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RE: improved vibration - 12/10/2009 4:41 PM   
Arruda


 

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From: Rio de JaneiroRJ, BRAZIL
Status: offline 		Burgerup, where did you place the aluminum back plate that comes with the engine to fix it in the firewall?

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RE: improved vibration - 12/10/2009 7:27 PM   
bugerdup


 

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quote:

ORIGINAL: Arruda

Burgerup, where did you place the aluminum back plate that comes with the engine to fix it in the firewall?

Arruba,
Due to the construction of the Top-Flite kit you are unable to mount the backing plate without cutting it in half, so I reinforced the back of the fire wall with two pieces of 1/8'' ply epoxied to the back of the fire wall. I have since installed the vibration isolator and mounted the backing plate to that. I also used larger hardware.

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RE: improved vibration - 12/10/2009 7:51 PM   
Arruda


 

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From: Rio de JaneiroRJ, BRAZIL
Status: offline 		Thank you Burgerdup.
I have a 90 sp and it took 2,5 galons to get a consistent idle and transition.
The vibrations will never go away, but it is possible to live with it.
I just reinforce the firewall and the junction between the wing and fuselage.

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RE: improved vibration - 12/17/2009 11:23 PM   
ktcanuck


 

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Status: offline 		I have to ask, and forgive me if there is an obvious answer that I am missing, since here we have a fairly broad spectrum of users having the same problem with this engine but I have yet to see any words of wisdom or comment from RCV or their agents. Some level of comment from the designer might be helpful to avoid or mitigate the problems being encountered. The engine documentation talks to the expectation of higher torque due to the 2 to 1 gearing but there is no reason to expect a level of vibration that shakes the bejabus (sp.?) out of our new babies.

Anyone?

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RE: improved vibration - 12/19/2009 8:27 AM   
gasayers


 

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From: Auckland, SK, NEW ZEALAND
Status: offline 		Well I've found part of my problem. After reading that the 18" prop should have no more than 1mm play at the tips I removed the gasket.
Now the gears are "bottoming out". Trouble is if I get the gaskets to stop the gears bottoming out then I get more than 1mm play on the prop.
Conundrum!



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RE: improved vibration - 12/19/2009 1:04 PM   
barry wetherell


 

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From: port hedlandwestern australia, AUSTRALIA
Status: offline 		Gassayer, which is the better option???
A.a Barry

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RE: improved vibration - 12/19/2009 1:21 PM   
barry wetherell


 

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From: port hedlandwestern australia, AUSTRALIA
Status: offline 		yea me again, I,m just about to "unload 2 x sp 90's , for all the above the reasons, anything you think might improve, would be greatly appreciated, Gasayer, as for the manufacture, one would think that some message would have got through, it is strange a forum as big as RCU, is, they haven't added any comment, or do they "let sleeping dogs lie"
A.a Barry

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RE: improved vibration - 12/19/2009 3:48 PM   
gasayers


 

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Sorry about that Barry. It was never my intension to put anyone off these motors. As stated, mine started, ran, idled, transitioned, developed power as good as any other motor used. Really wanted to get mine going and this is supposed to be the manufacturers, (or representative) forum.

Also remember the 90 does not appear to have the issue to anywhere near the same degree and the  http://manuals.hobbico.com/gpm/gpmg2000-manual-v1_2.pdf   should remove any remaining issues easily.

You have to assume they've sold literally hundreds if not thousands of these motors and presumable a lot are being used quite successfully.
I will have another go with mine as I refuse to be beat and in fairness I have not contacted RCV directly which would be the logical thing to do.
Now that I've repowered my spitfire electrically the urgency has gone out of the rcv so it could be awhile before I sort it out. But rest assured it'll be getting more attention yet. It'll just go into something different.

 

There is an sp running very regularly at our club and it’s awesome.
Cheers
Glen

The second diagram is the only useable option as the gears bottoming out will beggar the bearings very quickly if not already ruined.

 



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RE: improved vibration - 12/20/2009 11:51 PM   
andi3142001


 

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Status: offline 		Hi,

one question to the engine mount system from great planes: If I understand the drawing right the screws are surrounded by rubber grommets. The grommets are squeezed together when the screws are tightened.
Is that right?

Cheers
Andi


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RE: improved vibration - 12/21/2009 1:55 AM   
bugerdup


 

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From: sarnia, ON, CANADA
Status: offline 		Yeah, It comes with 1/4 20 bolts and blind nuts and washers. the rubber is very hard and makes it feel very solid when tightened.

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RE: improved vibration - 12/21/2009 11:34 AM   
andi3142001


 

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Status: offline 		Well thanks I see you can even use a rod for throttle, and do not need a bowden cable. So this mounting system keeps things rigid and absorbs vibration energy.
Seems perfect!

Cheers
Andi

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RE: improved vibration - 12/21/2009 10:59 PM   
andi3142001


 

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Status: offline 		Did anybody try those http://www.blindnieten.at/HTML/en/Produkte/neoprene.html ?

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RE: improved vibration - 1/21/2010 9:24 PM   
Arruda


 

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Hi Bugerdup,

I loved your muffler.

Did you make it yourself or it is available somewhere?

Leonardo

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RE: improved vibration - 1/21/2010 9:50 PM   
bugerdup


 

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Status: offline 		I bought it from Keleocreations.com It was redesigned and this is it. very high quality and outstanding service. $105.00. check him out. the first muffler had a ring and two down pipes and failed due to the vibrations from this engine. the new version is steel with a simpler mount. It also comes with an adapter that screws into the exhaust port, then the muffler threads to that.

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RE: improved vibration - 1/22/2010 9:08 PM   
Arruda


 

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From: Rio de JaneiroRJ, BRAZIL
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Bugerdup: Thank you once again.

Have you already flown this setup?

I had problems with both the RCV and OS mufflers (the RCV looses the tip and the OS looses the pressure tap).

If the Keleo muffler resists the vibration and high temperatures involved it will be a success.



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RE: improved vibration - 1/22/2010 9:57 PM   
bugerdup


 

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From: sarnia, ON, CANADA
Status: offline 		Yes, the back of the muffler has a bracket welded to it that uses the lower mounting bolt holes on the engine so it does not move. I have run this set up with great success and It sounds awesome.

Although my engine configuration may be different then yours, (starter on the side) Let Kelvin know when you order, (stock or rotated). He made the bracket to fit my setup.

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RE: improved vibration - 8/16/2010 10:04 PM   
andi3142001


 

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From: , AUSTRIA
Status: offline 		Hi guys,

the following story could maybe bring some light to the vibration issue. Some days ago I had a crash. "Landing" was out of sight, damage was minor, but evidence showed that the plane has hit the -soft - ground nose first. After inspection, the engine was clean, I noticed that it was much harder to turn over by hand. Made a test run - vibrations were awfull. My SP was always a smooth performer, but now it was shaking like hell and rpms were poor.
A flying buddy, who was interested to see the inside of the engine since the day he saw it first installed in my plane, disassembled the engine, and before I could do something against it he took a piece of hard wood and a hammer, placed the hardwood onto the gear of the cylinder jacket, and applied two gentle hits.
Assembled again - the engine was easy to turn by hand. Fired it up - no vibrations, performance as ever.
I have no equipment to measure the play in the gear. But obviously its fundamental to engine behaviour. I do not know wether my buddy was just lucky to get it right, however there are certanly some tolerances. According to his opinion it is important that there is no play when you turn the prop, the starter screw has to turn instantaniously.

regards
Andi


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       Post #: 67

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