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Home✈️Aircraft🚁HelicopterBeginners Corner › Raptor 37. Vibrations.
05-02-2020 10:28 PM  32 days ago
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MikeHeal

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California

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Raptor 37. Vibrations.
Hello guys,
Thanks for having me here.
I have an inherited Raptor 37, it gives a lot of vibrations on upper wings on startup as if it will fall sideways, but once rotation speeds up the vibration reduces and it flies okay.
What could be the problem!
I am new to the rc helicopter world.

Thanks a ton
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05-02-2020 10:38 PM  32 days ago
JuanRodriguez

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The Villages, Florida

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Your blades might be too loose ..... once they spool up and straighten out , all is ok .....

Also , are you trying to lift off from pavement ?? If so , move to a grassy area and try that ....
Been there, done that and old enough to know better.....
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05-02-2020 10:50 PM  32 days ago
MikeHeal

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California

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Thanks @Juan
When I try to hold the helicopter from the base (while it is airborne) I still feel some vibrations though.
How to tighten up the blades? .. just tighten up all the small screws!
I am flying it from a leveled carpeted floor.
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05-02-2020 11:17 PM  32 days ago
JuanRodriguez

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The Villages, Florida

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Oh my !! You’re not trying to hold the heli overhead while it’s spooled up , are you ??? That is extremely dangerous !!! Also extremely dangerous is strapping a heli to a hard surface and then spooling it up to attempt adjustments .

Do yourself a favor ..... STOP what you’re doing and find an experienced pilot to help you with your setup !!!
Been there, done that and old enough to know better.....
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05-02-2020 11:29 PM  32 days ago
MikeHeal

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California

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No no, that was just once.
Experienced pilot! .. ok I’ll try to search for them.
Thank you for the reply.
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05-02-2020 11:58 PM  32 days ago
JuanRodriguez

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The Villages, Florida

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Once and you survived !! Great !! Please, don’t press your luck again !!!Been there, done that and old enough to know better.....
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05-03-2020 12:48 AM  32 days ago
Rockin Bird

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St Gabriel, La

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Another one saved .That sweet smell of "Nitro"
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05-03-2020 01:34 AM  32 days ago
MikeHeal

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California

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I don’t understand. Saved! Will it cut my hand or something?
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05-03-2020 01:38 AM  32 days ago
JuanRodriguez

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The Villages, Florida

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MikeHeal I don’t understand. Saved! Will it cut my hand or something?
I guess that you don’t understand..... folks have been killed by model helicopters...... please don’t think that these are “toys” and treat them with the respect they deserve......
Been there, done that and old enough to know better.....
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05-03-2020 01:55 AM  32 days ago
MikeHeal

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California

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I see.
Thanks for heads up. I’ll Be more careful .
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05-03-2020 02:14 AM  31 days ago
Rockin Bird

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St Gabriel, La

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Mike ,its not a joke. Even pilots with experience get hurt, or even killed. Take it seriously each and every time you adjust anything with your settings, and make sure there are no animals or kids around when you get it up for testing. Get to know your helicopter. Be safeThat sweet smell of "Nitro"
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05-03-2020 02:31 AM  31 days ago
spaceman spiff

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Tucson

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Don't forget to check tracking of the blades. Mark the leading edge of one of them with a thin tape of contrasting color. White works well with carbon blades... if you see the marked color higher than the unmarked blade, adjust the linkage of one of the blades... Also check balance.
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05-03-2020 09:42 AM  31 days ago
Helicop50

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Australia

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Please find and go to your nearest heli club,I'm sure someone will help you and also advise you on the safety aspect, you were very lucky the first time.
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05-03-2020 12:29 PM  31 days ago
Rockin Bird

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St Gabriel, La

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Spaceman,the lower of the two is the blade you raise, correct?That sweet smell of "Nitro"
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05-03-2020 03:21 PM  31 days ago
gorhambirds

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Hickory Hills Illinois, usa

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All helicopters may experience a slight vibration on spool up. It’s called ground resonance and is felt in full size helicopters. Many things can cause this especially the lead/lag out of alignment. However, if there is an imbalance vibration at a lower rpm, it does not go away at flight rpm. It may appear to but what happens is the vibration frequency becomes just too high for the naked eye to easily detect. That high frequency is the worst kind of vibration is it is the type that foams fuel, ruins electronics, and over time, fatigues airframes.

To do a thorough balance, first, check your machine for any defective parts: bent main or feathering shafts. If all good, check the EXACT centering of the fly bar and paddle alignment, if your Heli has one. If so, run up the head with just the fly bar assembly and no blades. If it doesn’t run smooth and in balance without the blades, correct that first. Generally, if you followed the above steps EXACTLY, it should spool up smoothly. If not, use fly bar weights to adjust.
Next do a static balance on the main blades using a quality balancer. DO AS GOOD A JOB AS YOU CAN HERE. ACCURACY COUNTS. Mount the blades to the heli, run them up, and track them. If you still have vibration, swap both blades from side to side, run them up, and track them again. If you STILL have vibration, then a trial and error dynamic balance of the blades is needed. This is done by applying a one inch wide piece of balancing tape around the CG (center) of one blade. Run up the head and check for vibration. If it’s worse, apply the tape to the other blade and repeat. If better, experiment by moving the tape inward towards the root or outward towards the tip running up the head each time until the vibration is gone, or at least at a minimum . If you’re running a flybarless head, simply skip the steps regarding the fly bar and start with just the main blade steps.
Lastly, keep in mind, if you are running the older wooden blades, sometimes, due to constantly changing moisture content and wood density, they can be near impossible to get running smooth. I have a pair of Shuttle blades that were retired right out of the box, never having been flown, due to their inability to balance. It happens sometimes. That’s why I gave up on woodies a long time ago (except on my Cricket). A quality pair of glass or carbon blades goes a long way to curing balancing issues by not having them in the first place.
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05-03-2020 03:27 PM  31 days ago
MikeHeal

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California

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Thanks @gorhambirds
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