Fancy Pants engine?

Would a good .19 be enough power for a Brodak Fancy Pants?

Define good. An OS .20FP will do the job. But an older Fox or McCoy .19 (might) not and it does depend on how heavy the model is.
Well, that is one opinion, other to follow.

Depends on the Fancy Pants, the engine brand, and engine condition.

>Would a good .19 be enough power for a Brodak Fancy Pants?

Not all .19's were close to being equal in power output. Both the Fox and the K&B produced their best results at fairly high rpm's for their own era. The Fox would do a 4-2-4 quite happily, but didn't offer much total power that way compared to running with a seriously lean setting.

Something similar could be said about the plane. The original kits of the Fancy Pants contained wood selections that varied more widely than we've gotten used to being Brodak's standard. Some old ones probably weighed over 45 Ounces with a 19 mounted. That would be a rather high wing loading and would need high air speed.

The strongest engine in that size in the old days was the Veco; GMA claimed that the series 100 19 was stronger than the K&B in all ways. I never had that model Veco 19, but my Series 200's have definitely been the most powerful for that size in a baffle piston engine that I personally have experience with.

Several PUNY 19's were sold back in the 50's. None were optimized to deal with adding mufflers, and all suffer a lot of power loss from using those. The Testors McCoy 19 was generally somewhere in the middle (and it's my opinion that the quality was less variable in that size than the 29/35 was). It probably would struggle with any Fancy Pants that wasn't a very light, very straight model (for the sake of simplicity, I'm going to say it should weigh 38 Ounces or less, but that's simply a WAG).

If you don't go overboard on finish, detail, don't use Koverall, avoid excessive use of epoxy glue, etc. it would be my opinion you could build a Fancy Pants lighter than a stock Skyray 35 is likely to finish up at, say the low 30-Ounces range. It has more wing area than any of the sport profile models in its class, so it can carry more weight.

I hope this has given you some useful information.

.

Kiwi

Simple answer is no, a .19 sized engine will not make it a good flying plane. However, a OS 25 FP/LA would be a great combo!

...well, actually I was thinking of a Brodak FP kit with a pretty minimal finish and a box stock OS20FP with stock muffler. I understand more power (and less weight!) is available with a tongue muffler but in my case the sound is a big factor.

I have built three of them; and rebuilt two of them several times.

From the brodak kit, using Sigment and covering with silk, I got a 34 oz plane. I used several different engines on it, and the best was the OS .25. I nevr tried my .19 (a k&b Greenhead).

My latest one weighs 31 oz and is covered with silk. I changed from 2.5" DuBro wheels to Dave Brown foamies.

I have exchanded the OS .25 with the OS .20 and don't see a big difference in power. I'm sure if the plane is less than 35 oz, the OS .20 is adequate.

If you build the kit, I suggest that you replace the two individual landing gear mount beams with a single beam that cresses the center of the plane. Otherwise, the slight impact of hitting one wheel hard can break the wing in half. With a single beam, I've bent one wheel back until it penetrated the wing and still didn't break the wing.

Rex

>I have built three of them; and rebuilt two of them several
>times.
>
>From the brodak kit, using Sigment and covering with silk, I
>got a 34 oz plane. I used several different engines on it,
>and the best was the OS .25. I never tried my .19 (a k&b
>Greenhead).
>
>My latest one weighs 31 oz and is covered with silk. I
>changed from 2.5" DuBro wheels to Dave Brown foamies.
>
>I have exchanded the OS .25 with the OS .20 and don't see a
>big difference in power. I'm sure if the plane is less than
>35 oz, the OS .20 is adequate.
>
>If you build the kit, I suggest that you replace the two
>individual landing gear mount beams with a single beam that
>crosses the center of the plane. Otherwise, the slight
>impact of hitting one wheel hard can break the wing in
>half. With a single beam, I've bent one wheel back until it
>penetrated the wing and still didn't break the wing.
>
>Rex

I used a bone stock Fox .35 and it was awesome!

But, I build on the medium/heavy side so...

One was built with an Oliver Tiger Major here in the Uk and was the subject of an article in one of the mags...

Well,

In answer to the original question. The only .19 that could possibly have enough power for the Fancy Pants to perform an adequate pattern would be the Veco .19BB. They are just shy of the FP .20 in power so if you have one of those animals go for it. If not stick to a 20-25 FP or Fox .29 or .35, OS .30 -.35 with a couple of gaskets in the head of the .35. All those would work quite well, as well as the newer OS .25LA.

I hope to build mines one day. I have an OS 29 Twin Stack ready for it. But if the value of a bid keeps getting higher I will sell it and stick a Fox 29 on the nose. Everyone says the sound of a OS Twin stack is cool. Or so I am told since I can't hear a thing past 30 feet.

Jay: I had a Twinstack on my Pants, early on. Yes, they sound cool.

Not a whole lot of power, though. Run it in a two stroke.