Simon Chaddock Posted April 11, 2012 Author Share Posted April 11, 2012 In a pause of the build of the VSTOL and other repairs I have started on the P1121's ailerons. Quite a reasonable scale size but now comes the tricky bit. First a servo has got to go in what is a very thin wing but more difficult will be the servo wire that has to find its way through the wing, into the fuselage, around the duct and forward to the radio. The mods to the tailpane wont be that much easier either. Being an all stressed skin structure I really need to keep any cutouts to a minimum. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted April 13, 2012 Author Share Posted April 13, 2012 I made a bit of an error cutting out the underside skin for the servo! The wing is indeed thin. With the 3.7g servo as far in as it will go (glued to the top skin) it is still flush with the lower skin. The wing has no ribs so feeding the servo wire to the wing root was not too difficult. But getting it into the fuselage and through 3 formers to the radio will be harder. I posted this video in the "Digital versus Analogue" thread to show that analogue servos are not that bad. Here it is more about how the aileron looks. Aileron centring test from Quorneng on Vimeo. The other side should be a bit easier as at least I will know what I am doing! Edited By Simon Chaddock on 13/04/2012 22:22:45 Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted April 16, 2012 Author Share Posted April 16, 2012 With the ailerons sorted, atleast as far as feeding the servo wires to the radio, the next task is the tailplane. There are two issues. First I was never happy with the rigidity of the tubular spar aroud witch each rotates. it was simply too small a diameter. Second the servos operate as elevons through a small 'mixer' unit. Now with reasonably sized ailerons the tailplane might lust as well revert to an all moving 'elevator' but with each half moved by its own servo. The major surgery required to remove the old spar. The new an old tailplane spars. Extracting the old 'aileron' servo wire and mixer unit will require some more fuselage cut outs to gain access Edited By Simon Chaddock on 16/04/2012 15:11:02 Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted April 17, 2012 Author Share Posted April 17, 2012 Sorting out the new elevator servo wire is proving tiresome. The fuselage now looks like a piece of Emmental cheese! Hopefully when they are patched up it will be a case of "Can you see the join?" Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted April 18, 2012 Author Share Posted April 18, 2012 New wiring installed and tested, holes patched. A bit of lightweight filler and it will be as good as new, well nearly! Edited By Simon Chaddock on 18/04/2012 18:08:28 Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted April 21, 2012 Author Share Posted April 21, 2012 Virtually complete. The 2 extra servos, sanding, filling and repaint has added a bit over 1/2 an oz, now 17.3 oz total. Hawker P1121 control test from Quorneng on Vimeo. A little bit of final finishing still to do then wait for the right weather! Quote Link to comment Share on other sites More sharing options...
Tony Bennett Posted April 21, 2012 Share Posted April 21, 2012 very impressive young man. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted April 26, 2012 Author Share Posted April 26, 2012 I had to think long and hard about this. How to retain an all moving tailplane that rotates about a fixed tube spigot? My first attempt was to cut a hole in the tailplane skin and fix a bush on the end of the spigot. This worked well enough but after the tailplane rebuild the new larger diameter spigot occupied the entire depth of the tailplane leaving no room for a retaining bush. My solution was a spring loaded 'retainer' that allowed the tailplane to simply to 'click' home but could be still removed with a positive pull. The retainer is shim brass with a tiny 1.8mm diam brass 'button' with a hemispherical end soldered to it. The retainer in place inside the 5mm diam tail tube. And it seems to work very well or until the day it comes off in flight! Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 3, 2012 Author Share Posted May 3, 2012 Today was just about calm enough to fly and it did, but not all went well! The first attempt resulted in an immediate left hand roll into the ground which almost broke off the nose just ahead of the wing..Entirely my fault as the ailerons were not quite level and to make matters worse they were assisting the motor torque! I gently pushed the nose back in place. To my amazement it actually flew quite well, rather like the Skyray and ridiculously slowly but as the almost severed nose also carries the battery just the most gentle of flights and a 'flop' landing directly into the gentle breeze. The LH side of the nose. A tensile break that goes from top to bottom. The compression damage on the opposite side. As the LH wing tip hit the ground it pulled the LE out of the fuselage a bit And probably the hardest to repair the TE of the wing pushed in and punctured the duct. Hopefully not to hard to fix. The next flight will be on video! Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 4, 2012 Author Share Posted May 4, 2012 Repairs underway. First the split on the RH side of the nose was glued together to stabilise the structure. When dry this allowed the compression damage to be cut away between the fusleage formers. The planking in the process of being replaced with a jury balsa strut in place to avoid ending up with a 'banana' nose! Edited By Simon Chaddock on 04/05/2012 09:30:37 Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 4, 2012 Author Share Posted May 4, 2012 I just managed to get it complete before the weather closed in. It was nevertheless rather too windy with a heavy overcast and the light was poor, but it flew. Depron Hawker P1121 from Quorneng on Vimeo. No apologies for keeping rather high but the glue had not had time to fully harden so I did not want to risk anylthing. It will look better in sunshine - if & when we eventually get some! Quote Link to comment Share on other sites More sharing options...
