I recently setup top driven flaps and noticed two things: A little trickier to setup, especailly if there is a secondary TE spar and the servos are mounted to the servo cover (are they all this way?).
The benefit of the top driven is the linkage is pushing on the fat part of the horn, instead of pulling on the small end of the horn, which may reduce the stress on the horn when you drag the flaps across the rocks on landing ;-) [called "desert skegs" here in Arizona]. But this benefit is minimal if you have good horns. I would go with bottom driven if I had to choose. I really would go with RDS if I had better building skills and the parts/plane to do it. On 6/22/05, Jo Grini <[EMAIL PROTECTED]> wrote: > Ok I see there were plenty replies after I wrote this but anyhow... > > The name is Martin Hepperle.... he has a nice article about drag and linkage > http://www.mh-aerotools.de/ > Direct link http://www.mh-aerotools.de/airfoils/linkage.htm > It might seem small but with the small differences in todays models the drag > is very important. > Might not be that important to a slow TD model. But for F3B/F on top > level.... > > The linkage on the Superior/Brio is not super. There are solutions that are > much better but most of them with more drag. But it is hidden and gives and > drag advantage when flying fast (and also zoom). It is offcourse up to each > customer to build a better linkage. Personally I change out the flap horns > to more secure ones in 2mm carbon (because I land VERY hard). It comes down > to that Samba wants a ready solution that works and with small drag. > Customer just screws the horn in the correct angle and all is set to go (or > atleast the customer will ahcive the 90 degree flap etc. without reinventing > the wheel). > > Hilsen (Regards) Jojo > www.grini.no > > > > > > Date: Tue, 21 Jun 2005 18:24:15 -0700 > > From: "D Hauch" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Subject: top or bottom driven ? > > Message-ID: <[EMAIL PROTECTED]> > > > > hi all, > > I've been asked this a few times, and I give my opinion, > > but i want to see what you guys have to say. > > > > What gets better mechanical advantage, top or bottom > > driven linkage, and how much does the drag of bottom driven > > really effect things, if any ? > > > > My vote goes towards bottom driven. > > I can always get the throws I want, easy to set up and adjust, > > and gives a solid control surface. > > > > Dave Hauch > > www.git-r-built.com > > > > ------------------------------ > > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and > "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and > unsubscribe messages must be sent in text only format with MIME turned off. > Email sent from web based email such as Hotmail and AOL are generally NOT in > text format > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
