Hempel 50% BD5 Build
#26
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Hey guys...been out for a couple days....To answer question....I like the plane...I like it even better now that I put a 370 GYRO on the elevator....Made things way better.... No video yet .....working on it.. Will have it at Joe Nall
Bill
Bill
#30
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I would suggest you open the box at the FEDEX office before you sign for it. Mine had some damage to the canopy & vertical stab. Bill is sending a new canopy. I have the wings done. Check the ail & flaps, they have little holes already drilled for the horns. you can't see them under the film. I have the stabs done. They also have marks where to drill, look for them. Ask Bill for construction pics, he has a bunch. They help a lot. I'm putting a K-140G in mine. As far as the thrust problem goes, it looks like all you can do is keep the pipe & the front of the turbine as low as possible so as to have the thrust angle pointing upwards as it leaves the tail. This will push the tail down & get rid of the nose over problem. Mixing up elev with full power also is an option. I will be glad to answer any questions you may have as you progress. Don Heath
#31
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Just got a long E from Bill H about the thrust problems. He said on his next one he would lower the turbine 1 -2". The swiss have a 50% BD-5 also. There picture show the turbine way down as compared to the normal rail position on this one. Think I will make 2 wedges to bring the front of the turbine down about 1 1/2". Painted the front inside of the fus white, looks a lot better. I'm putting all the air tanks & valves & bat. way up front. Bill said he added 2 1/2 # of lead up front on his to get the CG right.
#34
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It's been along time, I thought this thread was dead. A long story short. Don;t screw around with lowering the turbine as I did. It went in 20 sec after lift off. Lowering the turbine caused it to rotate all on it's own & went up at about a 40 degree angle. All the down elevator was not enough to get it flying, The end result was a pan cake impact. Turbine & radio ended up OK. It's being rebuilt, although I've lost interest. The CG is where Bill had his. The stab & wing were at 0 degrees. If I had not listened to Bill I still would have a BD-5. Advice , leave the turbine where it's supped to be, & put up with a little nose down at full power. So far no $ return from Bill for his bad advice, don't think I ever will see any.
#37
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Make sure you re-glue the wing rib in the fuse and double check all the glue joints just to be safe. I am running Hitech 7955TG servo's on everything, and I set up two servo's for the flying stab positioned on the back bulk head right behind the turbine. Everything else on mine is pretty much stock. I haven't flown my new one yet, now I have to wait until the snow stops flying and things dry out.
#39
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I test flew one of these for a friend… To trim for level flight at about medium power was around 20% down elevator. It just looks odd to have that much down, so we unwisely re-centered it for the second flight… shot up and had to use a ton of down trim again. If you fly it at one throttle setting, it is ok, but then that pesky part about landing comes up…. Reduce or increase throttle and you have a roller coaster. Good times….not.
#40
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How are you balancing this plane. Fuel tank full or empty? I noticed that the tank is behind the CG, if you balance it empty when you take off you would be tail heavy, which might account for some of the trim problems encountered. And if you balance it full you would land nose heavy, which might not be too bad. I will look to see if I can slide the tank further forward above the CG. Input anyone?
#41
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Glad to find this thread I'd love if possible to see a blow buy blow build on this one. Having had a couple of Bills big planes I'm quite interested, hell I've even thought about making the pusher prop version till I'm happy to try out Turbine power for the first time, figure I can sort the bugs out in the airframe. Buy the sounds of it the gyro on the elevator is definitely the way to overcome the thrust line issues.Look forward to more information..
cheers Rossco,
cheers Rossco,
#45
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I have 4 flights on mine, the first two were kinda shaky. It does fly different, but I am very satisfied with the plane. My CG is a little nose heavy at the bolt hole in the fuse. I also moved my tank forward to where it is centered on the CG. If you build as per instructions the whole tank is aft CG.
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Hi All,
I have almost completed my BD5 but note with a K140 mounted on the rails the elevator pushrods foul against the motor. What have others done or do you have to relocate the elevator servos, advice and pictures would be appreciated.
Also those that have flown did you balance with the tank full??
thanks
Peter
I have almost completed my BD5 but note with a K140 mounted on the rails the elevator pushrods foul against the motor. What have others done or do you have to relocate the elevator servos, advice and pictures would be appreciated.
Also those that have flown did you balance with the tank full??
thanks
Peter