Notices
RC Gliders, Sailplanes and Slope Soaring Discuss rc gliders,rc sailplanes and slope soaring in this forum. Thermaling techniques, airfoils, tips, etc

Glider Servos

Old 12-08-2012, 03:28 AM
  #1  
Yank II
Thread Starter
 
Join Date: Jan 2007
Location: Salome, AZ
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
Default Glider Servos

I plan to order a kit of a 110" wing span glider (approx. 5-6 lbs) and I can not find any info on the size of servo (small medium or large) or torque requirements. I plan on spoilers and ailerons. I sent an email to the builder of the kit and got a real sarcastic reply. I am new to gliders and any help would be appreciated. Would the Hitec HS-225MG (54oz-4.8v-66oz-6v) servo's do the job?
Old 12-08-2012, 04:21 AM
  #2  
Tinkrerpilot
Senior Member
My Feedback: (2)
 
Join Date: May 2005
Location: Tacoma, WA WA
Posts: 353
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Glider Servos

Would help if we had more info on the glider. A name , a picture, something. Type of flying you plan on doing. Need more info.
Old 12-08-2012, 08:02 AM
  #3  
ARUP
Senior Member
 
Join Date: Jan 2007
Posts: 2,343
Likes: 0
Received 1 Like on 1 Post
Default RE: Glider Servos

My 118" span scratchbuilt 1/6 scale 1932 BS2 'Balestruccio' will use HS-125MG servos which should be more than adequate for straight and level scale thermaling flight.
Old 12-08-2012, 08:22 AM
  #4  
LovesToSail
Junior Member
 
Join Date: Jun 2005
Location: endicott, NY
Posts: 29
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Glider Servos

The answer is that it depends... I fly 99" to 130" gliders that never see above 40MPH (on motor launch) and only use up to Hitec HS-81 for aileron and flaps (4 servo wing). My RES planes use HS81 but I am moving to HS65 in my next altitude limited electric soaring (ALES) glider.

I have an Airtronics Legend 113" (fastest that I have because it has very high wing loading) that uses all HS81 (metal gear on flaps).

I have generally moved to the Metal Gear for flaps as well as rudder (due to spins on landing which can wipe out the gear train).

For spoilers I use HK tower pro 9gr ($3) servos which have not failed ever. On some it is one installed the fuse pulling strings to spoilers, on others I just put one in each spoiler bay to directly push the spoiler.


Scott
PS - a 5-6lb 110" wing glider is pretty high wing loading.

Old 12-12-2012, 02:54 AM
  #5  
Yank II
Thread Starter
 
Join Date: Jan 2007
Location: Salome, AZ
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Glider Servos

I was talking about the Skybench Big Bird XL. It has a 110" wing span. A member of the club I used to belonged to, had one and it was amazing. I did not think to ask about his set up at the time. Thank you for trying to help.

http://skybench.com/index.html?http:....com/home.html
Old 12-12-2012, 02:52 PM
  #6  
BMatthews
 
BMatthews's Avatar
 
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
Posts: 12,425
Likes: 0
Received 22 Likes on 19 Posts
Default RE: Glider Servos

For the usual wing mounted servos for ailerons and flaps I like to use the biggest and strongest that will fit in the thicker portion of the wing just behind the main spar. That way I'm sure that even with higher speeds the torque will not be an issue. This isn't as critical with the ailerons since those surfaces do not move far. So there's a leverage gain in the relationship between the output arm and the control horn. But for flaps it can be important since you want the flaps to move through more or less a 90 degree range. And on larger surfaces that can require some added torque ability.

In the fuselage for the rudder and elevator pretty much any standard size will do just fine.

Those 225 servos certainly have more torque than needed for either the ailerons or even flaps if you had them. If your next model uses flaps the metal geared 225MG would be a wise choice simply due to the frequency of dragging flaps during landings if not careful. I suspect that most glider guiders are like me and for a regular belly slide landing tend to retract the flaps when the model is passing down through that last foot of air before touchdown simply to avoid the high back load on the flap servos.
Old 12-12-2012, 03:41 PM
  #7  
jetmaven
 
Join Date: May 2002
Location: Fl.
Posts: 372
Likes: 0
Received 1 Like on 1 Post
Default RE: Glider Servos

Hitch 225 MG 's the key to trouble free is MG , hey, it even rhymes . But seriously , hitch servos have served me reliably for years . For just a few bucks more per servo , the metal gear option is the way to go .
Old 12-13-2012, 10:41 PM
  #8  
OzMo
Senior Member
My Feedback: (3)
 
OzMo's Avatar
 
Join Date: Sep 2002
Location: OZark, MO
Posts: 2,694
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Glider Servos

Hitec improved on the 81 series with the 82 series. I have the Big bird XL, your gonna love it! Ray is helpful but sometimes comes accross the wrong way. He is great at kit building but has gotten a bit tired of answering the same questions over and over. (admitedly time consuming) Most people overlook this cuz his products are superb. ALL the info needed for his kit are easy to find. Also look on RCGroups.com

I would use this servo hitec 82mg
http://www.hitecrcd.com/products/ser...i/hs-82mg.html
for rudder and elevator and any small 9gm servo for the spoilers.
Be sure and look up all the build logs on the bbxl and OLY III cuz they are very similar in the building.

The BBXL is not a beginner's kit, however it is not a hard build either.
get a roll of blue masking tape and label EVERY piece in the kit. tripple check! then follw the directions CAREFULLY. The result is a wonderful glider. It requires more than a standard high start. I use a hose monster 3m rig or winch. It is a great model to electrify as well. ENJOY
Old 12-14-2012, 02:29 AM
  #9  
Yank II
Thread Starter
 
Join Date: Jan 2007
Location: Salome, AZ
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Glider Servos

OzMo
I had planed to build it Electric. I would have no help with a high start or really anything else. I didn't mention it before, in case it would offend the purist. Thank you for all the info.
Jim
Old 12-15-2012, 08:54 PM
  #10  
OzMo
Senior Member
My Feedback: (3)
 
OzMo's Avatar
 
Join Date: Sep 2002
Location: OZark, MO
Posts: 2,694
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Glider Servos

Nuttin wrong with electric, it has increased the glider flyer population quite a bit.
Old 01-04-2013, 06:23 AM
  #11  
aeajr
My Feedback: (2)
 
aeajr's Avatar
 
Join Date: Jan 2003
Location: Long Island, NY
Posts: 8,573
Likes: 0
Received 11 Likes on 11 Posts
Default RE: Glider Servos

The Skybird is not a glider you fly fast so your torque needs will be very small. Hitec HS-85s will have way more torque than you would need. I would put HS-85s in the fuse and 85s orin the wings. I only feel the need formetal gears on flaps. So I would use nylon gears for your implementation.

I have gone digital on most of my gliders. Hitec has the 5085s which are metal gears. That is what Ihave for my Bird of Time.
Old 01-22-2013, 09:06 PM
  #12  
Yank II
Thread Starter
 
Join Date: Jan 2007
Location: Salome, AZ
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Glider Servos

Thank you for all the advise. I will probably go with the Hitec HS-82MG's, unless I need the 125's for the wing.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.