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Old 09-13-2009, 04:10 PM   #286
olddog1956
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Default Re: Real world RPM

3w 80xi
26x10 evolution prop
32 to 1 lawnboy ashless
425ft altitude
6600 (conservatively tuned ie rich)
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Old 09-13-2009, 11:13 PM   #287
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Default Re: Real world RPM

dl-50 stock muffler regular unleaded no ethanol

penzoil air cooled 40:1

1600ft msl

~76 degree oat

7 gallons jxf 22x8

7300 rpm
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Last edited by tailwheelteacher; 09-16-2009 at 12:43 AM. Reason: muff
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Old 09-14-2009, 05:27 AM   #288
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Default Re: Real world RPM

2nd DLE 30 MA classic 18x8 8300rpm 1600 idle
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Old 09-14-2009, 03:04 PM   #289
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Default Re: Real world RPM

MVVS116
RE2 pipes 400mm long header
30x14 engel prop, brisk response.
6090 rpm
as reported by Lennart Olson
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Old 09-15-2009, 12:11 PM   #290
flygilmore
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Default Re: Real world RPM

Only posting because it impressed me....

33cc Homelite (came from a Ranger saw) converted by myself....18x6 Xoar @ 8,800rpm!

DL50 stock muffler
Vess 23A
7,300rpm
5gal. through it
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Old 09-16-2009, 10:17 PM   #291
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Default Re: Real world RPM

New DLE 30 with about 1/2 hour running time on a test stand....CORRECTLY TUNED, NOT 'FACTORY'
32-1 generic oil...87 octane pump gas..6800 ASL 65 degrees F..28 degrees BTDC..
Stock muffler...20-6 JC prop, 7600 rpm..18-8 JC prop, 8300 rpm..
Slimline Pitts, about 200 rpm less..
Mejzik 18-6 8900, same as a G26...A G26 won't turn the other props as fast as the DL 30...l
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Old 09-17-2009, 04:11 PM   #292
flygilmore
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Default Re: Real world RPM

Stock mag. equipped Zenoah G-62 with Bennett muffler...Vess 22B @ 7800
Alt. 2100ft. Temp: 85*
Under 2gal. through the engine-keeps getting stronger each time out!!
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Old 09-17-2009, 04:53 PM   #293
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Default Re: Real world RPM

Zenoah....is that a new engine from China? ;-)
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Old 09-17-2009, 06:06 PM   #294
rcign
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Default Re: Real world RPM

Funny Rich, very funny Wow, 7800 with a Vess 22A..How can that be ? EVERYONE knows G62s in particular and Zenoahs in general are overweight underpowered boat anchors Except my 4 lb G62 lites
How about a piped 62 turning a 22-8 at 8400 ???? Fast enough ? Think a Chinese wonder engine would survive doing that ???
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Old 09-18-2009, 11:21 AM   #295
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Hold on now Ralph...that was a Vess 22B!!I know my Zenoahs have a beautiful, linear transition...no muddy midrange from these engines!
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Old 09-18-2009, 01:18 PM   #296
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Default Re: Real world RPM

My 62 on a pipe (if memory serves) will spin a 23A over 7700, and the B should be over 7500
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Old 09-18-2009, 01:48 PM   #297
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Default Re: Real world RPM

RTK sounds right.

Here is the 62/pipe on Vess 23A at 7800

And 22A at 8400, same setup

Any of you notice that Pe updated his prop calculator for Vess? ( http://www.mvvs.nl/ ) At 7800 and sea level it would be an approx 7.5 hp/44 lbs thrust, and at 8400 approx 7.8 hp!!!

That is one strong boat anchor!!!
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Old 09-18-2009, 07:14 PM   #298
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Old 09-18-2009, 07:30 PM   #299
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Nothing like having just enough power
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Old 09-18-2009, 09:24 PM   #300
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Default Re: Real world RPM

Engine Torch 90 on AMT 105 pipe. Royal Purple at 80-1.

We are at sea level and the air temp today is about 88 degrees. The engine was allowed to cool down and short warm up each time for consistent results.

JC 27x8 two blade 7300 hot

Mejlik 26x10 two blade 6900 hot

JC 24x10x3N 6400 hot.

Results checked by Cinderella giving the 1000 mile stare.
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