crispin church Posted March 15, 2013 Share Posted March 15, 2013 on this twin got springy wheel arms that are rubbish on thick grass noses over easy someone said keep the tail down will help ? or i change for fixed metal like on a cap but this would be a lot of work in the wing any ideas please Edited By Biggles' Elder Brother - Moderator on 15/03/2013 21:14:05 Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted March 15, 2013 Share Posted March 15, 2013 Re the "keep the tail down" coomment. Are you taxying with full up elevator? The problem might be that with it being a twin there isn't much prop wash over the elevator. One thing you can try is to have a crazy big throw elevator in for taxying and take off that you switch out just after lift off. Holding this full up keeps the tail down. But obviously you need to ease out of it as the model builds speed towards take up or you become airborne in a rather dramatic way! I used to have this set up on a Chipmunk and it was the only way I could stop it from tipping up! BEB Quote Link to comment Share on other sites More sharing options...
GrahamC Posted March 15, 2013 Share Posted March 15, 2013 You could try bigger wheels if they don't ruin the look. Is it possible to rake the arms forwards a little more? Quote Link to comment Share on other sites More sharing options...
cymaz Posted March 16, 2013 Share Posted March 16, 2013 about just over halrf thewheel should be beyond the wing leading edge to stop the plane nosing over............ Quote Link to comment Share on other sites More sharing options...
Panther Posted March 21, 2013 Share Posted March 21, 2013 All you need to do is bend the wires further forward then it won't nose over. Maybe an inch or so. Quote Link to comment Share on other sites More sharing options...
crispin church Posted April 9, 2013 Author Share Posted April 9, 2013 this is what i done but now thinking is the wheels still too far back have not been able to fly yet but lifting tail up does go alot higher before tipping over ie nose over 6mm plastic bolts holding it on Quote Link to comment Share on other sites More sharing options...
Panther Posted April 9, 2013 Share Posted April 9, 2013 Sounds like you are nearly there. With the 2 motors you have a lot of weight out front. Try it but I would be inclined to go nearly to the front of the ply plates you have them mounted on. Second thoughts, to save a lot of work, fit a small wedge shaped piece of ply under the dural to tip the wheels forward, thin bit to the front of course. Good luck Edited By Panther on 09/04/2013 14:07:08 Quote Link to comment Share on other sites More sharing options...
crispin church Posted April 9, 2013 Author Share Posted April 9, 2013 hopefully flying tomorrow i was looking at it today and was going to rip it all off and mount the plates under the exhaust but then said sod it try it first as it is a lot better than before ie holding the tail up higher before engines would tip it over panther like your idea tip wheel forward many thanks Quote Link to comment Share on other sites More sharing options...
crispin church Posted April 9, 2013 Author Share Posted April 9, 2013 Panther thank you for idea sanded wedge off block given wheels inline front edge of wing another 50mm without moving anything Quote Link to comment Share on other sites More sharing options...
Panther Posted April 9, 2013 Share Posted April 9, 2013 Ahhh looks good. Cheers, now go fly.... Quote Link to comment Share on other sites More sharing options...
crispin church Posted April 11, 2013 Author Share Posted April 11, 2013 didnt get to try bolt fell out the carb at the airfield Quote Link to comment Share on other sites More sharing options...
TinPot Pilot Posted April 11, 2013 Share Posted April 11, 2013 I assume the wheels are really free running. I know an experienced flyer whose had similar problems for weeks which was eventually sorted out at the field when another flyer put a couple of drops of oil on the axels. The wheels didn't feel tight in the least before being oiled. Quote Link to comment Share on other sites More sharing options...
crispin church Posted April 11, 2013 Author Share Posted April 11, 2013 the first lot ran fine had oil on them i oiled all axels for the winter the legs would spring back with the lightest of touch and nose plane over our grass had been cut for first time this year and the mower left a lot of grass cutting and the wheels when just not go over it and just spring under Quote Link to comment Share on other sites More sharing options...
Roger 2 Posted April 11, 2013 Share Posted April 11, 2013 Hi Crispin I have one suggestion, vertical C of G. If the weight is high up then there is a large rotational moment to the wheels, so drag on the wheels causes a nose over. Just a suggestion. Cheers Roger Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted April 11, 2013 Share Posted April 11, 2013 Makes you wonder just why non-scale freeflight models many years ago had big wheels just abaft (nautical term?) the prop.CG was way back and they didn't normally tip over .Anyone else remember them ?? Quote Link to comment Share on other sites More sharing options...
crispin church Posted April 12, 2013 Author Share Posted April 12, 2013 i agree Roger 2 on that the problem i was getting with the old wheels was the legs had a spring / coil near the bottom that easy bent over on the smallest of hump on the ground the airfield i fly at had its first grass cut of the year and the mower left a lot of cut grass behind and each time it got to a bit it one leg would bend under and plane nose over mite of been the spring leg is very old and weak ? any way gone now its a great plane to fly and sounds great as its two different make of engines and two sounds Quote Link to comment Share on other sites More sharing options...
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