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Old Aug 19, 2012, 02:03 PM
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renoglowflyer's Avatar
United States, NV, Reno
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Quote:
Originally Posted by Dennis C View Post
Do not worry to much about the CG to start. just get it in the ball park.

If you do move things move hardware, you want the tank as close to the CG as possible so that the CG does not change during the flight

Dennis
Thanks Dennis ... Think I am going to move the pull pull servo. Wish I could leave it there but having it in the tail is probably the best. I bet most people would agree to that? Got 3 flights this morning on the extra and the only thing I kept thinking was where is my slick lol. HAving the servo moved back this can help the batteries maybe sit where the pull pull servo is?
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Old Aug 19, 2012, 02:10 PM
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Manta1's Avatar
USA, GA, Cochran
Joined Jun 2008
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Quote:
Originally Posted by brathanke View Post
You guys are correct about the nominal voltage but the top of the pack is 7.4
i you are correct as well,but it wont stay that high for long
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Old Aug 19, 2012, 02:16 PM
Irg
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yeah, like less than a minute or two.
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Old Aug 19, 2012, 06:29 PM
HIBDON FOR PRESIDENT !!
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Modesto, CA
Joined Nov 2006
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What to do !

Using a specktrum recevier, what is the best way to get backup battery redundancy for the 71" Slick. I have a Fail Safe AR 9100 in my 89 just don't want to put a $200 receiver in this size plane. Also plan on using Tech Aero Ultra IBEC with ignition cutoff.
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Last edited by goflyhighrc; Aug 19, 2012 at 06:39 PM.
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Old Aug 19, 2012, 07:18 PM
3d NOOBular
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USA, UT, St George
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Quote:
Originally Posted by Irg View Post
yeah, like less than a minute or two.
Fair enough but if the servos aren't rated for high voltage is it not enough of a difference to matter? I don't know everything about this so please enlighten me.
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Old Aug 19, 2012, 09:21 PM
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United States, NV, Reno
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Ok felt sad to cut the pull pull set up... So 3DHS set up and life lol... But I have the servo in the tail and it feels more comfurtable for the cg... More places for the batteries
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Old Aug 19, 2012, 09:55 PM
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USA, TX, Spring
Joined Jan 2008
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I just stuck 2 ounces of lead to the back of the servos today to get the gasser to balance and it has two tail servos....that os gt33 is a hog!
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Old Aug 19, 2012, 10:57 PM
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Originally Posted by going4speed View Post
I just stuck 2 ounces of lead to the back of the servos today to get the gasser to balance and it has two tail servos....that os gt33 is a hog!
I am fealing the hog... I got a post to mr smith to find out how they mthotically figured out the GT33 .. They have been busy with the K50 but hopefully we might get a post with a pic how this should run.. If not we find fun places for the batteries
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Old Aug 20, 2012, 04:43 AM
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I'd love to see the Smith's set up also.
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Old Aug 20, 2012, 07:34 AM
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USA, NY, Patchogue
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Quote:
Originally Posted by goflyhighrc View Post
Using a specktrum recevier, what is the best way to get backup battery redundancy for the 71" Slick. I have a Fail Safe AR 9100 in my 89 just don't want to put a $200 receiver in this size plane. Also plan on using Tech Aero Ultra IBEC with ignition cutoff.
We use two 1100 a123's with a smart-fly batt share and 2 JR switches. use about 80mah/flight The batt share will draw the two packs equally
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Old Aug 20, 2012, 06:28 PM
Irg
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Quote:
Originally Posted by brathanke View Post
Fair enough but if the servos aren't rated for high voltage is it not enough of a difference to matter? I don't know everything about this so please enlighten me.
many servos that are good for 6v will be ok on life, but check to make sure.

hv usually denotes at least capable of 7.4v, nominal 2s voltage. but many hv servos can be runner higher, like my 7955s at 8v.
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Old Aug 20, 2012, 06:55 PM
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I didn't have to add any lead. I simply put two 2000mah life packs under the turtle deck (like many other gassers on this thread), and it balanced out slightly tail heavy at stock cg. Two servos in tail, rudder & elevator. Moved ignition and everything as far back as possible. No spinner, no lead.
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Old Aug 20, 2012, 08:02 PM
220lb of Canned Heat, baby
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ghetto subscribe
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Old Aug 20, 2012, 08:56 PM
3d NOOBular
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Quote:
Originally Posted by Irg View Post
many servos that are good for 6v will be ok on life, but check to make sure.

hv usually denotes at least capable of 7.4v, nominal 2s voltage. but many hv servos can be runner higher, like my 7955s at 8v.
Thanks for the clarification
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Old Aug 21, 2012, 06:00 AM
customstandoffs
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USA, AL, Madison
Joined Dec 2007
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Quote:
Originally Posted by Irg View Post
many servos that are good for 6v will be ok on life, but check to make sure.

hv usually denotes at least capable of 7.4v, nominal 2s voltage. but many hv servos can be runner higher, like my 7955s at 8v.
HV denotes that it can run on a 2S LiPo unregulated which is 7.4 nominal and 8.4v max.

HS7955's aren't actually marketed as HV rated servos but consumers have proven that they are capable of handling 2S LiPo power unregulated.

LiFe is 6.6v nominal and I'm not sure what it maxes out at but it settles back down to around 6.6v pretty quickly and stays there until it's dead. I've been running my HS985MG's on unregulated A123 without issue. Actually, I normally set my BEC's to 6.5 or 6.6volts on most all of my servos except my 7955's which I run at 2S LiPo unregulated.
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