine combo designed for the job at hand. 🙂

I started with Nos Gas because I had no desire to fiddle with VIT, bunt, etc. I am now slowly moving into Classic. I think Classic will be the salvation of Gas Free Flight as AMA Gas is slowly going the route of the long-wing-bunter semi FAI. 🙁

[DAN BERRY]

I’ve gotta agree with Dean. Any NosGas legal engine on a legal NosGas design will be at a disadvantage against a serious Classic Gas effort.
It would be possible to build a smaller, better structured plane for Classic and switch or duplicate Nos engines, but then it would only be a small step to get a more powerful engine for the Classic entry.
A conondrum for sure.
That said, —OS 29 , Fox 19/201 for AB, OS 19 or 15.
Supre Tigre c35-good luck finding one!

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