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Jan 12, 2013, 08:20 PM
Registered User
Avaldes's Avatar
Discussion

LDS vs. RDS


So now that the FS3/FS4 with LDS has been out for a while, how are they holding up? Are people still happy with them or is anyone wishing they had bought RDS instead?

-Aaron
Last edited by Avaldes; Jan 13, 2013 at 01:24 AM.
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Jan 12, 2013, 09:47 PM
WINS - Winch In Nose Sailplane
jaizon's Avatar
What is LDS?
Jan 12, 2013, 09:58 PM
Challenge is rewarding
djklein21's Avatar
I ordered my latest 2 FS4s with LDS, although I think that there is room for improvement in the current LDS system.
Jan 12, 2013, 10:17 PM
Registered User
Brandon's Avatar
Both FS4's I flew at the worlds are equipped with LDS. As Dave stated I also believe there is room for improvement. I can say that the LDS system has zero slop. You must be sure there is no binding as this can cause problems. With the LDS system on the FS4's there is no way to change out a servo quickly (at the field). The retaining pin, must be removed and the pressure fit can be a bit tricky as well. I still prefer the LDS system to that of the past RDS system.

Brandon
Jan 12, 2013, 11:22 PM
registered weapon
IHAVAWDY's Avatar
Quote:
Originally Posted by jaizon
What is LDS?

Latter-day Saints?

linear drive systems

drug for dyslexic's LSD
Jan 13, 2013, 06:43 AM
F3B
satinet's Avatar
RDS?

I dunno, but LDS can't be worse than some of the RDS systems I have seen.
My own FS3 was crap and my mate's Extasy is worse than that.

The baudis models I have seen seem okay with RDS.

A good RDS is okay, a bad one stinks.
Jan 13, 2013, 04:51 PM
Detail Freak
target's Avatar
Aaron-
I know of one pilot that told me he wished they all had conventional linkages, like the low profile Ceres linkages....
As you are aware, there are pro's and con's to both, but it seems to me that if you have sloppy RDS, that is harder to remedy than a sloppy conventional linkage.
RDS needs to have some give for abundant bind free flap travel, IMO. Telescoping is good.

R,
Target
Jan 13, 2013, 07:41 PM
4 wheels move a body; 2 a soul
Looking at the Baudis RDS stuff I have the servo doesnt move or telescope, at least it appears it wont.....yet they seem to work. Beats me.
Jan 13, 2013, 08:43 PM
Detail Freak
target's Avatar
Yes, the Baudis RDS is perfectly executed for a stiff system....
But in order to get flap travel that is normally used for TD planes, you technically need the wiper to telescope a bit to keep the bend centered over the bisected angle of the surface deflection (don't ask me to explain that one!)....
Its similar to putting centered torque rod linkages into an aileron, and then bottom hinging it; the hinge plane and the torque rod plane are no longer lined up. It will bind unless the torque rod is able to slide in and out of the aileron....

R,
Target
Jan 13, 2013, 09:20 PM
Team JR Air
tewatson's Avatar
Quote:
Originally Posted by target
But in order to get flap travel that is normally used for TD planes, you technically need the wiper to telescope a bit to keep the bend centered over the bisected angle of the surface deflection
Or, the mfrs can start molding flaps as separate parts and knuckle-hinge them...

Tom
Jan 13, 2013, 11:31 PM
Detail Freak
target's Avatar
That's totally true, but then you still would have problems with surface wipers and lots of down flap....
That just proves that nearly everything is a compromise.

R,
Target
Last edited by target; Jan 14, 2013 at 02:02 PM.
Jan 14, 2013, 11:34 AM
Martin

RDS v LDS


I have seen a number of RDS systems and have been surprised at how they can be improperly installed by the best of builders.
I have a RDS FS3 & 4. The FS3 RDS on the flaps is OK but not great. I thought the FS4 RDS would be better but in fact the flap RDS system was installed totally wrong and flap travel is terrible, less than 45 degrees. I was able to get it to just over 50 degrees but I had to move the coupler and servo forward towards the spar almost 3/8".
I friend has just bought the new Crossfire II with RDS and the flap travel is huge, almost 80 degrees as installed.
Bottom line is anything is only as good as how it is put togehter and some of the best builders can make mistakes.
Mart
Jan 14, 2013, 02:02 PM
Detail Freak
target's Avatar
Glad I never put an FS 3 or 4 together.....

R,
Target
Jan 14, 2013, 03:41 PM
F3B
satinet's Avatar
Quote:
Originally Posted by target
Glad I never put an FS 3 or 4 together.....

R,
Target
the freestyler 3 or 4 RDS is about the easiest model to build there is. The wing install consists of screwing the servos in to the RDS couplers. You can do it in a few minutes no problem.

the trouble is it is "what it is". You can't do a lot to make it better, if it's not good.
Jan 14, 2013, 06:36 PM
Detail Freak
target's Avatar
I just wanted to make sure that Martin know that the one he saw built wrong wasn't built wrong by me (this time!).

R,
Target


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