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

airplane for this engine

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Old 10-08-2009, 11:22 AM
  #1  
gsalort1978
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Default airplane for this engine

Hello people

A friend gave me this used engine. Anybody can recomend me a fast plane for it?

Thanks.

Gabriel.
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Old 10-08-2009, 12:06 PM
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MJD
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Default RE: airplane for this engine

Go to Matney Models' website, and look at the Quarter Midget (.15) airframes, 3 to choose from. They are perfect for a hot RE .25 and they already go 125 with a hot .15. Lots of wing, crazy people have stuck .50's in them. These are short kits, foam cores and a nice glass fuse, but there's not much to these models anyways. Think about CF props in the 7x6 - 7x7 range and running at ducted fan rpm as it is made for and you have a smoking combo. Technically APC 7" props are good for it by the 190k/diameter in inches rule, but I'm not keen on it.

Got a pipe and header for it? If not see Macs Products.

MJD

p.s. where can I get a friend like that? [&o]
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Old 10-08-2009, 01:34 PM
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Default RE: airplane for this engine

Gabriel,

I would suggest that you first dissamble the engine and look inside what is the
condition especially of the conecting rod heads. What I mean is that those
engines have very(!) short life due to the extreme high rpm and thus heat
and there could be many reasons for you to not look for any model...
I had pretty bad experience with old 10cc OS max. I had to replace
connecting rod and crankshaft to get it working and the result was
pretty poor. But hopefully you are more lucky than me.

Cheers,
Nick
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Old 10-08-2009, 01:35 PM
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gsalort1978
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Default RE: airplane for this engine

Thank you!
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Old 10-08-2009, 02:34 PM
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Default RE: airplane for this engine

I have one in a DD with a pipe on it, good for 100~110mph.
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Old 10-08-2009, 04:18 PM
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Default RE: airplane for this engine

I have one in my shrike 10, and its pretty fun, goes real good. I ended up with a trimmed down APC 7x6 to a 6.25x6 and I was geeting 24000 rpm's on the ground.
Check out thread on it.
http://www.rcuniverse.com/forum/m_9034206/tm.htm
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Old 10-10-2009, 07:27 AM
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Default RE: airplane for this engine

Is it a VF DF or a VF ABC engine, the way to tell is to take off the backplate and see if it says" 25 DF " on the back of the crank, and a "2CB" carb, the VF abc has different exhaust timing for about 18000 peak rpm, more of a pattern engine built for prop use, the DF is set up to run at about 24000 for fan use so if you want to prop it you'll want to prop it to run up to at least 23000.
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