Erfolg Posted May 4, 2012 Share Posted May 4, 2012 Seemed to go well Simon! I was out today as well, it was a bit more blowey than I thought it would be. On that basis i guess you are quite satisfied. Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 5, 2012 Author Share Posted May 5, 2012 Its always satisfying to build something from scratch and see it fly. Flew again this morning with the aim of pushing the envelope a bit. The comparison with the similarly powered Skyray is interesting. Being a delta the Ray has of course 'lighting' roll and pitch control and a slightly better thrust to weight ratio but at speed it is very twitchy in pitch in fact it 'feels' like it is loosing stability as the speed builds up. I have not yet plucked up courage to see if it really has a Vne! The Hawker on the other hand 'feels' quite solid at speed and looks like it can go a bit faster too. Slow speed flight is very similar but not a patch on the Ray for aerobatics. As I was concerned at a lack of roll control I 'built in' equal aileron deflection (the Ray has quite a bit of mechanical differential) and not surprisingly with no rudder it displays significant adverse yaw at slow speed. (My humble DX6A tx does not have an aileron differential capability!) Overall it appears each is mimicking its full size characteristics. The Ray was nimble, noted for its aerobatic performance but had distinct flight envelope limitations. The much bigger Hawker was of course never flown but was intended to intercept inter-continental bombers. Quote Link to comment Share on other sites More sharing options...
Pete B Posted May 5, 2012 Share Posted May 5, 2012 Posted by Simon Chaddock on 05/05/2012 12:27:19: (My humble DX6A tx does not have an aileron differential capability!) If you mean a Dx6i, Simon, it certainly does. In the Setup menu, activate 'Dualaileron' Then go to the Adjust menu and scroll down to Differential. Wind in what you need..... Pete Ah, forget all that - I see from the vid you are on 35Mhz......... Great job, anyway! Edited By Pete B on 05/05/2012 13:07:54 Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 5, 2012 Author Share Posted May 5, 2012 No I mean a SkySport 6A. No menus no computer just a few dip switches and presets under the battery cover.. The manual does claim aileron differential but it only appears to work when they also used a flaperons so its mechanical differential only. Memo to self - get a modern TX! Edited By Simon Chaddock on 05/05/2012 19:16:45 Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted May 6, 2012 Author Share Posted May 6, 2012 Nicer weather today with some sun. I hoped it would stand out better in the sun.....er......not really, so I have edited out the bits when you couldn't see it!! The picture break up occured during the upload to Vimeo. Depron Hawker P1121 in the sun from Quorneng on Vimeo. Chucked it about a bit more but still rather windy. The difference in the way it rolls left and right is interesting. Edited By Simon Chaddock on 06/05/2012 13:18:31 Quote Link to comment Share on other sites More sharing options...
Tony Bennett Posted May 6, 2012 Share Posted May 6, 2012 wonderful. Quote Link to comment Share on other sites More sharing options...
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