4*60 cg
05-23-2009, 01:14 PM
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4*60 cg
Hi all newb here just finishing first kit a 4*60 . Needing to add weight to get CG correct (tail heavy) would it be ok to add weight to the bottom of the motor mount just in front of the motor and behind prop Thanx Max
05-23-2009, 01:34 PM
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RE: 4*60 cg
ORIGINAL: maxwell 1
Hi all newb here just finishing first kit a 4*60 . Needing to add weight to get CG correct (tail heavy) would it be ok to add weight to the bottom of the motor mount just in front of the motor and behind prop Thanx Max
Hi all newb here just finishing first kit a 4*60 . Needing to add weight to get CG correct (tail heavy) would it be ok to add weight to the bottom of the motor mount just in front of the motor and behind prop Thanx Max
05-23-2009, 03:41 PM
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RE: 4*60 cg
Max,
You might consider buying a new motor mount and relocating the engine more forward. The lighter the better. What ever you do do not put a heavy brass prop nut on it. It puts excessive loads on on the engine bearings during quick turns.
Jim Clausen
You might consider buying a new motor mount and relocating the engine more forward. The lighter the better. What ever you do do not put a heavy brass prop nut on it. It puts excessive loads on on the engine bearings during quick turns.
Jim Clausen
05-23-2009, 05:31 PM
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RE: 4*60 cg
Jim's advise is good. Your idea of weight on the front of the motor mounts is also a good idea. weight on the firewal is not as effective in balancing, so you will require more weight.
I have built and flown two of the 4*60's and both were tail heavy. The second wasn't quite as bad. I used the stock motor mounts with 5/8"sq x the height of the mount of steel and bolted the mount to the firewall using this as a spacer. This was about 6 oz of steel. On the second, I used the Dubro vibration mounts and this moved the motor even futher forward than the spacers. I still needed a couple oz more and Imade a bar of 1/8 thick lead about1" wide shapped in a U with tabs on bot h of the uppers that I drilled for the motor screws. I thread my motor mounts rather than use nuts, so I just used a longer screw on the front two and then adde a flat washer and a nut with thread lock. That and moving the battery as far forward as possible put it in good balance.
Don
I have built and flown two of the 4*60's and both were tail heavy. The second wasn't quite as bad. I used the stock motor mounts with 5/8"sq x the height of the mount of steel and bolted the mount to the firewall using this as a spacer. This was about 6 oz of steel. On the second, I used the Dubro vibration mounts and this moved the motor even futher forward than the spacers. I still needed a couple oz more and Imade a bar of 1/8 thick lead about1" wide shapped in a U with tabs on bot h of the uppers that I drilled for the motor screws. I thread my motor mounts rather than use nuts, so I just used a longer screw on the front two and then adde a flat washer and a nut with thread lock. That and moving the battery as far forward as possible put it in good balance.
Don
05-23-2009, 09:49 PM
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RE: 4*60 cg
I added try stock on the out side of the fire wall as well as the inside. At least it wasnt dead weight, I have also added weight on the fuselage side front.
05-24-2009, 06:34 PM
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RE: 4*60 cg
Would it be possible to buy your instruction manual for the 4-60? My dog ate mine (seriously a chocolate lab at 3 mos.). If not , maybe you have a suggestion as to where I might be able to find one? Thanks!
Clint Grant
Clint Grant
