Martin Harris - Moderator Posted September 8 Share Posted September 8 I had the experience of test flying a nicely finished Nijhuis Lysander of unknown build provenance on Saturday. After a few moments of doubt over clearing the hedge, it became apparent that it was in dire need of an armful of up elevator to achieve a positive climb - even after adding all of the available trim. With the stick held an inch or so rear of centre, the model settled down to flying quite nicely - although stall testing was not really practical with limited elevator available. The landing was uneventful - if rather fast for a model of an aircraft designed for clandestine landings in foreign pasture fields and the trimmed position of the elevator was significantly up, so the obvious suspicion is a forward C of G. My rule of thumb estimate certainly agreed with this conclusion although the complex wing planform makes this rather tricky to have confidence in. I've had a look through the build notes found on the 4Max site but it simply states that the C of G on the plan (which the owner doesn't have) should be correct...although deliberately forward. As we don't have a plan or other reference to rigging angles, it's not easy to assess the build accuracy so, in order to cut a few corners, does anyone have experience of this model and/or access to the plan to help confirm my diagnosis? A figure for the C of G position relative to the leading edge at the fuselage junction would be a good starting point. Quote Link to comment Share on other sites More sharing options...
Christopher Long 1 Posted September 9 Share Posted September 9 You could just ask Tony? His email address is [email protected] Quote Link to comment Share on other sites More sharing options...
RottenRow Posted September 9 Share Posted September 9 The TN Lysander plan was originally included as the free plan with the RCM&E 2009 Autumn special edition. Perhaps someone will have a copy with the plan and build article? There is also a long build thread on this forum, under Tony Nijhuis Plan Builders. Brian. Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted September 9 Author Share Posted September 9 Thanks RR - I did do some searching within that thread but didn’t find anything useful. (Not to say I mightn’t have missed something but searches on key words didn’t flag anything useful). 1 Quote Link to comment Share on other sites More sharing options...
Caveman Posted September 9 Share Posted September 9 Indeed, someone has a copy of the plan and article! A scan of the plan showing the CoG position TN Lysander Plan.pdf An extract from the article, see bottom of column 2 for info. TN Lysander Article extract.pdf Hope that helps. GDB 1 Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted September 9 Author Share Posted September 9 Thank you so much - that’s just the information needed. Quote Link to comment Share on other sites More sharing options...
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