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Old Sep 27, 2014, 10:07 PM
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United States, CA, Los Altos
Joined Feb 2012
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RDS for Hmodel Arcus?

I just picked up a new 6.6m Hmodel Arcus. I'd like to set up all flap and aileron surfaces with internal linkages, but this will be my first time doing so. It's important that the finished system be super tight for no flutter.

Can anyone who has set up LDS and/or RDS on the Arcus give any recommendations on hardware choices, and feedback on how well it has worked out on the Arcus? For example, which RDS system seems to work well with the built in aileron pocket (can anyone confirm that it is 2.2mm?), and do I need a sliding servo frame? What has worked for the tiplet? And on LDS, for example, should I use a support bearing, and what material works well for the embedded horn in the flap?

Here are some potential choices, though I know there are others!

Thanks,
Rick

http://aviogate.com/index.php?option...id=210&lang=en (RDS)

http://aviogate.com/index.php?option...id=209&lang=en (LDS, aka "RDH")

http://www.oberflugmodellbau.de/inde...n/produkte/rds (RDS)

http://www.tud-modelltechnik.de/en/zubehoer/ (this LDS system might work for ailerons and tiplets)
Further discussion here http://www.rcgroups.com/forums/showt...1420525&page=7 (skip to post 100)

http://flightcomp.com/product-catego...aring-support/ (misc servo frames and third bearing support; also see http://www.soaringusa.com/External-B....0mm--4pk.html)

http://www.rcgroups.com/forums/showt...1571311&page=3 (IDS system from servorahmen.de -- skip to post 39)

Here is the servorahmen.de website (translated) -- for pictures, see the above thread on rcgroups!
https://translate.google.com/transla...112&edit-text=

Soaringusa has the Baudis RDS units, which may be necessary for the tiplets because the aileron is only 6mm thick at its leading edge (not enough moment arm for LDS?)
http://www.soaringusa.com/RDS-System...-Full-Set.html

Install tips on Baudis RDS:
http://www.rcgroups.com/forums/showt...318603&page=26
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Last edited by rjtw; Oct 04, 2014 at 01:14 PM.
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Old Oct 02, 2014, 12:08 AM
Registered User
United States, CA, Los Altos
Joined Feb 2012
181 Posts
For what it's worth, the Servorahmen IDS is my top choice - small, appears to be high quality and super tight, and everything you need including bearing support, frame, control rod, and embedded control horn. Oh, and the control rod can be cut to whatever length needed... some of the other systems only have a preset unadjustable length. Soaringusa (no association) stated in one of the above threads that they will start carrying them soon.

(Edit) I may not be able to use LDS on the tiplets, the wing is getting quite thin (barely enough to squeeze in an 11mm servo) and the thickest part of the aileron is only about 6mm. That makes a very small effective control horn. I may try ordering the Baudis RDS system if it will fit the servos I want to use and somehow shoehorn in the RDS pockets in those tiplet ailerons.
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Last edited by rjtw; Oct 04, 2014 at 01:59 AM.
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