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

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Old 12-30-2002, 02:22 AM
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SSGSPEEDMAN
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Can anyone tell me what the best engine would be for this

airplane? Besides the engine they recommend. I'm trying

to put a MVVS GRRT, NELSON QM 40, or that engine made

by WEBRA that can turn "40,000rpms"! I didn't studder yes

I said 40.000 rpms. The reason why I said the GRRT is its lighter

than the engine they recommend. But its goin to be pain in the

but to install this engine if you peoples that have one know what

I mean. Maybe I can do something to install it sideways

or something.

thanks kevin
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Old 12-31-2002, 05:30 AM
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why not try the recommended engine? it really hauls with the West 50 that comes with it. Hans
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Old 12-31-2002, 05:46 PM
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ooooooh GRRT.. should be nice, esp if you can hide the pipe in the canopy with the rear exhaust. chop the nose off, build it around the engine
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Old 01-01-2003, 02:13 AM
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Yeah I know its going to a pain trying to hide that pipe. I also

had a the same idea you were thinking.
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Old 01-01-2003, 11:23 AM
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a pain maybe, but very much worth it. i did it on a design i did and with a MDS 38 and heli pipe on a 10x6 i was keeping up with others on tunned MVVS 40s with full pipes and 9x7's ect
it cuts the drag and saves having to add weight to one tip to counter act it. it seams such a shame to have a clean plane with a dirty pipe on the side.
As far as i know the canopy is only held with a strip of covering and the designer tells me the only reason he didnt do it that way was people like to play with the pipe too much and it wouldn't be as easy if hidden. You should be able to get a swan neck manifold or re-engineer the firewall.
If you crank the engine over and have side exhaust ( is that possible on the GRRT? ) you should have no trouble getting into the canopy like mine below
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Old 01-01-2003, 01:29 PM
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man smooth looking plane. very smooth. So what would it take to get into the 180 plus speeds?

Also do you use retracts or fixed gear set up?
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Old 01-01-2003, 01:33 PM
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So what would it take to get into the 180 plus speeds?
On a Magnum with a West 50 about 20 seconds flight time
Retracts = weight, and theres no room really, Fixed is ugly and draggy, its a hand launch and belly lander
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Old 01-01-2003, 02:17 PM
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I would love to have retracts on my Magnum...

Maybe i'll look into it after i complete the AD F-117...
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Old 01-01-2003, 05:47 PM
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oh okay I did not know it was without gear. It definitely looks smooth though.
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Old 01-15-2003, 05:56 PM
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Speedman, did you ever get that GRRT fitted? i've just got a GRRT and really want to try fitting it in a Magnum.
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Old 01-16-2003, 02:13 AM
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which GRRT did you get? Also how does the carb mount on yours?
I have same engine and just curious as to how other people set theirs up.
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Old 01-16-2003, 05:07 PM
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umm not sure, its a 40 and has 51 and S on the mounting lugs, the throttle is currently a non throttle type held on with two allen bolts, i havnt yet picked up the throttle carb.
the exhaust points up slightly which should help with entry into the canopy, i may have to redo the tank area and heat srink part of the tank before the pipe does. the canopy area will also need heat protection. this is still in my head at the mo, just lost job so cant buy new stuff and Magnum just yet.
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Old 01-17-2003, 12:18 AM
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I haven't got one yet , but my dad has one on his DD.

but for starters I'm going to use my TT.46 with the performance

spec. pipe.
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Old 01-17-2003, 01:17 AM
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even with a TT.46 it will still haul around pretty fast. I tried mine out with a OS.46 FX on it 9 x 7 before and it flew pretty fast for a sport engine.

It was much faster than most of the planes at the field.
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Old 01-17-2003, 01:43 AM
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SWEET
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Old 01-17-2003, 05:36 PM
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i built something a bit like a Whiplash with a fuz a couple of years ago with the same GRRT on it for a friend. it was about 30MPH quicker than anything else on the field
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Old 01-17-2003, 08:22 PM
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I'm running a GRRT on my DD but I have no clue on how fast it is going. It moves from what the other guys say and their reactions to it. I just cant tell if its fast when flying it now. Guess i don't got used to it.

I know one guy at a club in Alabama said it looked faster than a few turbines he flown before. I'm sure the slower turbines he meant but still felt good to know that.

I have some pics of it in my gallery
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Old 01-17-2003, 08:51 PM
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Hey guys, glad I stumbled across this thread! I'm in the process of modifying my Patriot to have an upright engine w/rear exh. (MVVS .49 that I rotated the cyl. on) I've got a Macs header on order, to go w/ the pipe I got . I'm gonna make a new canopy/turtledeck outa 'glass, that ought to slicken it up aye? Somethin' different, ya know!?
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Old 01-17-2003, 09:15 PM
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sounds like its going to haul!

Post some pics when you get done
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Old 01-24-2003, 09:37 PM
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yes it does.
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Old 01-25-2003, 11:04 PM
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Default YS 45 (MACs Pipe) in Magnum

Guys I took my Magnum up today for its maiden flight using a YS 45 with Macs pipe and header turning a 10x6.

It went balistic... It pulls a vertical on 1/4 throttle and at half its like a turbo kicks in.

I'm going to go for more pitch as I want to achieve top end so i'll let you know how an 11x11 prop goes tomorrow weather permitting.
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Old 01-25-2003, 11:45 PM
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11x11 prop is kinda of the big side. To get more speed go down in diameter and up in pitch. You need to get the RPM's going as fast as possible then increase pitch for speed.

Try a 9 X 8 or 9 x 9 .. I'm not sure what that engine turns but those should give you a lot more speed.
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Old 01-27-2003, 08:47 AM
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Thanks for that info Cobra, I'll try that out this week. It was kind of strange as the 10x6 semmed to pull like mad on the ground but in the air did'nt really perform. I'll try the combination you suggested.
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Old 01-27-2003, 10:36 AM
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10" dia gives lots o thrust
6" pitch gives no more speed than any sport plane

add another 2" pitch and for every turn you'll go about 2" further forwards per rev, thats 21k every min.. thats alot of inches
you need to drop dia to do this so your launcher will have to be slightly less lazy, but only slightly less
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Old 01-27-2003, 09:01 PM
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yeah that is true about whoever launching your plane. Its going to take a little more arm than before.

The faster props really don't seem all that strong as pull wise on the ground. But in air once they start to bite the air is where you can see the speed.
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