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HelicopterScale Model RC Helicopters › Funkey Agusta headspeed help
09-17-2007 03:15 AM  10 years agoPost 1
patty48

rrApprentice

Gippsland , Australia.

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Hey Guys.
Can someone help me out here ?I’ve got a funkey 50 size Agusta with Sceadu mechanics and I can only run a head speed of 1400, any more speed than that and the whole fuselage shakes like mad it looks like its gonna blow up so when flying at that head speed it fly’s like crap!
Any help would be great guys.
Patty

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09-17-2007 06:21 AM  10 years agoPost 2
patty48

rrApprentice

Gippsland , Australia.

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MMMMMMMMMMMMMM looks like its got all you guys stumped to hey
Patty

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09-17-2007 06:46 AM  10 years agoPost 3
ben1101

rrApprentice

Australia

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Look at your head and make sure its all balanced and your main shaft is straight, add foam padding around places like the tail gearbox to reduce the fuses ability to vibrate, check the mounting to the fuse etc. Goodluck

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09-17-2007 07:43 AM  10 years agoPost 4
WIRLYBIRD

rrVeteran

CAPE TOWN / SOUTH AFRICA.

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I squirt that foam in a pressure can , up the tail boom not only does it hold the parts nicely in place but cuts all vibration to the outer most part of the boom!!

WHAT GOES UP MUST SURELY COME DOWN.

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09-17-2007 08:36 AM  10 years agoPost 5
Surri

rrNovice

Nidwalden, Switzerland

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Nice ship :)

The level of fuselage vibration is based on the method of how (hard / soft) the mechanics is being mounted to the fuse. Try to find out where the vibrations are "initiated" and which fuselage section is just "following". If you spool up very slowly you will be able to answer this question. With this information, you will be able to decide how to address the vibrations > additional mounts or optimize hard / soft mount.

Based on my experience, best practice is too hard mount the mechanics to the bottom of the fuselage; soft (or hard for very long tails) mount the tail rotor assy to the rear end of the tail cone and soft mount the anti rotation bracket to the top fuselage.

Last but far from least, I guess the definition of hard mount is widely understood, but soft mount does not mean any kind of foam (....can be used in toys), but to install a firm mechanical connection with a build in rubber damping device.

Hope this helps.

Cheers - Surri

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09-17-2007 04:53 PM  10 years agoPost 6
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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yeah like mentioned above make sure the tail gearbox is mounted to the fuselage back there. it may also be necessary to brace the mechs and the top section of the fuse as well.

drive a rotary, fly a rotorcraft

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09-18-2007 12:20 AM  10 years agoPost 7
torque

rrKey Veteran

bolivia , north carolina

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how did the mechanics fly before you put them in the fuselage? i guess you flew it and it flew well before you installed the mechanics in the fuselage.

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09-20-2007 12:21 AM  10 years agoPost 8
patty48

rrApprentice

Gippsland , Australia.

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Hey Guys
The mechanics are hard mounted to the base of the fuselage ive laid a sheet of carbon fiber for strength to the base because they are very thin from new!! , it seems on this model you can’t brace the mechanics to the fuselage because the whole front & side comes off, so there is really no mounting points it would be good if I could .the tail gear box is mounted with a foam ring that comes with the kit and its very tight there is no movement back there at all.
The shakes start in flight not on spool up it seems when I fly it I need to be careful how much throttle I input, if I keep to a low rev it works, if I give it more power it starts shaking.
I’ve flown the mechanics many times before as a pod & boom it went great never any problems.
The spray foam sounds like a good idea, I might give that a try.
Still looking!!!
Thanks for your input guys

Patty

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09-20-2007 05:26 AM  10 years agoPost 9
ScaleBrad

rrApprentice

Longwood, FL USA

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Do you have braces from the top of the fuse near where the head is? These are very important and my be your problem. look here for pictures of what I am talking about: http://www.rcgroups.com/forums/atta...chmentid=962739

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09-20-2007 12:31 PM  10 years agoPost 10
patty48

rrApprentice

Gippsland , Australia.

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Hey Brad.
I'll see if i can mount them with the mech i have in it,there must be a way,
Thank's for the link to the pics big help.

Cheers Patty

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09-23-2007 05:20 PM  9 years agoPost 11
ghostrideroo7

rrNovice

perth amboy ,new jersey

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try adjusting your throttle and pitch curves, my bell 222 and jet ranger did the same thing ,it was the curves

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