1oo 1nch ounces enough power for flaps 85" Thunderbolt W/ZDZ-80  
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All Forums >> RC Airplanes >> RC Warbirds and Warplanes >> 1oo 1nch ounces enough power for flaps 85" Thunderbolt W/ZDZ-80
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1oo 1nch ounces enough power for flaps 85" Thunder... - 11/8/2005 8:40:47 PM   
ramcfarland



Posts: 3173
Joined: 11/4/2002
From: Waldorf , MD, USA
Status: offline 		Select a Pr. of servos for an 85" 47 ZDZ-80 powered -----I would like to use non-digital servos on this function ; but they must have the torque to hold the individual flap open in the event of a missed approach and the need to add POWER and go around while "fumbling to raise the flaps once I find the switch

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< Message edited by ramcfarland -- 11/10/2005 1:55:02 AM >

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Fast Richard
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RE: ADVISE wanted select flap servo for ZDZ-80 power G.... - 11/8/2005 10:45:45 PM   
Jetjockgb


 

Posts: 855
Joined: 3/12/2004
From: ChelmsfordESSEX, UNITED KINGDOM
Status: offline 		Hi ramcfarland,

I have been using Futaba S3305's on my Ziroli T Bolt,great servo{8.9kg Torque at 6 volt's,Metal Gears}

Cheers Graham
WWW.TIGERMODELS.NET

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(in reply to ramcfarland)
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RE: ADVISE wanted select flap servo for ZDZ-80 power G.... - 11/9/2005 1:11:46 AM   
ramcfarland



Posts: 3173
Joined: 11/4/2002
From: Waldorf , MD, USA
Status: offline 		Looked at your sight -----A OK+++++++ Un fortunately I have a radio that is not "readily" adaptive with Futaba plug,with out removing a tab on the connector. My current radio which I like is the JRXP9303 Tx. and the matching JR PCM Rx.

I was thinking there might be be a High Tech servo one of you all would recommend when using a comparable gas engine to the ZDZ 80-> used for Flaps<---My chief concern is that: under certain flight conditions, I have and could again, be in a a go around after a missed landing approach with full flaps still deployed and the throttle opened up after a missed approach before I can raise the flaps,with subsequent 'Blow back,'that would be considerable I believe-I


I've replaced metal and nylon gears in my Hi Tech 81 MG servos operating my one seventh scale P-47 Powered by an O.S. 120 4/C W/pump that appears in the War Bird Gallery here at War Birds dot..


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Fast Richard

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RE: ADVISE wanted select flap servo for ZDZ-80 power G... - 11/9/2005 1:34:28 AM   
warbird_1



Posts: 802
Joined: 2/5/2002
From: perry, NY, USA
Status: offline 		i really don't see a big problem with blowback on those flaps. i would get 2 hitech, say 100 oz. "standard size" or better servo's for them , you'll be fine. even at full throttle you should be ok . i prefer to use the hole on the servo arm that is the nearest to the center. that way you'll get the max torque and a lot less risk of stripping gears. why don't you like digital servo's they are great . warbird_1

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RE: ADVISE wanted select flap servo for ZDZ-80 power G... - 11/9/2005 2:52:20 AM   
ramcfarland



Posts: 3173
Joined: 11/4/2002
From: Waldorf , MD, USA
Status: offline 		I will have digitals on all the flight controls probably JRs latest the JR8611A version . I will look into Hi Tech at 100 Inch Ounces for the flaps and use the "inner whole," thanks.

< Message edited by ramcfarland -- 11/10/2005 1:52:32 AM >

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Fast Richard

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RE: 1oo 1nch ounces enough power for flaps 85" Thu... - 11/10/2005 2:01:04 AM   
ramcfarland



Posts: 3173
Joined: 11/4/2002
From: Waldorf , MD, USA
Status: offline
will you all you all give me some serv types s you would use for G.S.Thunderbolt with say a G-62 then.I have an 80--- I know we have a few of the G-62 powered T.F. 85" span P-47s just reading threads here at War Birds.com

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Fast Richard

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RE: 1oo 1nch ounces enough power for flaps 85" Th... - 11/10/2005 2:24:30 AM   
t_burley



Posts: 2577
Joined: 1/11/2002
From: Bakersfield, CA, USA
Status: offline 		Hitec 645MG. around 130 ozs of torque

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Todd
Meister, Aero Acc., Sierra, Glennis, Get Stencils, Shinden, Warbird Colors, Fliteskin customer

(in reply to ramcfarland)
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RE: 1oo 1nch ounces enough power for flaps 85" Th... - 11/10/2005 4:49:07 AM   
ramcfarland



Posts: 3173
Joined: 11/4/2002
From: Waldorf , MD, USA
Status: offline 		Thanks Todd I will check with my hobby shop

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Fast Richard

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RE: 1oo 1nch ounces enough power for flaps 85" Th... - 11/10/2005 5:05:19 AM   
t_burley



Posts: 2577
Joined: 1/11/2002
From: Bakersfield, CA, USA
Status: offline 		your welcome Richard. these are great servos for the price. typically
around 35-40.00 each.

metal geared, hi torque

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Todd
Meister, Aero Acc., Sierra, Glennis, Get Stencils, Shinden, Warbird Colors, Fliteskin customer

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RE: 1oo 1nch ounces enough power for flaps 85" Th... - 11/10/2005 2:21:11 PM   
carlbecker



Posts: 1635
Joined: 7/29/2002
From: Fairfax, VA, USA
Status: offline 		I use two 70 in ounce servos for each flap (tried to spread the load) in my 30 pound Wildcat with a Saito 450 (close to a G62). The Hitec 645 would do great. I try to use all the travel of the servo for what ever travel I need in the surface. Never works out that way but you get better resolution. I would think with that much power you would not put the pedal to the metal. Flaps will give lots of drag and lift and I just go at about 1/2 throttle on a go around with less power to weight than you have.

You are looking good Richard!

Carl

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RE: 1oo 1nch ounces enough power for flaps 85" Thu... - 11/11/2005 4:39:04 AM   
paladin


 

Posts: 1609
Joined: 2/13/2002
From: Vestal, NY, USA
Status: offline
Carl,
I go to the site below:

http://www.morgantech.com/Servo%20Torque%20Caculator.htm

I normally want to be well bellow 70mph before deplying the flaps. But I want to be able to know they will come down reliably well above manuver speed (so I aim for 70mph).

sufrace max deflection is 45 to 50 degrees. I usually set the linkage up for 50 but only plan to use 45 degrees.

For servo throw think about this. Standard full throw is 60 degrees. on radios that allow 120 % of movement servo movement is 72 degrees. on those with 150% servo movement can be 90 degrees. This is very important in reducing the stress on the servo.

My IMP macchi ( my latest project) is set up for 45 degrees of flap movement, 90 degees of servo movement and that stalls the flap servos I have in it at about 73mph.

Joe



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(in reply to ramcfarland)
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