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

Prop Choice for a Rossi 45/ Tigershark F20

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Old 02-28-2009, 10:41 PM
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Rocketman612
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Default Prop Choice for a Rossi 45/ Tigershark F20

I picked up a Sportsman Aviation/ Global F20 with a Rossi 45/ Tuned pipe setup. The engine may have been run once on the ground. It has a Master Airscrew 10x6 prop on it but I want some SPEED out of this combo.

So please give my your best choices for:

Prop
Fuel
Glow plug

Have 10% Omega for some break in flights with switch to Cool Power.

Thinking 9 in APC prop with at least a 7 pitch should get her about 100 mph. 9x8 close to 120 mph.


Thanks,
Pete
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Old 03-01-2009, 03:15 AM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Opposed to what other people will say I would use a 10x7 APC .

5 or 10 % nitro ( but with some castor oil )
and 6 Rossi Plug.

Do you have a pic of the bird ???
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Old 03-01-2009, 12:04 PM
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MJD
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20


ORIGINAL: SpeedBoy

Opposed to what other people will say I would use a 10x7 APC .

5 or 10 % nitro ( but with some castor oil )
and 6 Rossi Plug.

Do you have a pic of the bird ???
I wouldn't disagree on the 10-7, it could be one of those cases (and would not be the first) where the disc area factor of the 10" prop is more important than the pitch speed of the 9" and ends up flying faster.

If it turned out not to be the case my next guess would be a 9-8.

Ditto the rest.

MJD
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Old 03-01-2009, 09:31 PM
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Rocketman612
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Adding those items to my "Perry List" Friday is almost here

Will post some photo's and results using both the APC 9x8 and 10x7 prop.

I really can't be disappointed as I got the never flown combo including servos and Rx for $100[8D]


Thanks,

Pete
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Old 03-01-2009, 09:51 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

You got a heck of a deal!
I ran mine with 9X7 - 9X8 most of the time. One thing to have blistered on your mind when you go for maiden. Keep speed while turning. When these get slow they drop fast and will totally drop the wing if you aren't mmmoooving.
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Old 03-02-2009, 06:57 AM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Vicman,

Thanks for the flying tips. Will keep that in mind on Maiden.

Pete
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Old 03-02-2009, 08:40 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Mine ended up good all round with a 9-3/4 x 7 ( trimmed APC 10x7) VF46 Piped in my DC F20. Mine wasn't as fast as I hoped so the next one I built a slippery fuse and use a ARF wing, much faster, Hyper 50 piped. captb
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Old 03-02-2009, 09:57 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Captb,
I really like the slippery fuse idea. Did you go ahead and do retracts too?
What did you base your fuse on? I have two of the F-20 wings that I think could be used in an airframe like yours.

Most of the F-20s I've had (4) weren't the fastest things out there in true speed, about 110 by radar, but definately looked cool in flight. To get real fast I went with a Q500 airframe. They don't look as pretty in the air as the F-20 or even the Magnum. The magnum looks pretty decent and is very fast but the noise of the air going around it is erie and adds three gold stars to the cool factor.[8D]
I'm slowly getting an F-1 Rivets togeather for my speed rally this summer. Maybe I'll beat Evan this year He is a true speed king.
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Old 03-03-2009, 03:23 AM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Here's some more all scratch builds, the larger one I'm building has a new OS VRDF 77 in the front. Foam/balsa sheeted wings, the 46 size ones are a little faster than the one with the F20 wing, fuse is just 1/4 planks, triangle stock inside where they join to allow carving and sanding to a rounded shape, no formers, just a firewall and carve and shape, cost maybe $15, old school very strong. If you want some demensions let me know. No retracts after initial flights I install (pylon) pizza cutter wheels, noisy but low drag. My fastest Quickee was a Matney Models Zoomer (animal 500) with a clipped wing that was pretty fast with a blueprinted OS VRP40 running a OPS 60 carb. captb
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Old 03-03-2009, 06:52 AM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

captb

Nice job. Will try a 9.75 too.

