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Home✈️Aircraft🚁HelicopterFuel-Helicopters New or Limited ActivityAirstar › My engine has moved backward
04-07-2013 02:43 AM  6 years ago
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MSouto

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Brazil

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My engine has moved backward
Hello owners mongoose;
I need to solve a mounting problem.

I spent a few days adjusting the carburetor needles and doing tests with my motor on the ground, without the main rotor blades and tail.

The helicopter suffers much vibration when the engine reaches high revs as 19500rpm.

Because of the engine vibration "has moved backward", the fixing screws of the motor slipped into the slot where they are fixed (Botton Frame).

This caused the main belt would look good loose, needing only a light touch to release the gear.

In assembling these I supported the engine mount bolts with epoxy resin rigid precisely to prevent it slipping back and loosen the belt.

Not resolved.

I think in some ways to solve this problem but I wonder if anyone else has experienced this and how to resolve in a definitive manner and professional.

Thank you in advance for your help!
ASI CamCopter, BH Hanson Zenoah 300 RC 3D MAX, MAH 850mm (Version with all options)
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04-07-2013 10:53 AM  6 years ago
wrongler

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Brewerton, New York

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Just a thought here, Try to find the cause of the vibration and fix it.Bill Whittaker
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04-07-2013 11:59 AM  6 years ago
jettime

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usa

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yeah you have something else going on there!! I have never had that happen before. I use loc tight on the bolts but no epoxy? The mounting is pretty simple, make sure the drive belt is on snug but not to the point that it is too tight. Look at the manual i think it has a example. check your throttle curves, are you running a Gov? if so do not try and tune the engine with it on!!

My curves are 0,18,23,55,75 flies great and very stable!!!

this helicopter flies very well in the 900-1200 rpm range (rotor)

I have seen guy's go higher i guess but i guess if you fly 3d

I have mine set around 900rpm and flies with very little stick movement
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04-07-2013 08:17 PM  6 years ago
MSouto

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Brazil

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Just a thought here, Try to find the cause of the vibration and fix it.
Hi Wrongler, Hi Jettime...

I think this vibration is normal because the rotation is very high (19500rpm), what is happening is that the engine slides back and loosens the belt.

My bottom frame is painted with automotive paint. I think I put the belt too tight, adding vibration pulled the motor.

Remembering what I am doing testing engine performance and I am not taking into consideration the speed of the rotor, which in my case is 1100rpm. The tests are being done without the blades, so I'm taking my engine at full speed he can get.

The vibration is excessive because the helicopter is locked with the skis on the ground, this causes the vibration is different from that in flight velocity head at 1100 rpm and at much lower engine.

I like to adjust the engine so without seeing the shovels and maximum yield.

I'll have to put a "shim" behind the screw to prevent the motor slip.

Sorry my bad google translation english
ASI CamCopter, BH Hanson Zenoah 300 RC 3D MAX, MAH 850mm (Version with all options)
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04-08-2013 02:15 PM  6 years ago
BeltFedBrowning

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Kansas City

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If the engine RPM is 19,500, the rotor head RPM is not 1,100 RPM. Decrease the engine RPM and the vibes should decrease. Let me know if I am not understanding.

At 19,500 RPM, the headspeed is 2,145 RPM. YIKES!
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04-09-2013 04:04 PM  6 years ago
clever Heli

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So Cal, CA - USA

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Remove the drive belt
Test with the drive belt removed. See if the vibrations are the same. If yes, the engine is way out of balance. Try a different engine. Gassers have high vibrations, that's just what they do.

