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Cox Engine of The Month
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The Dirty Duo
Page 1 of 1
The Dirty Duo
Cribbs74 Thu Oct 04, 2012 9:09 pm
Maidened the Bean.....wasn't impressed. The engine ran like crap in the air even though on the ground it was great. It kept doing roller coaster like climbs and dives as the engine surged. I did one loop and just hung on until the engine quit. Once it did it was the best glide of all my planes so I know it's not tail heavy. I think I have a fuel draw issue.
Broke out the BRM and flew that bugger hard and fast. Many loops a really poor lazy 8 that ended me upside down so I flew 2 laps inverted and then the engine quit and I landed the same way. Since the reinforcing and epoxy work it's nearly indestructable. It was a whole different plane tonight. I did move my leadouts a little rearward and I think it had a big effect. Here is a pic of the dirty birds after the flight. Click on the linkee if the pics no workee.
Ron
https://i.imgur.com/Ki784.jpg
https://i.imgur.com/sAcxI.jpg
Broke out the BRM and flew that bugger hard and fast. Many loops a really poor lazy 8 that ended me upside down so I flew 2 laps inverted and then the engine quit and I landed the same way. Since the reinforcing and epoxy work it's nearly indestructable. It was a whole different plane tonight. I did move my leadouts a little rearward and I think it had a big effect. Here is a pic of the dirty birds after the flight. Click on the linkee if the pics no workee.
Ron
https://i.imgur.com/Ki784.jpg
https://i.imgur.com/sAcxI.jpg
Cribbs74- Moderator
Posts : 11895
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: The Dirty Duo
RknRusty Thu Oct 04, 2012 10:53 pm
A faceoff! Those tanked engines can be so fussy. If it glided well, then it probably flies well. Good to hear. Swap engines if it keeps acting up. A Medallion with an SPI set and a party balloon worked great on mine.
_________________
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: The Dirty Duo
JPvelo Fri Oct 05, 2012 12:58 am
Tear down the engine, check for crap behind reed, check the venturi gasket. Venturi gaskets made of fuel tubing work wonders.
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re: success at last
happydad Fri Oct 05, 2012 1:05 am
cribbs74 wrote:Maidened the Bean.....wasn't impressed. The engine ran like crap in the air even though on the ground it was great. It kept doing roller coaster like climbs and dives as the engine surged. I did one loop and just hung on until the engine quit. Once it did it was the best glide of all my planes so I know it's not tail heavy. I think I have a fuel draw issue.
Broke out the BRM and flew that bugger hard and fast. Many loops a really poor lazy 8 that ended me upside down so I flew 2 laps inverted and then the engine quit and I landed the same way. Since the reinforcing and epoxy work it's nearly indestructable. It was a whole different plane tonight. I did move my leadouts a little rearward and I think it had a big effect. Here is a pic of the dirty birds after the flight. Click on the linkee if the pics no workee.
Ron
https://i.imgur.com/Ki784.jpg
https://i.imgur.com/sAcxI.jpg
patience is a virtue. success at last. no sarcasm today. happydad
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Re: The Dirty Duo
Cribbs74 Fri Oct 05, 2012 8:23 am
JPvelo wrote:Tear down the engine, check for crap behind reed, check the venturi gasket. Venturi gaskets made of fuel tubing work wonders.
Yeah, I always go through my engines before mounting. That's one thing I am pretty particular about. I use fuel tube gaskets as well. If the reed had dirt in it then I probably would notice it all the time. My guess is the new fuel pickup tube has a kink or it's somehow blocked. I'll break it down and do a once over.
I could always do a medallion except I would have to come up with a way to mount it Rusty.
No worries Happydad! I have really thick skin!
Ron
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Re: The Dirty Duo
JPvelo Fri Oct 05, 2012 9:12 am
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Re: The Dirty Duo
PV Pilot Fri Oct 05, 2012 9:51 am
Good to hear Ron, Congrats!
Had a really nice Beech Staggerwing that I finished up superbly. Motor ran great on the pad, once it was released it did the surge thing for about 1/2 circle. It finally caught the needle and did a loose line wingover right overhead and then proceeded to dig a straight-in hole into the asphalt. Bits and pieces.
Had a really nice Beech Staggerwing that I finished up superbly. Motor ran great on the pad, once it was released it did the surge thing for about 1/2 circle. It finally caught the needle and did a loose line wingover right overhead and then proceeded to dig a straight-in hole into the asphalt. Bits and pieces.
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Re: The Dirty Duo
happydad Fri Oct 05, 2012 5:53 pm
cribbs74 wrote:JPvelo wrote:Tear down the engine, check for crap behind reed, check the venturi gasket. Venturi gaskets made of fuel tubing work wonders.
Yeah, I always go through my engines before mounting. That's one thing I am pretty particular about. I use fuel tube gaskets as well. If the reed had dirt in it then I probably would notice it all the time. My guess is the new fuel pickup tube has a kink or it's somehow blocked. I'll break it down and do a once over.
I could always do a medallion except I would have to come up with a way to mount it Rusty.
No worries Happydad! I have really thick skin!
Ron
no worries, i'll send you an engine mount for the medallion to the bean or clown. happydad :cox logo
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Re: The Dirty Duo
Cribbs74 Fri Oct 05, 2012 7:51 pm
PV Pilot wrote:Good to hear Ron, Congrats!
Had a really nice Beech Staggerwing that I finished up superbly. Motor ran great on the pad, once it was released it did the surge thing for about 1/2 circle. It finally caught the needle and did a loose line wingover right overhead and then proceeded to dig a straight-in hole into the asphalt. Bits and pieces.
Thanks,
Bet that was a bad day!
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Re: The Dirty Duo
Cribbs74 Fri Oct 05, 2012 10:25 pm
I've got a bunch of those. Unfortunately the Bean has the plastic snout that acts as a landing gear mount and an engine mount. So those won't work unless I dimantle the front end and since I epoxied it like crazy there is a good chance I will destroy it!
Thanks for the suggestion though.
Ron
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Re: The Dirty Duo
John Goddard Sat Oct 06, 2012 12:34 am
Don't forget Ron they lean out quite a bit once in the air.
Try richening it quarter or even half a turn.
J
Try richening it quarter or even half a turn.
J
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Re: The Dirty Duo
Cribbs74 Sat Oct 06, 2012 7:40 am
John Goddard wrote:Don't forget Ron they lean out quite a bit once in the air.
Try richening it quarter or even half a turn.
J
I suppose anything is possible John. I went through it last night and made some adjustments to the fuel pickup tube. I ground ran it after and it ran ok. A little hard to needle, but I am going to have to really test it where it counts, in the air.
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Re: The Dirty Duo
SuperDave Sat Oct 06, 2012 10:42 am
JB's advice is well founded.
It is a common practice experienced CL pilots to lauch with slightly rich needles, some even to the point of nearly four-cyling the engine. Flying the pattern will cause the engine to break into peak RPM's just when the pilot needs and extra "boost" of power to complete the manuver gracefully.
A good stunt plane will have enough wing area that it need not require peak RPM all the time. Competitive stunt flying requires grance and finese rather than all out speed.
It is a common practice experienced CL pilots to lauch with slightly rich needles, some even to the point of nearly four-cyling the engine. Flying the pattern will cause the engine to break into peak RPM's just when the pilot needs and extra "boost" of power to complete the manuver gracefully.
A good stunt plane will have enough wing area that it need not require peak RPM all the time. Competitive stunt flying requires grance and finese rather than all out speed.
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