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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> RE: RCG 20cc question...
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RE: RCG 20cc question... - 10/26/2012 11:18 AM   
Lifer


 

Posts: 1684
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Last Login: 5/25/2013
From: Kansas City, MO, USA
Status: offline 		You will like the TF P-47! Good flyer, and good landing qualities. I did shim the rear retract mounts for a grass runway. About 3/32nds fixed any nose-over issues. With a DLE 20 and a Xoar 16x8, it really moves fast.

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RE: RCG 20cc question... - 11/15/2012 2:21 AM   
Bob Paris


 

Posts: 1275
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Joined: 11/4/2002
Last Login: 5/26/2013
From: Lahaina, HI, USA
Status: offline 		Hi Guys...
I have an update on my RGC 20 powered Ugly Stick.

Now with over 55 flights, I had a DuBro anti-vibration engine mount brake. It was the right hand side that broke and it broke while in the air. Out of nowhere, my engine would not idle properly...and even at full down trim on Tx, it would still run. So I landed and using a engine kill with my Tx, got the engine stopped.

I took a look at the model, and the only issue was a cracked right side engine mount...and with the model engine moving forward...changed the idle on this model.

I was puzzled at why it cracked and broke, for I've used three other DuBro anti vibration engine mounts on three other engines...without any problems. It cracked at the aft engine mounting hole, on the right side...only. So I had only one mount holding the engine on the airframe...lucky me it didn't come loose altogether.

I contacted Tower Hobbies, and they informed me that I needed to contact DuBro directly...and I did. I sent DuBro several pictures of the crack, on and off the model. They called me the day after they received the e-mail, and sent me a new right side anti vibration 1.20 size engine mount, with all bushings and inserts. I received the parts one week after their phone call...and I finished the instilation today.

Thank you DuBro.

Now...what could have created the failure....? I've used these engine mounts for years and I never had one crack...not even with a complete wipe-out. Soooo...when I reinstalled the new engine mount...I made sure I over drilled the holes .01 so the engine mounting screws would not bind. After installing the engine mounting screws, the main fire wall mounting screws would not line up well on the lower right side. So I loosened up the right side engine mounting screws, lined up the fire wall mounting screws-got it to go in and then secured all hardware. I feel I have a small bind on the right side aft engine mounting bolt. If it cracks there again, I will know what caused it to crack.

My DLE RPM guage went south on me, so I replaced it with a new unit. I wonder what caused it to go bad...and only the last two digits would light up, with the first two going dark. Has anyone else had problems with their digital on-board electronic tacks ?

My engine is dialed in and works like a charm.


Soft Landings Always,
Bobby of Maui

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RE: RCG 20cc question... - 11/15/2012 1:38 PM   
ahicks


 

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From: Waterford, MI, USA
Status: offline 		Thanks for the update Bob, and welcome to the vibration problems associated with gas! They'll give you new appreciation for thorough pre-flights!

Glad you caught it prior to it becoming a bigger issue? Like one that might have been cowled in?

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RE: RCG 20cc question... - 11/15/2012 1:52 PM   
acerc



Posts: 3095
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From: lithia, FL, USA
Status: offline 		I have seen several of those aluminum mount's break just like in your photo. I don't think the aluminum can stand up to the gas engine's. Just my opinion so please don't start a why they are great war.


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RE: RCG 20cc question... - 11/15/2012 5:04 PM   
gringopete



Posts: 88
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Joined: 7/21/2010
Last Login: 5/6/2013
From: , NJ, USA
Status: offline 		It most likely cracked because the aluminum beam is tapered. When the bolt is tighten against the mount the head is on an angle. pulling the bolt on an angle. Like splitting wood. I would drill out the tapped holes in the engine, then drill and tap the engine mount. Bolt the engine in from the top. This should fix the problem.


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