HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Dec 28, 2012, 03:53 PM
Registered User
Joined Apr 2005
201 Posts
Discussion
Do the retracts on a H9 P-47 really need 260 oz of torque?

Hey guys. I got a .60 size H9 P-47 for Christmas and the manual recommends the JR 791 retract servo. It's $59 and produces 260 oz of torque. Is that really necessary? Seems like overkill to me. This is the first plane I've had that uses retracts but I can pull the linkage pretty easily by hand. Is the high torque just to keep them from collapsing on touch down? How much torque do I really need? Thanks!
xray328 is offline Find More Posts by xray328
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 28, 2012, 06:10 PM
Registered User
United States, NJ, Frenchtown
Joined Mar 2003
9,107 Posts
The cheapest L G set by GWS all have a simple locking mechanism. No kick back force to the servo.

Decent gear has that feature.

Hook up a standard sized servo . I would test it with a weaker one. Rather ruin a servo.... than brake the wing spars.

I think the overkill is a typo error..

Did you notice the >>>>>>>>>>>>Do not use 6.0 volts....................... ?? Has to be a very old servo. Go with something that can handle 6 volts or better

On the web site they do state that it has fully locking up & down positions for the servo.........O K.....As they state you MUST CAREFULLY adjust the servo arm hole / throw and the rod . ...........Click on their Resources Tab of the plane...

You now know how strong of a servo you will need. Enjoy

Rich
cyclops2 is offline Find More Posts by cyclops2
Last edited by cyclops2; Dec 28, 2012 at 06:27 PM.
Reply With Quote
Old Dec 29, 2012, 05:45 AM
Registered User
Kansas City
Joined Apr 2010
632 Posts
Spectrum has a retract servo that you can adjust the speed and end point. I think it's the AR 2000. The torque is for moving the gear while in the airstream. The servo has a locking device in the extended and retracted positions; servo torque has nothing to do with it. I have used both types, and the Spectrum is my first choice. I thinks it costs less than $30.
Lifer is offline Find More Posts by Lifer
Reply With Quote
Old Dec 29, 2012, 06:56 AM
Registered User
United States, NJ, Frenchtown
Joined Mar 2003
9,107 Posts
Lifer

That sounds great, if it does both. Saves a lot of needless seperate pieces & wires jumbled up.

Ray

Maybe you hold off till all the landing gear servos are posted ?

Rich
cyclops2 is offline Find More Posts by cyclops2
Reply With Quote
Old Dec 29, 2012, 07:15 AM
Registered User
United States, NJ, Frenchtown
Joined Mar 2003
9,107 Posts
Web surf

Adjustable landing gear servos.

Lots of postings about different types of operation & the pluses & negatives of each type.

Interesting
cyclops2 is offline Find More Posts by cyclops2
Reply With Quote
Old Dec 29, 2012, 11:24 AM
Registered User
Joined Apr 2005
201 Posts
Looks like its the A7000...very cool:

http://www.spektrumrc.com/Products/D...odID=SPMSA7000
xray328 is offline Find More Posts by xray328
Reply With Quote
Old Dec 29, 2012, 04:38 PM
Registered User
V2rider's Avatar
USA, MD, Hagerstown
Joined Jun 2009
3,310 Posts
Quote:
Originally Posted by xray328 View Post
Looks like its the A7000...very cool:

http://www.spektrumrc.com/Products/D...odID=SPMSA7000
Love it. As much as I dislike mechanical retracts I think i may have to give these a chance. I thought I was going to have to wait for the new Robarts and pay through the nose.
V2rider is online now Find More Posts by V2rider
Reply With Quote
Old Dec 29, 2012, 07:33 PM
2 Fast 2 Low & 2 Loud
scootrb4's Avatar
United States, CA, Winchester
Joined Nov 2011
3,104 Posts
I grabbed one myself I have a couple of builds in the pipe. I try it on one. Thanks
scootrb4 is online now Find More Posts by scootrb4
Reply With Quote
Old Dec 30, 2012, 06:11 AM
Registered User
Kansas City
Joined Apr 2010
632 Posts
Thanks for locating the right name! In any case, they look really great on a 5 second cycle. Best regards!
Lifer is offline Find More Posts by Lifer
Reply With Quote
Old Dec 30, 2012, 12:22 PM
Registered User
Joined Apr 2005
201 Posts
Got one yesterday. Apparently my Futaba 7CAP doesn't support servo speed....
xray328 is offline Find More Posts by xray328
Reply With Quote
Old Dec 30, 2012, 12:55 PM
2 Fast 2 Low & 2 Loud
scootrb4's Avatar
United States, CA, Winchester
Joined Nov 2011
3,104 Posts
Quote:
Originally Posted by xray328 View Post
Got one yesterday. Apparently my Futaba 7CAP doesn't support servo speed....
You can get an inline potentiometer to slow servo speed
scootrb4 is online now Find More Posts by scootrb4
Reply With Quote
Old Jan 01, 2013, 07:22 PM
Registered User
ncflyer79's Avatar
United States, NC, Marion
Joined Jun 2011
766 Posts
Just get a set of electric retracts for the FMS 1700mm thunderbolt and some 5mm struts and drop in to use. Easy to do and will beat the mechanical retracts all to crap. Awesome plane and is my goto Sunday flyer
ncflyer79 is online now Find More Posts by ncflyer79
Reply With Quote
Old Jan 15, 2013, 03:16 PM
1.21 Gigawatts!
Steph280's Avatar
Irvine, CA, USA
Joined Oct 2000
7,494 Posts
I tried that spektrum servo, as well as the Hitec HS75, JR RT88 and Futaba 136G, only the JR791 was able to pull up the wheels reliably every time. With the other ones you'd have to put the plane into an inverted stall, cut the power, flip the switch while plane is inverted, then the wheels will retract.

This is the same also for my H&M FW-190 and Spitfire. 3 years of weekend flying and hasn't failed me yet. Who says mechanical retracts are not reliable?
Steph280 is offline Find More Posts by Steph280
Reply With Quote
Old Jan 15, 2013, 06:19 PM
Registered User
United States, TX, Leander
Joined Sep 2003
2,580 Posts
I have 7 years on my mechanicals, using JR791. Got three planes with them installed. The Hitecs I tried at first kept stripping gears.
Edwin
edwin1 is online now Find More Posts by edwin1
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion My H9 P-47 retracts are making some sounds lwalton Fuel Warbirds 12 Sep 16, 2011 10:32 PM
Discussion setscrew for a H9 p-47 retracts. Thrawn150 Electric Warbirds 0 Jul 02, 2010 12:37 PM
Wanted H9 P-47 Retracts - 150 size 70 Inch Bird 3DTRYER Aircraft - General - Miscellaneous (FS/W) 0 Feb 25, 2010 05:40 PM
For Sale Century Jet Retracts for H9 P-47 60 Size rdrude Aircraft - Fuel - Airplanes (FS/W) 2 May 02, 2009 08:13 PM
For Sale WTS:Lower Price NEW H9 P-47 Retracts - 150 size 80 Inch Bird $65 LBJ Aircraft - General - Miscellaneous (FS/W) 2 Mar 21, 2009 09:11 PM