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

1/2A or .10 Shrike for MVVS .15?

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Old 05-29-2007, 01:33 PM
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AllTheGoodNamesAreTaken
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Default 1/2A or .10 Shrike for MVVS .15?

I think I might like a Shrike and want to know if the 1/2a or the .10 would be better for the .15? The little MVVS spins a 7x4 APC at 19K.
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Old 05-29-2007, 01:58 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

You need to go with the 10 size for that motor!
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Old 05-29-2007, 02:16 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

I can't speak first hand about the Shrikes. What I can tell you is that if you use HS 65 servos, 300 mah nimh battery, Berg RX, 2 oz tank, and a 6.5 oz engine, it is possible to come up with a RTF plane that weighs in the low 20 oz range. Base your wing loading on that. I'll bet a 1/2A Shrike can accomodate that much weight, but the better all around flyer will still be the .10 sized bird. I just finished building a similar setup, but with a fat wing and it is a blast.
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Old 05-29-2007, 02:32 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

The .10 makes the most sense to me, but some of you guys are stuffing .32's in the nose.
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Old 05-29-2007, 04:00 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

Hey CP...that thing's cool! Whadoya callit?
Looks a bit like a C/L combat job [8D]
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Old 05-29-2007, 05:06 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

Thanks, PT. You're right, I built it out of some old C/L combat prefab parts laying around, this basic wing usually carries a FOX .36 Combat Special. It isn't fast, but it is very quick. Next move is to install a servo that steers the engine.
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Old 05-29-2007, 06:09 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

I was/am going to stuff an MVVS .15 in a 1/2A Shrike... I did the math, like CP just did, and IMO it is perfectly possible. You don't even need a throttle servo...

Don't forget they also list that plane for Speed 400 power... do the math with a big chunk of battery and a Speed 400 motor upfront... I bet it will come out heavier than an MVVS .15 powered plane, and it will only have half the power of a glow .15. So if that flies, then a .15 powered plane will certainly fly.

So go for it.

I really need to finish mine... should be a blast. My little MVVS is ready: turning a 5.5x5.5 at 25800 rpm rich... that should haul the mail

Talking about props: you don't need a 7" blade for a plane that size. The MVVS should have no trouble with something like a 6x6, if you want to keep it at about 19000rpm. A little more pitch might give you a little more speed.
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Old 05-29-2007, 06:45 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

Rudeboy, that sounds like a killer set up. My .15 sized speed attempts have all been disappointing, they sound like they're doing 140, but actually only doing about 90........if that.
I have only messed with the OS CV .15, ST .15 and Taipan .15. I have been thinking about treating myself to a Cyclon next year. Those engines are a good investment because they are hard to blow up or wear out.
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Old 05-29-2007, 08:21 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

Talking about MVVS engines: if I have to believe the Dutch importer of these little gems, MVVS has discontinued production of their small engines (.12 to .21)
Time to start buying up some stock!!
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Old 05-30-2007, 09:55 AM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

Rudeboy,
Be prepared to add weight with a .15 because it will be very nose heavy. I built a 1/2 Shrike with a .8 oz Littte Screamers park jet motor. With a 3 cell 1320 lipo, AUW is 11.2 oz and is pefectly balanced with the battery in the center of the fuse. There is very little room in the 1/2 size to move things around. With a 2 oz motor, i would have had to add weight to the tail.
Let us know how it goes.
BTW, the 1/2a Shrike with the LS motor and a 4.75x5.5 prop is more of a "pucker" airplane the a .10 Shirke with an O.S .32.

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Old 05-30-2007, 10:58 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

Well, I was going to modify the fuselage anyway, to accomodate the straight RE tuned pipe and the bigger than "normal" engine... I have the fuse sides cut: gave it a little more belly to keep the engine on centerline, and have ability to fit a 2oz tank. I also shortened the nose a bit.

You're flying lipo's... back when the Shrike was designed, lipo's didn't even exist. You were supposed to fit a 6 or 7 cell nicad pack in there back in those days... what would that do to your balance...?

I agree though, the smaller the plane, the better the thrill: it may only do 100, but it looks and feels like 200!!!
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Old 05-30-2007, 11:52 PM
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Default RE: 1/2A or .10 Shrike for MVVS .15?

Off subject question.

Combat pig, what ever became of your speed plane project with input from the German Speed guy?
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