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Old 12-10-2009, 08:14 PM   #21
Randy Brown
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Re: Need Some advice

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And who the one that said to put 85oz servos on it.. Get a Grip

Originally Posted by luv2flyrc View Post
Don't worry Randy, nobody's flying anywhere near your cave.

You can run 1000 oz/in on each aileron if you want. The fellow asked what the minimum requirement was. I have owned and flown 2 35% Cardens, and 2 1/3 H9's (close to 100cc size) with 2x 8231's (88oz/in @4.8v) on each aileron and they are more than fine, including 3d flight. I now use 8411's because I'm more comfortable with the metal gears and are rated at about 150oz/in.

Mike McConville himself has run the 8231's as they were the first JR digital on the market.

I've also run single JR8411's on each elevator of my 35% 's with no problems.

The 200 oz/in Digital servo's have been around for 3 maybe 4 years. What do you think we were running on the big planes before that?

You might remember JR 4721's -120oz/in analog servo so, don't mislead people by telling them that 400oz/in is the minimum on a 35% plane geesh!

My appologies for the pissing match , Randy always seems to bring out the best in people

Randy Brown
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Old 12-11-2009, 08:20 AM   #22
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Re: Need Some advice

I just love a good pissing contest
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Old 12-11-2009, 12:04 PM   #23
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Re: Need Some advice

Tx for all your help everyone . After reading all your comments here...... besides doing a little research on my own.... I'm taking your advice and have decided to go with a Jr 8711 on the Rudder , 2 Hitech 7955's on the elevator & 4 Hitech 7955 's on the Ailerons . Spending more money than I would like to BUT its money well spent !
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Old 12-11-2009, 12:48 PM   #24
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Re: Need Some advice

Excellent choice!

That's almost identical to my set-up on a 35% Dalton. Only diff...... I've got 2 7955's on my rudder. 200 flights and ZERO issues with servos and the performance is fantastic.

As a comparison, my H9 35% 260 has 5955's on elevator, 5965's (I think) on ailerons and one 8711 on rudder. Elevator and rudder are fine and I thought the aileron's were fine until I started flying the Dalton. I CAN feel the difference of the higher power servos. The 5965's also developed considerable slop fairly quickly. I stripped one and have since replaced all the gearsets.

My point....... a gazillion oz/in's of torque may not be necessary and with today's servos it's probably easy to go "overkill" as you say but, in the grand scheme of things, it's not that much more expensive for the additional insurance/safety. My research led me to believe that the $ difference in going the "overkill" route was about $200. When you've got several thousand dollars in the plane, that doesn't seem like much.

You also asked about batteries. IMHO, here is where it seems that a lot of people go overboard as well. When setting up my H9 (my first 35%), I did a lot of research and found a variety of types, sizes etc, etc, etc. I ended up going with 2- 2100mAh 2cell lipo's. For the first 50 or so flights, I carefully monitored flight time vs capacity used. I found that, typically, a flight used up about 150-200 mAh's from each battery. Typical 10 min flight, lots of IMAC and some pitiful 3D stuff as well. I typically fly 4 or 5 flights before charging. 5 flights, 200mAh's per batt, per flight, I'm still only using 50% of the batter capacity. As far as current delivery, these are 20C batteries so they're capable of delivering ~40amps. If my servos/Rx are pulling 40amps, I've got bigger problems FWIW, both my 35%'rs are set-up the same way. Combined, ~500 flights with no battery issues.

Throttle, Choke servo....... I'd skip the choke servo. It's just added weight and it should be easy to set up a simple pushrod to manually set the choke. For the throttle servo you want to go with metal gears, quick and fairly strong. Analog/digital........ either way will be fine.

Fibre optic kill switch, I'd recommend the Smart-Fly unit. Small, light, easy to install and relatively inexpensive.

Another consideration is power delivery to servos. What works best for you might depend on your radio. If you're running a 14MZ my recommendation would be different than if you're running a 6EXA

OK, that's enough from me.


Last edited by Dave_ORCC; 12-11-2009 at 07:54 PM.
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Old 12-11-2009, 03:30 PM   #25
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Re: Need Some advice

In my Quique's 102" Yak powered by a 100cc, I have been using Futaba 9156 all the way around and for my flying style, I am using two 9156s in the rudder. It's a well proven setup that works awesome.

My two cents,

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Old 12-11-2009, 04:41 PM   #26
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Re: Need Some advice

Call 911 for free advice not Randy

Last edited by Larry Pierce; 12-11-2009 at 04:47 PM.
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Old 12-11-2009, 04:49 PM   #27
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Re: Need Some advice

I concur 100%
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