Expecting to get about 110mph or so out of her with no retracts, only a big engine upgrade would do better. Will still be the 2n or 3rd fasted plane flying at our field. [8D]


Pete
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Old 03-03-2009, 12:40 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Sealing the hinge line ail/elev gaps helps and is easy, derma tape or similar works well. My F20 would bleed air speed fast if you pulled the nose up on approach especially dead stick. Flush mounting servos and low drag wheels help alot allso.
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Old 03-22-2009, 07:12 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Judgment Day


Got everything sorted out with the F-20 except the CG. (way nose heavy) but took her to the field to run the Rossi 45

Temp low 70's

10% omega

Nova Rossi P5 glow plug

APC 9x7 = 15,800 rpm

APC 9x8 = 15,700 rpm

Didn't get to try the 10x7 APC.

That should get close to 120 when she unloads in the air [8D]


Pete
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Old 03-31-2009, 06:43 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Maiden Flight report!!


Plane balanced at 5.5 in (front of range) with 3oz lead in the tail cone. Placed the 700mah battery in the space between the servo tray and horizontal stab (tight fit but it was doable with a piece of lite ply over the battery it allowed the elevator pushrod free movement) Final weight 6lb 11oz (weight range 5lb to 6lb 8oz)


This plane is a keeper. Very smooth, tracks great. Landing no problem just have to bleed off speed and she settles right in. Set up on suggested throws but will increase a little. The Rossi 45 ran well but the speed isn't there yet and with the pipe and fixed gear drag I may not get much more out of this combo. Have an APC 8x9 prop to try next.

But for $100.00 I'll follow my friend KC's advice and fly it till the wheels come off


Pete
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Old 03-31-2009, 08:03 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

With what prop did you maiden it ???

Did you tuned the pipe with that prop ???



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Old 03-31-2009, 08:49 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

used the APC 9x8. Was turning 15,800 on the ground. Gets on pipe with no problem. The low end was a little rich on maiden and we leaned it out with good transition on the other flights.

Pete
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Old 04-01-2009, 12:38 AM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Keep cut'n the pipe then. 15.8K is not a great number for that combo. My Rossi-45 turned a bit better than that with the stock mini-pipe. I am confident that you can get another 500rpm's out of it...easily!
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Old 04-01-2009, 02:01 AM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Thanks Rocketman ....

I have flown this airframe with Rossis 45 and jetts 50 and in both cases the faster speeds were reached with 10" props at least this was my case.

In my opinion I dont think the 8x9 will work better on that airframe , too much drag to overcome for a 8" prop ( but I can be wrong ).

I would use a 10x7 apc before cut the header and see how it behaves once in the air as that prop will generate more load to the engine, the RPM will goes down but as MJD said , the disc area could be more important than the pitch speed , if the speed doesn't raise , then tuned the header with the prop you feel faster. The header seems a bit too long in my opinion.

Oh , and if I were you I wont use the silicone tube that you have on the exhaust of the pipe , that could take some RPM down .

BTW . very nice place to fly .
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Old 04-01-2009, 05:51 AM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

Thanks for the tips. Will try the 10x7 too if not better then work on the header length.

Our club uses the Army helicopter training stagefields to fly ( Ft Rucker ) very nice and wide open. Just not a forgiving surface on hard landings.

Pete

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Old 04-01-2009, 07:25 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

The prop size also depends on the weight of the plane. Your plane weight is 6lb 11 oz you should run a 10X7 prop with your 45 engine
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Old 04-01-2009, 08:43 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

I'm glad it all went well! They are cool planes to fly. I used a battery extension on mine and put an 1100mah Nimh all the way in the back of the tail against the wall to cut down on how much lead I put in.

If you get 120 out of a dive yer doin pretty good. [8D]
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Old 04-01-2009, 09:18 PM
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Default RE: Prop Choice for a Rossi 45/ Tigershark F20

My bad, definitely try the 10" before modifying the header...

Keep us posted an have fun!
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