rcaddict Posted July 8, 2016 Share Posted July 8, 2016 just hot glued front end of my wot 4e back on again!! - looks like a lot of downthrust has developed !!!! will this make any differance Quote Link to comment Share on other sites More sharing options...
The Wright Stuff Posted July 8, 2016 Share Posted July 8, 2016 Hi, first of all, are you sure? I know that probably sounds like an incredibly stupid question, but these types of models tend to have a lot of downthrust built in as supplied, but unless you inspect it closely, it's not that noticeable. Obviously after the repair, you tend to notice it much more. I have this issue with my PZ T-28. I was convinced it was wonky after a hard 'arrival' but on inspection, there was loads of downthrust there all along. Assuming that's NOT the case, and that you have added downthrust, it depends what you mean by 'a lot'. More than a degree or so compared to before and yes, it'll certainly be noticeable - and probably very uncomfortable. A model sticking it's nose down when opening up to go around again on approach would certainly test your nerve. If you have concerns, it's definitely worth spending a couple of evenings to see if you can put it right... TWS Quote Link to comment Share on other sites More sharing options...
rcaddict Posted July 8, 2016 Author Share Posted July 8, 2016 I know there was side thrust built into the mount but never noticed any downthrust. if I knew exactly how much down there should be I could do a bit of re-modeling at the front end !!!! or maybe I should just re-model at neutral Edited By oldgit on 08/07/2016 13:29:09 Quote Link to comment Share on other sites More sharing options...
The Wright Stuff Posted July 8, 2016 Share Posted July 8, 2016 I'm afraid I don't have a WOT4, but I'm sure there must be plenty of people on here who do! Quote Link to comment Share on other sites More sharing options...
Mike T Posted July 12, 2016 Share Posted July 12, 2016 The embedded part of the mount should be vertical within the fus when it is held up level (i.e. when the rear fus. behind the wing is horizontal) The motor carrier that screws to the plate has a few degrees of down bent in a part of the folding process - no more than about 5 degrees, I think. If your internal plate is not vertical, then I suspect your fus has got bananaitis and needs to be 'eased' back in line... HTH Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted July 12, 2016 Share Posted July 12, 2016 Submersion into Very hot water Old, does uncrimp crushed foam somewhat But is best done before glueing Heating crash damage in any form does help plastic memory return some of the original shape Quote Link to comment Share on other sites More sharing options...
Andrew767 Posted July 12, 2016 Share Posted July 12, 2016 Denis's idea is very good but sometimes it's not practical to submerge a component. If this is the case, a wet tea towel covering the wrinkled bit and running your modelling iron over it can have the same effect.I also had a down thrust issue and corrected it by gluing a ply shim between the rear of the motor mount and the foam. Andrew Quote Link to comment Share on other sites More sharing options...
rcaddict Posted July 12, 2016 Author Share Posted July 12, 2016 hi guys = ok so I have 10 deg downthrust and I had a test flight this morning , I had to put in abou 5mm up elevator to keep it level a cruising speed - so I presume I have to pack out the downthrust to get about 5 deg - does this sound about right Quote Link to comment Share on other sites More sharing options...
Andrew767 Posted July 12, 2016 Share Posted July 12, 2016 Would be a good place to start. Andrew Quote Link to comment Share on other sites More sharing options...
ernie carter Posted October 12, 2016 Share Posted October 12, 2016 just found in my shed a piece of black foam that is very light. I know this foam is used for lining tool kits in the RAF. Is this closed cell foam and has any one ever used it for modelling. the piece I have found is about 1ft sqare 12mm thick and weighs only a few grams by the feel of it Quote Link to comment Share on other sites More sharing options...
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