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Reasonable RPM for a Pee Wee .020 ?
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Reasonable RPM for a Pee Wee .020 ?
Kim Tue Aug 14, 2012 7:12 am
You guys think think that mid-to-upper 13's is a good speed for a Pee Wee .020? I'm trying to get more of my Plastic Air Force flying, and this is the engine for my Mini Stunt.
Fuel is Sig 35%, regular head, and the prop is the stock little round-tip that comes with the plane. The good news is that it's needle setting is pretty consistent, and it starts easily too.
It SOUNDS like it's it's running a lot faster than what my tach is showing, and it will probably pill the little biplane around at a pretty good clip as-is. I just thought it ought to average a little higher.
Thanks !
Fuel is Sig 35%, regular head, and the prop is the stock little round-tip that comes with the plane. The good news is that it's needle setting is pretty consistent, and it starts easily too.
It SOUNDS like it's it's running a lot faster than what my tach is showing, and it will probably pill the little biplane around at a pretty good clip as-is. I just thought it ought to average a little higher.
Thanks !
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Re: Reasonable RPM for a Pee Wee .020 ?
RknRusty Tue Aug 14, 2012 9:10 am
I can't find an .020 test report, but this dude's engine runs at 20K when he changes props half way through the video.
I love that little green plane. I hope you'll video a flight sometime.
I love that little green plane. I hope you'll video a flight sometime.
Last edited by RknRusty on Tue Aug 14, 2012 9:21 am; edited 1 time in total
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Re: Reasonable RPM for a Pee Wee .020 ?
microflitedude Tue Aug 14, 2012 9:19 am
It all depends on the prop. what size are you using? 4x3?
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Re: Reasonable RPM for a Pee Wee .020 ?
Cribbs74 Tue Aug 14, 2012 11:10 am
Kim,
According to Peter Chinn you should be turning around 17K on that prop. There is a good read about the Pee Wee on the Aerotools site.
Ron
According to Peter Chinn you should be turning around 17K on that prop. There is a good read about the Pee Wee on the Aerotools site.
Ron
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Re: Reasonable RPM for a Pee Wee .020 ?
Cribbs74 Tue Aug 14, 2012 11:12 am
Kim,
According to Peter Chinn you should be turning around 17K on that prop. There is a good read about the Pee Wee on the Aerotools site.
http://www.mh-aerotools.de/airfoils/documents/cox_test_peewee_020_aeromodeller_march_1976.pdf
Ron
According to Peter Chinn you should be turning around 17K on that prop. There is a good read about the Pee Wee on the Aerotools site.
http://www.mh-aerotools.de/airfoils/documents/cox_test_peewee_020_aeromodeller_march_1976.pdf
Ron
Last edited by cribbs74 on Tue Aug 14, 2012 11:45 am; edited 1 time in total
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Re: Reasonable RPM for a Pee Wee .020 ?
Kim Tue Aug 14, 2012 11:24 am
cribbs74 wrote:Kim,
According to Peter Chinn you should be turning around 17K on that prop. There is a good read about the Pee Wee on the Aerotools site.
Ron
I THOUGHT as much...thanks Ron ! May check the cylinder for varnish, and try another glowhead. 17k would be great !
-----------------------------------------------------------------------
by RknRusty on Tue Aug 14, 2012 9:10 am
I can't find an .020 test report, but this dude's engine runs at 20K when he changes props half way through the video.
I love that little green plane. I hope you'll video a flight sometime.
That's my intent Rusty ! I've got several of these engines, and am gonna search for the healthiest one to drag this little plane around!
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Re: Reasonable RPM for a Pee Wee .020 ?
PV Pilot Tue Aug 14, 2012 11:48 am
RknRusty wrote:I can't find an .020 test report, but this dude's engine runs at 20K when he changes props half way through the video.
I love that little green plane. I hope you'll video a flight sometime.
ABOUT 1 min 22 sec on the higher pitch. ABOUT 1 min 10 sec on the less pitch,,as a general average and all things considered. Not a bad run at all.
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Re: Reasonable RPM for a Pee Wee .020 ?
Cribbs74 Tue Aug 14, 2012 12:38 pm
I just watched the video Rusty posted. I thought the 3 blade prop was more of a load. Guess not.
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Re: Reasonable RPM for a Pee Wee .020 ?
RknRusty Tue Aug 14, 2012 2:34 pm
Maybe at the RPMs we run, compared to full sized planes, our 3 blade props cavitate. That could be where the load disappears if it's spinning in a partial hole in the air.cribbs74 wrote:I just watched the video Rusty posted. I thought the 3 blade prop was more of a load. Guess not.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
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...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
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Re: Reasonable RPM for a Pee Wee .020 ?
Surfer_kris Tue Aug 14, 2012 3:34 pm
RknRusty wrote:Maybe at the RPMs we run, compared to full sized planes, our 3 blade props cavitate. That could be where the load disappears if it's spinning in a partial hole in the air.
The cox three bladed prop for the peewee has a smaller diameter, compared to the two-bladed, which more than compensates for the third blade. No magic in that.
My best rpm readings are on pair with nono fulton. One problem I've had is that the tank heats up and it needs fiddling with the needle to empty each tank...
On diesel it just runs through each tank on the same needle setting.
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