Have an almost new OS .91 FX 2 stroke...what to do with it? - RC Groups
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Nov 08, 2017, 05:33 PM
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Canada Goose's Avatar
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Have an almost new OS .91 FX 2 stroke...what to do with it?


Hi guys,

I have an almost new OS .91FX that has been broken in and about 5 flights on it......tried selling it but no takers so wondering what plane it would be good in? Any suggestions ?
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Nov 08, 2017, 06:22 PM
Mumbling in the corner.
flyboy2610's Avatar
"Have an almost new OS .91 FX 2 stroke...what to do with it?"

Send it to me! Christmas is coming, you know!
Nov 08, 2017, 06:33 PM
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Canada Goose's Avatar
......lol
Nov 08, 2017, 07:09 PM
team sleprock
whiskykid's Avatar
it is basically a supercharged .61!

they will fit in any 60 size airplane! I have 1 in a 65" P51, and a DC F18 HORNET!

and they really don't suck the fuel like you would think!

I had my first one in a GP EXTRA 300s! was the perfect combo!
Nov 08, 2017, 07:39 PM
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Canada Goose's Avatar
Some great suggestions. Direct Connection F18 Hornet that would be a complete newcomer to my conventional hangar. Who sells any prop jet kits or ARF's?

Seeing as no one makes prop jets anymore I've decided to go for a Great Planes Revolver 70"
Last edited by Canada Goose; Nov 10, 2017 at 06:26 PM.
Nov 10, 2017, 10:12 PM
Dinosaur
Twodor's Avatar
Put it on Craig's List or ebay and say that it is 'Rare' or 'Vintage' or 'Collectable' then ask about five times what you think it's worth.

Seriously, you couldn't find a better match for your engine than a Great Planes, Super Sportster. The 60 size Sportster is a sweet plane to fly. Either kit or ARF, you'll find it hard to beat.

Tom
Nov 12, 2017, 10:07 PM
Pro Bro #1963
Super Sportster .60 kit would be my pick BUT......I'm thinking it is gone again as I don't see it listed anymore.
Nov 12, 2017, 11:18 PM
AMA 537620
ChillPhatCat's Avatar
If I put it in a Super Sportster I would build a 90/120 personally... not that hard of a plane to scratch build and plans are on Outerzone.

If I had this specific problem though, right now, it would end up in the Great Planes Tomcat that I acquired earlier in the year.
Nov 15, 2017, 02:42 PM
Registered User
Any 60 size plane. I had one on a Super Chipmunk from World Models.
Nov 20, 2017, 03:12 PM
One of the Deplorables
Colt SAA's Avatar
sig 4 star 60, sig hog biplane.
Nov 20, 2017, 03:16 PM
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Canada Goose's Avatar
Both great planes, had both and loved them many years ago.
Nov 21, 2017, 02:31 AM
AMA 46133
Quote:
Originally Posted by Colt SAA
sig 4 star 60, sig hog biplane.
With a .91 two stroke those planes will be on steroid! The 4 Star 60 tail feathers may start to flutter. Both plane will need a lot of down thrust to keep them from climbing.

I would look for a larger airplane. Possible around 70 to 80 inch wing span, 900 square inches of wing area and 9 to 10 pounds or so AUW.

Something like a 120 four stroke plane will work quite well with a 91 two stroke. Depending on the desired flying style. A 60 size WW2 warbird can benefit from the added weight and power from the 91 two stroker.

The Four Star 120 may be better suited for the 91 2 stroke.
Last edited by SeismicCWave; Nov 21, 2017 at 02:38 AM.
Nov 21, 2017, 10:22 AM
Registered User
I like the 70" Revolver plan. I was flying that plane as a "go to" plane for several years, powered by a DLE 20. Actually there were 3 of them, not counting the times there was serious repairs to be done.

That plane taught me a BUNCH! It got me started on flying knife edge, which fed an itch I was getting regarding 3D. Now just possessed. Learning KE was just the tip of the iceberg......

2 tips if going that route. Look into the landing gear mod and do it while building. It's much easier when new, and if you own a Revolver, you WILL be doing the mod. The other is regarding CG. Goldberg specifies a starting CG that's WAY too far forward. You can bring it back an inch easily, and an advanced flier can double that. Don't be shy of moving servos to the rear.
Nov 21, 2017, 11:11 AM
******
I have my 91fx in a SFG U-can -do, and love it, prop it so it doesn't go fast and its great
Nov 21, 2017, 11:26 AM
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Canada Goose's Avatar
Quote:
Originally Posted by ahicks
I like the 70" Revolver plan. I was flying that plane as a "go to" plane for several years, powered by a DLE 20. Actually there were 3 of them, not counting the times there was serious repairs to be done.

That plane taught me a BUNCH! It got me started on flying knife edge, which fed an itch I was getting regarding 3D. Now just possessed. Learning KE was just the tip of the iceberg......

2 tips if going that route. Look into the landing gear mod and do it while building. It's much easier when new, and if you own a Revolver, you WILL be doing the mod. The other is regarding CG. Goldberg specifies a starting CG that's WAY too far forward. You can bring it back an inch easily, and an advanced flier can double that. Don't be shy of moving servos to the rear.
Thanks Al.....I've just ordered the Revolver 70 and plan to use it as a step up plane from my typical sport model. I have an EF 74" Edge 540 which will be gas powered so I was looking for a plane that would be a good transition into it. I'll get some balsa triangle stock along with 30 minute epoxy to beef up the landing gear mount. Flying season is over here so I'll take my time to build it slowly and right.


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