Craig Spence Posted February 25, 2011 Share Posted February 25, 2011 Hi all,I will be fitting retract servo's tonight in nacelles, I was wondering if anyone could give some sound installation advice.The retracts operate through an angle of 45% and are folding with an opening an locking mechanism. I find it hard to explain, there is a leg either side of the wheel and braces from either side of the wheel through an angle of 45% approximately.When the servo operates it collapses these braces and folds them locking the wheel in.My questions are:1. Should the servo ( or servo arm) be installed central to the retract operating arm. Ie... A line through the centre of the retract to the point of contact with servo.2. The servos I have operate through the angle of 180% however the retracts work through the angle of 45%, how does this work?, is the extra 45% to ensure the locking mechanism is fully locked?. I have been assured that these are the right angles to work with.3. Would it be ideal if the servo was mounted at 45% to the the opening/ locking mechanism.4. What's the best linkage system to use, I have been advised to use a ball link system for best performance. Could I use carbon rods opposed to metal?, or does it really matter.Any advise really, also how do you avoid getting the retracts locked into closed and the current draining your battery.Cheers all. Quote Link to comment Share on other sites More sharing options...
Craig Spence Posted February 25, 2011 Author Share Posted February 25, 2011 Correction all, sorry my retract servo's operate through the angle of 90%. So any help please?.Cheers all. Quote Link to comment Share on other sites More sharing options...
Stephen Grigg Posted February 25, 2011 Share Posted February 25, 2011 Ill be watching with interest craig ,I struggle with retracts Quote Link to comment Share on other sites More sharing options...
Craig Spence Posted February 25, 2011 Author Share Posted February 25, 2011 I hope we can get some quality advice as I need to fit mine as efficiently as possible, my patch is quite bumpy and I really could do without pulling nacelles apart to fix retracts and undercarriages.Let's see if anyone can help. Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted February 25, 2011 Share Posted February 25, 2011 whats the model? any pictures of the mechanism in its various travels? and its advisable to fit a retract servo only battery pack, if the retracts jam, they will drain the flight battery quicker than you can say IVE LOST IT, Edited By Alan C on 25/02/2011 18:38:58Edited By Tim Mackey - Administrator on 25/02/2011 18:53:53 Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted February 25, 2011 Share Posted February 25, 2011 this may be simpler to understand, apologies for the other forum link, but if it helps a memberEdited By Alan C on 25/02/2011 18:45:54Edited By Tim Mackey - Administrator on 25/02/2011 18:54:19 Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 25, 2011 Share Posted February 25, 2011 Why dont people read latest posts ? Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted February 25, 2011 Share Posted February 25, 2011 tried, failed, not all are good at this ya know, will try againEdited By Alan C on 25/02/2011 19:06:37 Quote Link to comment Share on other sites More sharing options...
Craig Spence Posted February 25, 2011 Author Share Posted February 25, 2011 Hi Alan,Thanks very much for the help there, I have seen the separate battery for retracts before however how do you do it for two retract servos that have to go into one receiver port?Will this just mean more y-leads?.The model its going in is a Brian Taylor dh mosquito 71". As for pictures of other peoples ones there are some but for air retracts and they are also custom made from unitracts ( they no longer make them, doh! ). The ones I will be fitting are as the plan states made with piano wire, keep it light as possible.Thanks for the diagram Alan.Any other takers for the questions?.Cheers. Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted February 25, 2011 Share Posted February 25, 2011 Gibbs Guides Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted February 25, 2011 Share Posted February 25, 2011 COR, it works, sorry tim old boy, promise i will use this rather nifty thing from now on, only trying to help the guy you know, Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 25, 2011 Share Posted February 25, 2011 Posted by Craig Spence on 25/02/2011 19:07:01:Hi Alan,Thanks very much for the help there, I have seen the separate battery for retracts before however how do you do it for two retract servos that have to go into one receiver port?Will this just mean more y-leads?.The model its going in is a Brian Taylor dh mosquito 71". As for pictures of other peoples ones there are some but for air retracts and they are also custom made from unitracts ( they no longer make them, doh! ). The ones I will be fitting are as the plan states made with piano wire, keep it light as possible.Thanks for the diagram Alan.Any other takers for the questions?.Cheers. Yes , just Y lead the two retract servos together and then wire up the single branch of the Y lead as if it were a servo - to the separate battery as shown. Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted February 25, 2011 Share Posted February 25, 2011 I would fit 2 into a Y lead, should work, or hard wire them together, to avoid contacts not--errm, contacting as for the retract geometry, i would bolt the whole thing to a lump of ply, and figure it out, all servos, far as i know, are the same, what does BT say? Quote Link to comment Share on other sites More sharing options...
andy watson Posted February 25, 2011 Share Posted February 25, 2011 I have just bought some heavy duty RC lander all metal servoless retracts to try make this as painless as possible. Time will tell how I get on. Quote Link to comment Share on other sites More sharing options...
Craig Spence Posted February 25, 2011 Author Share Posted February 25, 2011 Tim thanks for the clarification there.Hi Alan,Thanks again, much appreciated. Well BT operates both retracts by use of bell cranks going to one servo, I wasn't keen on this so I opted for independent servo's. Quote Link to comment Share on other sites More sharing options...
Craig Spence Posted February 25, 2011 Author Share Posted February 25, 2011 Hi Andy,How does hat work then?, servo less. I take it there the electric ones which operate on a motor screw?.Let us know how you get on with them.Cheers, Craig. Quote Link to comment Share on other sites More sharing options...
andy watson Posted February 25, 2011 Share Posted February 25, 2011 I thin that's it. I will blog them in detail in the Vulcan build thread. Quote Link to comment Share on other sites More sharing options...
Craig Spence Posted February 25, 2011 Author Share Posted February 25, 2011 I'll be watching, sounds a good project. Quote Link to comment Share on other sites More sharing options...
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