johnc1go
Posts: 123
Joined: 12/11/2002
From: South Bend,
IN, USA
Status: offline
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I had a control issue similiar to the one andrew speaks of with his shrike. Upon pulling out of a full power dive, the airplane would pitch up violently, dropping the right wing 90 degrees. I found that diving more shallow and reducing speed solved the problem, but I still needed to address it. I'm thinking a high speed tip stall on the right wing. I carefully inspected both wings for warps, no warping to be found. I still felt I had to do something, so I ironed in a sligh amount of washout into the right wing tip. The next, back at the flying field, same thing problem. Well, I just gave up and learned how to deal with it. Recently, I upgraded from 72 mhz to spread spectrum.
Any of us who build shrikes understand the problem routing the reciever antenna. When I was on 72, I ran my wire out the needle valve side of the fusealage, above the wing and through a little hole I drilled in the bottom of the left tail fin. This would allow for about 1 foot of wire to trail out behind the plane. Upon switching to spread spectrum, the antenna issue was eliminated as I could keep the much shorter antannae inside the airplane. Walla.....my "tip stall" problem was suddenly solved. I was mistaking a radio glitch for a tip stall. Perhaps the glitch was brought on by the exposed antenna wire oscillating in a certain way during high g manuevers, I don't know, I do know that I no longer have the problem and that high altitude split S's are much more fun.
< Message edited by johnc1go -- 10/7/2007 3:08:28 PM >
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Printable Version
All Forums >> RC Airplanes >> Sport Flying >> RE: SHRIKE CLUB # 1 
RE: SHRIKE CLUB # 1 - 
). The Rossi is pretty heavy so it sounds like I will need to move the firewall back 3/4"- 1". (Advise on how much gladly accepted). I have also seen many posts where people have used Spruce spars and doubled up the spars through the fuselage. ( I think both are a good idea for such a small mod.) I like the hatch Idea under the tank area also. I am also thinking that adding thin ply to the belly may be a good idea for rough field / Ice & snow use also. I notice there is much discussion about elevator size and material. I was planning on taking a look at the stock material once my kit arrives and making a decision about that one. Any advice would be much appreciated. 
I personally would not attempt this. As far as MODS read this thread and use what makes sense. On my shrike , I didn't do any modifications at first. After a few flights with the APS .15 on th enose I put a MAG .28 on the nose and what a difference in flight characteristics. The elevator would be a definite MOD for using a bigger engine. just make the width bigger for better response. The last thing I would do if you plane on flying in the snow , is to water proof everything. GL on your SHRIKE. 
