Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

WHat is the best speed engine in the 90 class

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Old 06-03-2003, 12:27 PM
  #1  
Ragz
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Default WHat is the best speed engine in the 90 class

Until recently I was flying my GP phantom with a 91fx and a 13x8 apc prop. The speed was very marginal. I just sold the os91fx and now I want a replacement. What are the guys using for speed on a 91 class airplane. The ones I have heard of are Jett Engineering, Rossi, Webra, other than the regular OS, TT, etc.

I want to buy an engine that will really put life in a 12lbs lead weight phantom. In the future this engine may also sit in a 3d aerobat and I reckon it would perform well there too.

Any advice is appreiciated.

thanks,
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Old 06-03-2003, 12:49 PM
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Flyboy Dave
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Default Ragz....

....a twelve pounder.... ....that's a load....

....I'm thinkin' more like a big block....the OS 1.08 FSR
will put put the ponies, and pull some prop....

The Jett .90 swings an 11-8 prop....The Rossi a bit
more....like an 11-10....an OS .90 FSR might be good'
if you could get your hands on one....

....but at 12 lbs.....I'm thinkin'...."BIG BLOCK" !!!
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Old 06-03-2003, 12:52 PM
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Default WHat is the best speed engine in the 90 class

u are right flyboy, but i have a prop size limitation...the 13x8 is also seems like it will touch the grnd on a hard landing. The 1.08fsr will surely run a larger maybe longer prop....i am looking at a rossi/jett class engine...let me look for one. Any idea how much they cost?
thanks
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Old 06-03-2003, 01:13 PM
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Default WHat is the best speed engine in the 90 class

Right....the 1.08 needs alot of prop....13 or 14....

www.jettengineering.com
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Old 06-03-2003, 11:17 PM
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Default WHat is the best speed engine in the 90 class

Lol... big block engines...hehe

You've got a problem there Ragz: If you want real speed you're gonna need an engine that revs... in the .90 class that brings you to the ducted fan engines really fast...
You could also modify a stock .90 like the Rossi, but that's easier said than done, so you're better off buying an engine that is already tuned (meaning: a DF engine) in my opinion.

On the other hand, if you want an engine for a 3D type plane, you need something that is reliable, runs cool and has loads of bottom end power... exactly the things you won't find in a high revving engine...

So in my humble opinion you're going to have to make a choice between one of the two engine types, or just think long and hard, dig out the credit card and buy both engines
My choice would be the latter...
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Old 06-03-2003, 11:37 PM
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Default Something like this ?

....if RPM is the name of the game....
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Old 06-03-2003, 11:43 PM
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Default But on the other hand....

....HORSE POWER is a good idea....

....like the .91 Rossi....Stump Puller Series....
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Old 06-04-2003, 05:20 AM
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Default Having thought it over....

....you wanted the motor to fill two roles....

....the correct answer is....The OS .90 FSR....
....(but you gotta snag one off e-Bay).....

....There are many reasons I say this....It is only my
opinion....you will get others....

The Jett .90 is probably the Premere .90 made today....
but only because the others are out of production....
the small prop recommendation (11-8), and the rpm
will not lend itself towards the dual-purpose role....

The Rossi .90 is certainly the "Brute" of the lot....
when it comes to HP.....but they run a HUGE pipe,
to get everything out of it....they have the "in flight
mixture control"....which is good....but they are hard
to come by....will not lend themselves to the double
duty....and you can forget about parts....

The OS .90 fan-motor is a real sweety....but the dual
role thing is out the window again....the mounting thing
comes into play....in that being a strict rear pipe motor,
inverted mounting is out....because of the nose-wheel.
I don't know if a side-mount would work....if the pipe
would clear the wing.... :stupid:

The 1.08 OS FSR....heavy....brutal....too much for most
to deal with....

My final answer is....the OS .90 FSR....side mounted, of
course.....has the regular muffler....can use a 12" prop.
Dual purpose....YEAH BABY....!!!

Dave.
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Old 06-04-2003, 05:57 AM
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Default WHat is the best speed engine in the 90 class

ok, lets throw the 3d power plant of the window and talk of speed only. Rossi? the 91fx sucked in this plane.
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Old 06-05-2003, 08:12 AM
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Flyboy Dave
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Default Good idea....

....3D and propjets don't mix too well....

Take yer' pick....the Jett .90 is a sure bet....small pipe,
small prop, and a real cranker....or the Rossi .

I'm gonna get a new Magnum .91 XLS muffler (high
volume) and modify it to fit the Rossi....just fer' kicks
and see what it will do....

The .91 FX is a dog.
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Old 06-05-2003, 10:51 AM
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Default WHat is the best speed engine in the 90 class

Anurag,

Try a 12x12 prop on the 91FX before you toss it. I set up the same plane for a local guy with that engine. The engine has tons of torque and does not like to rev. The plane itself has tons of drag and wont be extreme no matter what you do, short of a redesign. With the higher pitched props you will need a longer takeoff roll and you will need to fly it like a jet to keep from losing speed in the turns.

Mark
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Old 06-05-2003, 11:50 AM
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Default WHat is the best speed engine in the 90 class

what about the Super tigre 90 ? or webra engines ?

SJ.
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Old 06-07-2003, 11:01 PM
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Default WHat is the best speed engine in the 90 class

And speaking about the Webra .91, what prop would you recommend starting with Dave?
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Old 06-08-2003, 02:40 AM
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Default The GP phantom ....

....at 12 pounds....

....not knowing if it is muffled, or piped....
....the % of nitro....or the blend....
....the altitude....
....the "rated rpm's"....and the expected rpm's....
....one shot....one guess....one prop....

....stick a 12-8 Zinger on it, and see what you got.
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