jan A. Posted January 30, 2011 Share Posted January 30, 2011 Covered the wings, going a well visible color sheme (dark red/gray). will do the same with the fuse over the next days, awaiting the edf parts to arrive. so far so good, not perfect but well enough for a first try Quote Link to comment Share on other sites More sharing options...
Ton van Munsteren Posted January 30, 2011 Share Posted January 30, 2011 Looking good Jan keep up the good work. Ton Quote Link to comment Share on other sites More sharing options...
jan A. Posted January 31, 2011 Share Posted January 31, 2011 Parts arrived at the cabinet today, and tested the setup this evening. I put myself on a budget for this one to keep the misses accepting this money pit of a hobby. esc HK 60 amp 14$motor; Turnigy Typhoon 450H 2218H Heli Motor 3450kv 13$EDF Ducted Fan Unit 6Blade 2.75inch 70mm 6 $ (Its a gamble, I know maybe I will stil change it to the HET 6904 fan) BEC 3a 4$3770 20c 4s lipo 35$ total 72$ 800watt, 58 amps, motor runs hot at full throtle, but will be fine just if i don't run it too long at max. I will let you guys know what gives out first Jan Quote Link to comment Share on other sites More sharing options...
jan A. Posted March 2, 2011 Share Posted March 2, 2011 Hi, It has been a while since my last posting, working alot, and been on skibreak so the build slowed down a bit; been back on it this weeked though finnished the fuse underneath, built in the servo, but provided only one elevator servo pushrod. I'm used to doing that way, will work just fine. did not place the esc in the exhaust, so hope it won't get too hot, we'll see. Pushing out a nice 1200gr of thrust. hopefully not much less than the auw the covering turned out to be a lot of work, the next one will certainly be in fiberglass.glued the wings on, and managed to spill glue on the nice new wings, will have to recover a patch still some covering underneuth to do, fixig all the control survaces, the cockpit,... Quote Link to comment Share on other sites More sharing options...
jan A. Posted March 28, 2011 Share Posted March 28, 2011 Maiden ! Finally found the time and then the courage to maidenn the yak. A totally horrible event in wich you attach your beloved project to a bungee and catapult it away. To limit the amount of stress I do it alone, so there is a video, but nobody was holding the cam. coditions were good, sunny ad a steady light breeze. Learning from tonys experience I put the Cog half a cm before the plan cog (+-3.5cm from LE) Launched it with zero throttle out of fear of it pitching up violently (the power coming from underneath does not reassured me) lauched straight like an arrow.... Flew like a trainer, only faster, but what a ice thing to fly, slower than my f20 but far more elegant. one drawback , on the 3rd flight I managed to put it in a flat spin, powered my way out of it, saved the plane, blew the motor ( wich I saw coming) Rememberring that edf's need speed, and not to fool aroud too much with them So I'll be replacing the motor, wich means open heartsurgery. But this gives me the chance of remake the botton wich does eed to be reinforced, oracover is just not enough. Now I can also finish the details like cockpit an decals. Never do easthetic work on a plane that does not fly you know Cheers Quote Link to comment Share on other sites More sharing options...
jan A. Posted March 28, 2011 Share Posted March 28, 2011 Here is the lik to the vid http://www.youtube.com/watch?v=AQUtnlUW6-g Quote Link to comment Share on other sites More sharing options...
Ton van Munsteren Posted March 28, 2011 Share Posted March 28, 2011 Jan, Congrats on the maiden Iam glad you like it , the Yak is a great plane to fly. Ton Quote Link to comment Share on other sites More sharing options...
TonyS Posted March 28, 2011 Author Share Posted March 28, 2011 Fantastic Jan. Well done. As you said, it flew like an arrow. I'm even more convinced that it is the insane power of the motor that caused the violent pitch upwards on mine. Must be time for a flight methinks...... Tony Quote Link to comment Share on other sites More sharing options...
Smoggie Posted December 14, 2022 Share Posted December 14, 2022 Sorry to bump an ancient thread but I just picked up this kit. Just looked over the plans and it all seems nice and straightforward enough build, except maybe the battery hatch will need some creative thinking. Am I right that the original battery install needed the wing to come off to remove the battery? The other thing that I noticed is the CG position appears to be WAY far forward. I've not done a calculation of where it should be yet but the layout of the model is very conventional with a decent size horizontal stab, so I'd expect a CG in the 30% root chord ballpark. As shown on the plan it's more in the 15-20% range (more the CG position for a tailless model). CoG this far forward (as well as making the model likely to run out of elevator at low speed and land too fast) will make it hard to balance with a sensible size LiPo. Anyone who has built and flown the Yak have any comments? Quote Link to comment Share on other sites More sharing options...
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