randsmit Registered Member
Posts: 2
(5/16/03 7:44 am) Reply
Pushrod Recommendations
OK, boyz..... Here's another question.
As I prepare to assemble my Micron yet to be delivered, I'm gathering up all the necessary building materials. What is the best material and method for elevator pushrod ? I have seen some music wire, I have seen some very slim CF pushrods / combo of both.
Also, what do you use for control horns. Make your own from thin ply or is there a nifty off-the-shelf solution?
This light-duty electron stuff is new to me. Bring on a BARKING Q40 !!!! Gas and Go !
Randy
f1ca Registered Member
Posts: 2
(5/16/03 10:03 pm) Reply
push rods
I use a small carbon fiber pushrod with small wire ca'd into the ends. The wire is the right size for my servo arm and also for off the shelf Dubro micro control horns. I use a Dubro micro snap keeper for the wire at the control horn end which has only a 90 degree bend in it. This is plenty strong enough for the speed of my Simple 400, but I think if I had Roy's twister or any brushless powered aircraft I would fashion something out of circuit board material for the horn. I saw on line somewhere some laser cut horns made from circuit boards but I don't have the link.
Murray
SoarNeck Registered Member
Posts: 2
(5/16/03 10:19 pm) Reply
Re: push rods
I use a straight, unsupported run of 0.070 carbon rod...but my pushrods tend to be short. If you buy one 48" pushrod from ACP or CST (both carried at PM on occasion), it should be enough for several S400 racers. The ones from ACP come with plastic sheathes; the ones from CST in teflon.
Make up a couple of short (1-2") runs of light wire, and put TIGHT z-bends in the ends (no z-bend pliers, please). Use some shrink tube to attach the wire to the rod, and put a light drop of THIN C/A in one end. Adjust the other end by sliding the rod/wire in the tube of shrink wrap, and glue in place when satisfied. 100mph+ Stinger (on the B20) says that it can be done quite safely (20 or so flights so far).
If you want clevises, make a 90 degree bend in the wire and lash a separate piece of wire parallel to the shank. That's what they used to do before Dubro was invented
I've used the laser cut plywood horns from PM, but I usually make mine up out of cured carbon fibre scraps (I have a LOT of this left over from old heavy-lift model skins). For those that bag their own, it usually equates to 3-4 layers of 4.7 oz carbon.
randsmit Registered Member
Posts: 3
(5/17/03 11:55 am) Reply
Re: push rods
thanks for the tips guys, anyone with more thoughts, just jump right in.
Pushrod Recommendations
push rods
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