Timo Starkloff Posted November 23, 2020 Share Posted November 23, 2020 Looking very nice Good luck for the first flights! Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted November 24, 2020 Share Posted November 24, 2020 What a great model Robert, you must be really pleased with that. Quote Link to comment Share on other sites More sharing options...
J D 8 Posted November 25, 2020 Share Posted November 25, 2020 Looking great and with all that wing area should be a nice steady flyer. Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted November 25, 2020 Author Share Posted November 25, 2020 Thank you Colin, Yes I am very pleased with how it turned out and quickly it came together. JD8, thank you and it was the wing that caught my eye, I did think that it should fly well with the wing/fuselage ratio almost a powered glider. Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted December 6, 2020 Author Share Posted December 6, 2020 Hi All, I have weighed the model in it's flying condition and double-checked the position of the CoG, I don't want a repeat of my FW200 Condor. The CoG came out at 70.5mm from the leading edge which is just about 1/4 root cord. So the all up weight is 5 3/4;bs or 2.6kg giving a wing loading of 24.6 oz/sqft Altering the static margin by 5% either side of 10% move the CoG So with a static margin of 5% moves the CoG back to 83mm from the leading edge And with the static margin increased to 15% the CoG moves forward to 64mm I will balance the model at 70mm as a starting point for th emaiden flight, which will not be for a while, I went flying today and our patch is very waterlogged and has been cut up by an off-road motorcycle/s which made take off and landing a challenge. That's all for now Regards Robert Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted March 24, 2022 Author Share Posted March 24, 2022 Hi All, Today was the day that I maidened the Junkers. Here's how it went. All the control movements were guesstimated and having a Spektrum radio I had three rates available to me so I set them up as low medium and high. The engine had not run for a couple of years and was fired up almost straight away with no adjustments needed with plenty of power, range checked so all looking good. Being an unusual model it gained a lot of interest from my fellow club mates, I handed my camera over to our chairman for some flying shots. So off onto the newly mowed strip, weather conditions were good sunny skies light wind. Take off no1. nosed over after around two feet, wheel went into a rut. The u/c may be a little too far back, as soon as the tail gets above level she will start to nose over without power. so back to the pits to restart and try again. Take off no 2. she flies but OMG, the rates were all on low and the ailerons were not effective and not enough speed and she ended up in the rough very ungraceful One of the advantages of band on wings that plus a low speed arrival. On checking over the model and all seemed well with no apparent damage done. Take off no3. After a short break the model was lined up again and this time I had all the rates set to high. Take off was fairly short having to keep up elevator to try to stop her nosing over but as soon as she was in the air I backed off well she was a real handful needing a lot of aileron trim and flicking the elevator trim to medium Whilst I was trying to trim out Ian got taking some flying shots The colour scheme looks good in the air It was shortly after this photo was taken that disaster struck with the right wing coming off leaving the aircraft crippled and uncontrollable all I could do was to close the throttle and collect the pieces. On bringing back to the pits and on examination the dihedral brace had sheered, damaged undoubtedly by the previous arrival. Note to self use thicker ply for braces. So that is it the end of another model, at least the engine is ok and I have salvaged all of the electrics for another model. That's all for now Regards Robert 2 Quote Link to comment Share on other sites More sharing options...
Graham Davies 3 Posted March 24, 2022 Share Posted March 24, 2022 Sorry to hear this Robert. Sounds like you are due some luck. Quote Link to comment Share on other sites More sharing options...
Robert Parker Posted March 24, 2022 Author Share Posted March 24, 2022 Hope so Graham could do with some. Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted March 24, 2022 Share Posted March 24, 2022 All I can say is .. ? Quote Link to comment Share on other sites More sharing options...
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