Cyclicscooby Posted July 25, 2012 Share Posted July 25, 2012 Hi Guys.. Quick question... I appreciate ALL aileron control horns are mounted on the lower side.. I assume this is because the drag on the lower side is less important than the topside..?? Reason I ask is, due to construction techniques, it'd be easier for me to do it this way round.. If you were using a pull pull wire setup, you'd have a top horn, just like many real light aircraft.. ?? Excuse my crude pictures.. Normal.. And inverted.. The wing is a 6mm depron sheet, with ribs on top, sheeted in 3mm, and i'd be mounting the horn to the topside of this lower 'base' sheet.. Thoughts or advice... ?!?! Luv Chrisie.. xx Quote Link to comment Share on other sites More sharing options...
Cyclicscooby Posted July 25, 2012 Author Share Posted July 25, 2012 No one.. Luv Chrisie.. xx Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted July 25, 2012 Share Posted July 25, 2012 I think it'll be alright. I've never worked in Depron before, so I don't know anything about it. As long as all the geometry is correct then it will be fine. Real WW1 planes like the Sopwith Pup has control horns on the top side of the elevators. CS Quote Link to comment Share on other sites More sharing options...
Cyclicscooby Posted July 25, 2012 Author Share Posted July 25, 2012 Did they... ?? Cool.. That justifies me going ahead with it then... Cheers CS.. Luv Chrise.. xx Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted July 25, 2012 Share Posted July 25, 2012 I think the reason the aileron linkage is on the underside is purely for appearance. You shouldn't have an aerodynamic problem unless you are looking for record breaking speed, and then you would want internal linkages in any case. Quote Link to comment Share on other sites More sharing options...
Concorde Speedbird Posted July 25, 2012 Share Posted July 25, 2012 On the Pup I saw at the Fleet air arm museum, it did. It may have had horns on top and bottom. The whole plane is basically a big RC plane with space for a pilot! The construction is all the same! CS Quote Link to comment Share on other sites More sharing options...
Richard Wood Posted July 25, 2012 Share Posted July 25, 2012 Chrisie Many low wingers have a top horn on a torque rod assembly just like this, but it's all enclosed in the fuse of course. The only thing that looks slightly odd is the change in differential caused by the steep angle of the pushrods.... Quote Link to comment Share on other sites More sharing options...
Ian Jones Posted July 25, 2012 Share Posted July 25, 2012 Common practice on flying wings that belly land - would take out the aileron controls on every landing otherwise. There's an example here Quote Link to comment Share on other sites More sharing options...
Aky208 Posted July 25, 2012 Share Posted July 25, 2012 If you don't care about the cosmetics then topsided i feel is much more of an advantage. especially for the elevator. i'd much rather having the rod pulling the elevator up then pushing and possibly bending. Quote Link to comment Share on other sites More sharing options...
Mart49 Posted July 25, 2012 Share Posted July 25, 2012 On my park flyer, the first mod I did was to have the horn on the elavator on the top side, just as Aky metions above - rather pull the elevator up. I prefer my plane to go up easier than down Quote Link to comment Share on other sites More sharing options...
Steve Houghton 1 Posted July 25, 2012 Share Posted July 25, 2012 As Ian Jones said, on flying wings it is common practice to have top mounted aileron horns. I also have a Phoenix Synergy glider which also has top mounted horns and works just as effectively as underside mounted. You can just see the control linkage in this picture. Quote Link to comment Share on other sites More sharing options...
Cyclicscooby Posted July 25, 2012 Author Share Posted July 25, 2012 Thanks for all the replies guys... Very helpful.. Basically, i've got the wing, ribs, ail + flaps done, and need to setup aileron control.. Due to the 6mm base, and 9g servo's, i'd have to cut the flat servo, flush into the base to get the arm to reach.. A neater option, is to mount the bought plastic horn to the top side of the base, poking out thru the top skin, when it's on.. The control rod will require a slot to be cut in the top sheet for the up-down movement, but this is easier than cutting a servo-sized hole in the base.. Cheers everyone.. Luv Chrisie.. xx Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted July 25, 2012 Share Posted July 25, 2012 Chrisie Just one further point. The 'best' position for the horn can depend on the aileron hinge line. Obviously if the aileron is bottom hinged (or even lower in a 'Frise' set up) then a top horn will be shorter and might almost be submerged. With differential ailerons a top hinge can be a bit better aerodynamically so a bottom horn is preferred. By the way the Pup only had aileron horns on one side (above on the top wing, below on the bottom) as the cable went between them. This is my true scale 24" Pup. (Its upside down!) A single 'closed loop' cable run from just one servo in the fuselage (or the joy stick in full size) joins all four ailerons. p.s. Memo to self - Stop being such a scale nerd! Quote Link to comment Share on other sites More sharing options...
Turbycat Posted July 25, 2012 Share Posted July 25, 2012 I put them on the top side of the lower wing on my Mini Panic. That goes fine. Plus I've probably saved the servos from being mashed every time I knock the u/c off Andy Quote Link to comment Share on other sites More sharing options...
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