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HelicopterThunder TigerOther › Carbon fins
03-08-2006 12:58 PM  11 years agoPost 1
300wby

rrVeteran

Columbia City, Indiana

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I put these spiffy fins on my R50 and now it is nose heavy, enough that it will rapidly start foward movement from a hover. The rear of the skids are about an inch off the table when picked up by the flybar, it was only 1/4 inch with the plastic fins. Now I have to figure out how to correct the CG, I removed the flange around the inside edge of the canopy but wasnt enough weight to correct the problem. I dont want to use alot of trim or mechanical adjustment to solve this, maybe a lighter canopy. Any suggestions?

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03-08-2006 01:40 PM  11 years agoPost 2
AlabamaRaptor

rrApprentice

Millbrook, AL (Montgomery area)

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Checking the CG


Raptor Titan 50 -- OS .50 Hyper -- Futaba 7C 2.4GHz

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03-08-2006 02:01 PM  11 years agoPost 3
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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Is your tail servo on the boom?

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03-08-2006 02:01 PM  11 years agoPost 4
300wby

rrVeteran

Columbia City, Indiana

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Thanks, but I know how to check it. I need ideas on how to reduce the weight up front because of the lighter tail fins. No the tail servo isnt on the boom, I would rather not put it there.

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03-08-2006 02:55 PM  11 years agoPost 5
colsy

rrElite Veteran

Cambridge, UK

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What batteries are you using,, i have had same problem even with a tail mounted servo, changing my RX supply to 2s1p with duralite regulator solved my C of G, i to like them without trim..
Note: i have a metal collective tray.
Colin............

Only Quote From Experience.

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03-08-2006 03:17 PM  11 years agoPost 6
300wby

rrVeteran

Columbia City, Indiana

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Mines all stock except the fins. I have a sub c pack at 6V.

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03-08-2006 06:20 PM  11 years agoPost 7
AlabamaRaptor

rrApprentice

Millbrook, AL (Montgomery area)

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my bad

Reducing the CG:
- if you do not have tail mounted rudder servo, consider moving it either on the frame via a CF mount or moving it to the boom
- with the sub C pack at 6v, consider running at 4.8v (I do know that some gyros highly recommend using 4.8v vs 6v for the rx; I know the Futaba GY401 manual says to use only a 4.8v pack and to avoid the 6v packs
- last resort => make lead weights using the fuel bottle tops (the red seal under the cap) and add some epoxy with lead fishing weights. This makes a nice looking weight that can be painted and mounted just about anywhere on the heli. Once the epoxy dries, just pop it out of the red cap.


Raptor Titan 50 -- OS .50 Hyper -- Futaba 7C 2.4GHz

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03-08-2006 06:24 PM  11 years agoPost 8
300wby

rrVeteran

Columbia City, Indiana

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I considered changing the batt. I also thought of the lead, could epoxy some on the edge of the fin.

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03-08-2006 06:59 PM  11 years agoPost 9
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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One way to move the CG back on an R50 is to buy Mr Carbon or some other brand of CF boom supports. While these CF supports are slightly lighter than stock, they usually come much longer than needed, permitting you to move the horizontal fin and holder back on the boom. Made a big difference for me. Look cool too.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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03-08-2006 07:17 PM  11 years agoPost 10
300wby

rrVeteran

Columbia City, Indiana

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Thanks, I hadnt considered that.

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03-08-2006 09:27 PM  11 years agoPost 11
Rappy30

rrApprentice

South Riding, VA - US

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correcting balance

go to lowes/home depot/sears etc....buy a few fender washers in various sizes. Now place one under the rear carbon fin and reattach the fin, check balance. add more washers as necessary. I say use fender washers due to thier large OD and small ID, various sizes will give you a pretty good weight and they are not hard to mount at all. Use under the vertical fin (between the fin and tail housing) since this is as far back as you can get and will use the least weight to balance the heli.

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03-08-2006 10:37 PM  11 years agoPost 12
300wby

rrVeteran

Columbia City, Indiana

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Thanks, good thinking.

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