Also, see that the clutch bell is true (no wobbles). The clutch bell will spin WHEN the drive belt is removed. You can test by hand and when running. If it's not true, you will experience high vibrations.
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04-10-2013 01:21 AM  6 years ago
MSoutorrNovice - Brazil -
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At 19,500 RPM, the headspeed is 2,145 RPM.
exactly, but read what I wrote.
I'm just testing my engine without the rotor blades, just seeing final yield.
Remembering what I am doing testing engine performance and I am not taking into consideration the speed of the rotor, which in my case is 1100rpm. The tests are being done without the blades, so I'm taking my engine at full speed he can get.
Remove the drive belt
Test with the drive belt removed. See if the vibrations are the same. If yes, the engine is way out of balance. Try a different engine. Gassers have high vibrations, that's just what they do.
The vibration is normal and all is right.
What I wanted to try to explain is that the bolts that fix the engine can not hold it in position when the belt is installed. The motor slide backwards.

http://rc.runryder.com/rr/rrpv.htm?...1/&IN=1&a=1&s=0

Never the engine will be used in these conditions, but I like to set free the engine before putting the rotor blades.
ASI CamCopter, BH Hanson Zenoah 300 RC 3D MAX, MAH 850mm (Version with all options)
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04-10-2013 02:19 AM  6 years ago
BeltFedBrowning

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Kansas City

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If it were my engine and I wanted to test it at that RPM, I would put it on a dyno. It sounds like the centrifugal force of the belt is more than the mounting bolts will hold at that RPM.

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04-10-2013 02:27 AM  6 years ago
JKos

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Redondo Beach, CA

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MSouto,
I think what a few people have been trying to tell you in some of your threads is that what you are doing is not normal or recommended. Running your engine unloaded at such high RPMs is simply not useful or meaningful. Any tuning you do on the bench without the proper load of the blades at the proper RPM is pretty meaningless.

- John
RR rules!
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04-10-2013 03:19 AM  6 years ago
MSouto

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Brazil

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If it were my engine and I wanted to test it at that RPM, I would put it on a dyno. It sounds like the centrifugal force of the belt is more than the mounting bolts will hold at that RPM.
BeltFedBrowning, Beautiful test bench!

Dear JKos...
Obviously the adjustments differ with load and without load.

But what I'm doing is just speeding up my engine without load to see if he responds well to adjustments made in the carburetor needles.

I know that with the blades can change the setting.

I will not use my engine this way, quite the contrary, the rotor will work only between 1000 - 1200rpm and it revs are low.

What you mean is that you should never rev the engine of his helicopter without charge even for a few seconds because he can not bear?????????????

The manual says that the maximum speed is 19500rpm without load, I even 19460rpm.

I can see how is the performance of the motor and adjustments of the carburetor needles, no adjustments to flight.

I can not take off with a helicopter so far is costing U$23000 and run the risk of an auto rotation unsuccessful because they simply can not rev the engine on the ground to see if it responds properly.

I regulate airplanes with propellers, but how to do this with a helicopter blade 1960mm diameter?

Through trial and error in flight?

If I set the helicopter down and give acceleration to step in for rotor flight I imagine he can undo.

Suggestions would be welcome because this is my first helicopter.

Do not worry, I've "learned" to fly Helicopter.
ASI CamCopter, BH Hanson Zenoah 300 RC 3D MAX, MAH 850mm (Version with all options)
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04-10-2013 12:30 PM  6 years ago
hootowl

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Garnet Valley, Pa.

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Everybody else flies their gasser to tune it but you can't?Wolves don't lose sleep over the opinions of sheep
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04-10-2013 06:03 PM  6 years ago
MSouto

rrNovice

Brazil

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Everybody else flies their gasser to tune it but you can't?
Hi Hootowl;
In my post is your answer.
Suggestions would be welcome because this is my first helicopter.
And you say "everybody" is to cover hundreds of thousands of people who can reside in hundreds of different places.

Congratulations, you know a lot of people and is omnipresent.

But anyway, thank you for your suggestion.
ASI CamCopter, BH Hanson Zenoah 300 RC 3D MAX, MAH 850mm (Version with all options)
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04-10-2013 06:27 PM  6 years ago
BeltFedBrowning

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Kansas City

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Unsubscribed. Good luck
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