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

Sunday noon Revver sounds

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Old 01-14-2007, 08:42 AM
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Rudeboy
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Default Sunday noon Revver sounds

Here's what the neighbours of a speed freak have to put up with on a beautiful sunday noon...

I have been messing around with a little MVVS 15 the past few weeks, to see how far I can push it. Below are a couple of small video files so you can hear the progress. I'm now up to 26.3K peak, and about 25.8K flight setting. Finding peak means blowing a plug as it is now. It's still easy on plugs though if I keep it on the rich side. Perhaps a colder plug might last a wee bit longer, but small engines don't like cold plugs.

Anyway, I feel there's still a bit more in it, so I'm going to fiddle around with it a little more.

http://users.pandora.be/my_rc_world/IMAG0010.ASF
http://users.pandora.be/my_rc_world/IMAG0049.ASF
http://users.pandora.be/my_rc_world/IMAG0050.ASF

Sounds quite healthy, doesn't it.
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Old 01-14-2007, 10:18 AM
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soarrich
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Default RE: Sunday noon Revver sounds

I'd be pissed if I was your neighbour, that dog barking is just too much!
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Old 01-14-2007, 10:42 AM
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Default RE: Sunday noon Revver sounds

Hello Rudeboy,

that’s a nice performance for this cheapy MVVS engine. Do you run a prop size of 5.5x5.5? If so, these are very good rpms numbers. I guess you have changed the timings, the venturi bore diameter and increased compression, haven’t you?
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Old 01-14-2007, 01:27 PM
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Rudeboy
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Default RE: Sunday noon Revver sounds

Indeed, at the moment I'm running an APC 6.5x5.5 cut down to 5.5x5.5

Intake and exhaust timing, induction timing, compression, transfer channels, crank, piston, rod and venturi have been altered.

Some work on the top end may still improve things.

Ah yes, I forgot: I'm still running FAI fuel at the moment


The dog isn't ours... it belongs to the neighbours... this is my revenge Just kidding, they are often more curious about what I'm doing than pissed off. And I don't test engines all the time.
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Old 01-14-2007, 01:54 PM
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Kmot
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Default RE: Sunday noon Revver sounds

Yes, that could raise the dead alright! [X(]

You don't wear a noise attenuator?
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Old 01-14-2007, 03:15 PM
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Default RE: Sunday noon Revver sounds

25k on that prop size is pretty close to what a Nelson .15 would run with a open short pipe.
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Old 01-14-2007, 05:02 PM
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Default RE: Sunday noon Revver sounds

Cool Rudeboy
What are your plans for this engine ? Any idea of the airframe ? Maybe a Micro Jet (http://www.modelairplanenews.com/ma/plan/microjet.asp) ?
(I have singing ears for life, take care !).
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Old 01-14-2007, 06:07 PM
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evan-RCU
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Default RE: Sunday noon Revver sounds

Cool, my latest project......

Electric, 4.2x4 carbon prop. 42,000rpm.... STATIC!!!!
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Old 01-15-2007, 10:36 AM
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Default RE: Sunday noon Revver sounds

Evan, Very nice!
My neighbor came over and told me how good my engine sounded one day even commented on how loud it was while he was in his basement. Then another one showed up with a copy of the hood restrictions listing model airplane engines[X(]. Didn't see that one when I bought in.[8D]
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Old 01-15-2007, 12:35 PM
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Default RE: Sunday noon Revver sounds


ORIGINAL: vicman

Evan, Very nice!
My neighbor came over and told me how good my engine sounded one day even commented on how loud it was while he was in his basement. Then another one showed up with a copy of the hood restrictions listing model airplane engines[X(]. Didn't see that one when I bought in.[8D]
I wonder if I have hood restrictions? I know there are city ordinances.... Just another reason for electrics....
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Old 01-15-2007, 01:46 PM
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Default RE: Sunday noon Revver sounds

We have a village and county ordinance for noise after 11pm but I was surprised to see the one for the hood. I gotta admit the DF engine break in was loud[8D]
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Old 01-15-2007, 09:18 PM
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Default RE: Sunday noon Revver sounds

Evan, that looks sweet! What airframe is that? Or did you design that yourself? If so, you did a great job. I bet it moves pretty well. Do you have any idea where I can find a 1 1/4" alu spinner for this little MVVS?

Strykaas, I originally bought this engine for a 1/2A Shrike, so that's where it's going. I'll probably get a new engine, and copy the modifications when I'm done... because this one has been apart at least 20-25 times, it's a miracle it even runs at all...

Over here the village ordinances state that "testing of internal combustion engines" is prohibited all together... but I figure as long as nobody calls the cops on me, I'm free to do as I please. This is still supposed to be a free country.
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Old 01-16-2007, 01:11 PM
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Default RE: Sunday noon Revver sounds

It's a Cheetah and alot of the glider sites sell them, small, 32.75" span... This is where I got mine. Could easily be modded to gas but I've been messing more and more with electrics. I think they are the future. Just when you think there can't be anything else new a new higher C battery comes out, the latest normal packs are 25C with 40C burst!

http://www.espritmodel.com/index.asp...OD&ProdID=2179

I have had good luck with the Magnum and Tru Turn spinners, same basic turned aluminium, Magnums are much cheaper. Both should have 1.25 is a couple of shapes. 30mm is common but 1.25" is 31.75mm....
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