START HERE |
|
Register | FAQ | PM | Events | Groups | Blogs | Calendar | Mark Forums Read |
Unregistered
|
MA Gas Miniature Aircraft Gas Helicopter Support Forum |
|
LinkBack | Thread Tools | Display Modes |
06-05-2013, 08:25 PM | #1 (permalink) |
Registered Users
Join Date: Apr 2011
|
Whiplash Gas Question. Tail rotor grip/hub balance issue:
While putting my Whip Gas together, I noticed that the whole tail hub and grip assembly was not very well balanced at all.
My question is: Have many others noticed this? If so, how bad was it for you? It's not a deal breaker but I am having to put a fair amount of CA on one blade just to get them the whole tail assembly to balance out. I know there are going to be differences in metal density and tiny variations from machining tolerances, however just not sure what is/would be acceptable. Hypothetically speaking; If/When you discovered that your hub and grips were out of balance would you: 1. leave it alone and only add weight to a blade? or 2. Remove a little bit of material from the very outside tip of the blade grip? Providing of course there was plenty of material left between the bolt hole and the edge. If left to adding weight to one blade, would adding any more than a gram or two be deemed unacceptable? Cheers |
Sponsored Links | |||
Advertisement |
|
06-05-2013, 08:46 PM | #2 (permalink) |
Registered Users
Join Date: Nov 2008
|
Both of my hubs were OK, but if I found them out, I would pull the hub, remove blades and balance the hub and grips on a prop balancer.
__________________
Tom TRM Power CAUTION - my posts are based on my experiences, yours may be different. |
06-05-2013, 09:13 PM | #3 (permalink) |
Registered Users
Thread Starter
Join Date: Apr 2011
|
Thanks fastflyer20,
Sure, but where would be the best spot to remove material from on the grips? Obviously don't want to alter the structural integrity of the grip. Cheers |
06-06-2013, 09:37 AM | #4 (permalink) |
Registered Users
Join Date: Jun 2005
Location: Houston TX / Bend Or
|
I can't say I have done this for ANY of my helicopters.
That said I am getting a vibration in my Whiplash gasser boom supports. The tail fin however looks fine.
__________________
We had a great country once. You know what made it great? “I can.” Then the weak came along, “the I cant’s” and destroyed it. |
06-06-2013, 09:50 AM | #5 (permalink) |
Registered Users
Join Date: Nov 2008
|
I run a tie piece on the boom supports
The screws on my boom support clamp have been replaced with threaded studs and a nylock nut. This is more robust and makes maintenance easier.
__________________
Tom TRM Power CAUTION - my posts are based on my experiences, yours may be different. |
06-06-2013, 10:49 AM | #6 (permalink) |
Registered Users
Join Date: Jun 2005
Location: Houston TX / Bend Or
|
Do you have a photo you can post.
There use to be several different boom support brace things that you could buy and no one one has them in stack any more.
__________________
We had a great country once. You know what made it great? “I can.” Then the weak came along, “the I cant’s” and destroyed it. |
06-06-2013, 12:16 PM | #7 (permalink) |
Registered Users
Join Date: Nov 2008
|
__________________
Tom TRM Power CAUTION - my posts are based on my experiences, yours may be different. |
06-06-2013, 06:07 PM | #8 (permalink) | |
Registered Users
Join Date: Jun 2005
Location: Houston TX / Bend Or
|
Quote:
I saw those but did know if they would fit the whiplash. If they do I will get a set.
__________________
We had a great country once. You know what made it great? “I can.” Then the weak came along, “the I cant’s” and destroyed it. |
|
06-08-2013, 06:40 AM | #9 (permalink) |
Registered Users
|
A good boom support tie can be made from fuel tube and 2 zip ties. Cut the fuel tube to the distance between the supports, run the ties through it and attach to the supports. Voila, it ties them together and absorbs vibrations.
|
06-08-2013, 09:58 PM | #10 (permalink) | |
Registered Users
Thread Starter
Join Date: Apr 2011
|
Quote:
If not, whack it on a prop balancer and check, then you won't have to guess. you should always check blade balances. Anyway, back to my original question: Does anyone have a suggestion for the best location to remove some hub material? I am guessing more toward the tip as this will give the best leverage point advantage for minimal material removal. Also it will lesson the structural change on metal closer toward the center rotation point where there is the most centrifugal force/fatigue. Cheers |
|
06-09-2013, 08:01 AM | #11 (permalink) |
Registered Users
Join Date: Jun 2005
Location: Houston TX / Bend Or
|
To answer your question, I think I would add tape to a tail blade. I would not remove material from the hub/grip.
You may want to ask this question again in them main forum, just don't say what helicopter it's for or the mods will move back down to the MA sub forum.
__________________
We had a great country once. You know what made it great? “I can.” Then the weak came along, “the I cant’s” and destroyed it. |
Thread Tools | |
Display Modes | |
|
|