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

some nice speed here

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Old 11-24-2009, 12:31 PM
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mk1spitfire
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Default some nice speed here

came across this, Looks like it fired up on its own after it cut out from starting,unless course video edit?.?

[youtube]http://www.youtube.com/watch?v=mMdZb3qbv3k&feature=related[/youtube]
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Old 11-24-2009, 01:04 PM
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Default RE: some nice speed here

Looks like it fired as soon as he hit plug heat. He turned it back against compression before bending down. Dunno if that is common.. surprise!
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Old 11-24-2009, 01:23 PM
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Default RE: some nice speed here

Holy carp. 217mph? The video makes it look like he's going 400!
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Old 11-24-2009, 01:45 PM
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Default RE: some nice speed here

Thise vides from inside the course tend to look like that. He is downright hauling though, no doubt.
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Old 11-24-2009, 02:10 PM
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Default RE: some nice speed here

You can really hear the difference over the Nelson. It would be interesting to know what that difference is, but it would most likely cost several hundred dollars to find out. I'm assuming we just watched a Profi and not a Nelson.......
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Old 11-24-2009, 02:14 PM
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Default RE: some nice speed here

Probably about 5k rpm? I'm going to have to turn my needle to the right some more...
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Old 11-24-2009, 02:25 PM
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Default RE: some nice speed here

I think the Nelson turns a 7x7.2 close to 30 in the air. Judging from the sound of that video that engine is revving over 32-35,000 which sounds more like a .061 Cyclon....just louder.
I suspect Profi needs higher exhaust timing and lighter parts to get it done. At 550 cycles per second, micro grams on the piston and pin show up. In order to get into the higher range, I hear they reduce prop diameter to 6.75" or so.
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Old 11-24-2009, 02:31 PM
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Default RE: some nice speed here

sadly, no info on that block. Sure revs up sweet and angry
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Old 11-24-2009, 02:46 PM
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Default RE: some nice speed here

My Q40 has started after not having the glow driver on it for a few seconds...but never on it's own. Guess the coil holds enough heat? Or the fuel/coil reaction hadn't hit that point? Must have been off of it for 4 to 5 seconds.
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Old 11-24-2009, 08:46 PM
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Default RE: some nice speed here

Profi info seems to be strangely absent.


Ive had a few engine fire up moments after just putting the glow plug on. Spooky
They had been running earlier that day thou.
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Old 11-24-2009, 10:53 PM
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Default RE: some nice speed here

Just fill 'em with enough O:F vapor in the combustion range and off you go. I guess it's a roulette game, one in a while you get it.

As to post-plug heat starts, I've started .049's seconds after they've stopped before. Also got a few brrrrps out of a GMS .32 the other day after it had quit from a too long check pinch combined with needing open a couple of clicks back.

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Old 11-24-2009, 10:58 PM
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Default RE: some nice speed here

[link=http://www.xs4all.nl/~fiorimet/index.htm]MB40[/link]

That's all you'll find on line rom the mfg. I think mkI already posted this.

To quote Rob Metjkemeir [I tried spelling that from memory, sorry] "I do the assembling, repair and sell/expedition from my home address. Engine incl. spinner, excl. pipe is Euro 460."


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Old 11-24-2009, 11:54 PM
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Default RE: some nice speed here



Some engines are easier on the eye than others.....

Enjoy the viewing.....
P

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Old 11-25-2009, 08:04 AM
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Default RE: some nice speed here



Definitely looks "functional".

I'm not sure the intake is large enough though.

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