RE: CRRC PRO GF26I  
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RE: CRRC PRO GF26I - 3/24/2007 11:14:19 PM   
Tired Old Man


 

Posts: 11367
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		That's a very good looking installation but the very long standoffs, at least for me, are a cause of concern. There's a lot of torque that will be transmitted to those long legs when the engine is running. Each cycle of the throttle will transmit most of the engine torque to the standoffs, and much less will make to the airframe. What's the possibility of one, and then more, of the engine mounting lugs eventually twisting off, or a bolt being pulled through the firewall over a period of time?

Better would be some type of plate at the engine end of the standoffs, with another 1/3 of the distance from the firewall to tie the legs together. A pair of wood blocks, each attached to a pair of mounting lugs would be bertter still.

_____________________________

If you can''''t fix it with a hammer, you have an electrical problem.

(in reply to TrikeFlyer)
       Post #: 101

RE: CRRC PRO GF26I - 3/25/2007 11:17:26 PM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		That's a great idea Silversurfer, thanks for the suggestion as I have been staring at those long spacers myself.

Although I have seen DA50's on 3" long spacers and they have twice the torque that this engine has and my spacers are only 2.5 inches.

Since I don't have any spacers that are long enough in one piece ( the ones in the picture are 1/4' too short to clear the cowling) I may use two lengths of spacers with a plate in the middle to tie them all together so they don't twist with torque OR I could just make an extension for the engine box with a new firewall but will be heavier than the spacers with a torque plate.

Either way I am als concerned about the effect of torque trying to twist the spacers and will revise or beef it up B4 flying.

Trike

.

(in reply to Tired Old Man)
       Post #: 102

RE: CRRC PRO GF26I - 3/27/2007 11:30:37 PM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		Been raining here last day & half so got more done on the Laser. Just need to install servo links, trim cowl, and program radio. rain forecast for Thurs eve and Fri so hopefully it will clear out for Sat or Sun maiden flight.

Here are some pics without cowl.

(in reply to TrikeFlyer)
       Post #: 103

RE: CRRC PRO GF26I - 3/27/2007 11:32:12 PM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		oops , try the pics again folks.

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(in reply to TrikeFlyer)
       Post #: 104

RE: CRRC PRO GF26I - 4/5/2007 5:00:38 PM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		Rain, rain, rain and now a tornado!! Sorry I haven't got to maiden the Laser with the GF26I engine due to bad weather.

We should all applaud CRRCpro group and Western Hobbies, the US distributor for this engine, for taking the time to go through this prototype engine evaluation program instead of just rushing to market another Chinese engine without good quality control.

Trike

(in reply to TrikeFlyer)
       Post #: 105

RE: CRRC PRO GF26I - 4/6/2007 11:39:00 AM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline 		YEEEHAAA!!!!!!!!

i got my engine running!!!. im still using my old 45cc ignition...but i have it all working. and yes i have it running on petrol(gasoline) this time using a 25:1 mineral oil mix.

something i have noticed...my engine LOVES running backwards!!. its a effort to get it to run forwards at times. i think i have around an hour total run time now. still working out the nasty vibration but have still to re-work the woodruff key in the hope that its the problem.

i have a video clip of it running but cant get it off my phone...will try and get it on here ASAP.

next step is to get my airframe up to speed ready for this engine.

cheers
craig

(in reply to TrikeFlyer)
       Post #: 106

RE: CRRC PRO GF26I - 4/6/2007 3:54:35 PM   
pe reivers



Posts: 2517
Joined: 1/23/2002
From: Arcen, , NETHERLANDS
Status: online 		The engine may have the ignition way too much advanced.
Are you running the RCexl ignition? If not, take out the woodruff key, clean and degrease the taper, and refit the prop driver (without the key) to match an ignition point between 20 and 30 degrees before top dead center.
It will be easy to hear if the ignition is retarded too much, but excess vibration should be gone.

_____________________________

Pe, Dealer for MVVS, MTW and Mejzlik; www.mvvs.nl
There is sanctuary in analisys.

(in reply to hardtop351)
       Post #: 107

RE: CRRC PRO GF26I - 4/6/2007 11:14:30 PM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline
i got an email from the factory telling me that the new CDI's are on their way. i will wait for it to arrive before i start playing with woodruff key location. for now i will keep using my GF45 ignition just to get run time on the engine.

i have also gotten the airframe i will be using out of the storage room and will be getting it sorted ready to take this engine.

cheers
craig

(in reply to pe reivers)
       Post #: 108

RE: CRRC PRO GF26I - 4/7/2007 1:37:45 AM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		Hey Hardtop, I think Pe Reivers may be right that your ignition is too far advanced. My Ryobi conversions with a fixed CH ignition vibrrated like heck at the low end do to too much advance. When I switched to an auto advance ignition the vibration all went away.

(in reply to hardtop351)
       Post #: 109

RE: CRRC PRO GF26I - 4/7/2007 1:40:00 AM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		Weather forecast for Dallas tomorrow is rain or sleet & possible snow with 36 degrees. Sounds like great weather to maiden a plane, eh??

(in reply to TrikeFlyer)
       Post #: 110

RE: CRRC PRO GF26I - 4/7/2007 2:05:12 PM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline
quote:

ORIGINAL: TrikeFlyer

Weather forecast for Dallas tomorrow is rain or sleet & possible snow with 36 degrees. Sounds like great weather to maiden a plane, eh??


is that 36 degrees in celcius???...seems a little strange for snow if its that hot!!. bugger the rain mate.....go fly in between showers like we do here in oz maate!!!

cheers
craig

(in reply to TrikeFlyer)
       Post #: 111

RE: CRRC PRO GF26I - 4/7/2007 2:22:18 PM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline 		yeah i think the timing is a little out using a different ignition meant for a different engine. but i will still wait for this new cdi unit to show up and see what happens from there. i'll go back and re-balance the prop and check the key isn't pushing the extension shaft off centre.

cheers
craig

(in reply to hardtop351)
       Post #: 112

RE: CRRC PRO GF26I - 4/7/2007 10:46:35 PM   
pe reivers



Posts: 2517
Joined: 1/23/2002
From: Arcen, , NETHERLANDS
Status: online 		Hardtop,
Check the taper in the prop driver, and the match to the crankshaft taper. On all three engines I checked, there was a clear mismatched which caused the prop driver to wobble. Trueing up the driver in my old trusted Myford ML7 cured it.

_____________________________

Pe, Dealer for MVVS, MTW and Mejzlik; www.mvvs.nl
There is sanctuary in analisys.

(in reply to hardtop351)
       Post #: 113

RE: CRRC PRO GF26I - 4/8/2007 9:56:26 AM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline

yes the myford lathes are a tried and proven machine...i like them. i also have a liking for the lunan breed of lathe. chinese made and very accurate.

the engine is on the bench ready to be looked at so will report back soon on my findings.

cheers
craig

(in reply to pe reivers)
       Post #: 114

RE: CRRC PRO GF26I - 4/12/2007 10:35:23 PM