home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!think.com!rpi!usc!lewis
- From: lewis@pax.usc.edu (tony lewis)
- Newsgroups: rec.models.rc
- Subject: Re: neat helicopter modification
- Date: 8 Nov 1992 15:31:06 -0800
- Organization: University of Southern California, Los Angeles, CA
- Lines: 27
- Distribution: world
- Message-ID: <1dk7vqINNrjl@pax.usc.edu>
- References: <42211@gremlin.nrtc.northrop.com>
- NNTP-Posting-Host: pax.usc.edu
-
-
- > He had rigged up a way to attach a servo to his vertical tail fin!
- >Tail-pitch control was done using that servo. That allowed him to
- >get rid of the long wire running back along the tail boom that normally
- >controls tail rotor pitch.
-
- I was involved in a project to put a helicopter under computer control.
- I was experiencing alot of trouble with the tail rotor pitch control.
- It was due to the hysterisis caused by Kyosho's silly long pushrod design.
- I hit upon the same solution; placing a servo on the tail fin, only i
- used the horizontal tail fin. THis will reduce the moment caused
- by have a servo so far away from the CG (as in a vertical tail fin mounting)
- What I did was to cut out a piece of plywood about 6" long and 2.125" wide.
- I mounted the servo in the plywood and the plywood under the horizontal
- tail fin using the existing mounting screws. I then used a short pushrod.
-
- The response was much much crisper, and I could easily place the helicopters
- YAW under computer control. I think Kyosho should make this a permanant
- modification.
-
- Disclaimer: This is something that I am doing in a research environment.
- If you choose to make this modification, and something happens to the craft
- as a result, I won't be held responsible.:-)
-
- Tony Lewis
- USC Robotics Lab
- lewis@mensa.usc.edu
-