Cool. I had an ace catalog long time ago and remember seeing the plane in there. I wonder how it would work with one of those neu motors that do like 200mph. I'll stick with the cheap motors that are slower.
I'd like to see a chart on watts vs speed. From what I've read, it seems that the people with the big name motors are trying to pull around 70amps with 4s batteries or more and not getting much run time. This gets them like 140+mph depending on design. I think once you get to 120mph, it's a big wall of air after that. Watts go up exponential. I'll probably go to 4s and see if I can get an extra 10mph. I'm only pulling 40 amps on my 3s pack.
I believe air resistance probably go up by the square of speed, or maybe exponentially, which may be the same.
I don't know how a chart could be set up because there are many variables.
Anyway, it takes a lot more power to go faster and faster. We had a boat that went 47 mph with only a straight 6 motor, but if we had tried to go 94, it would have need a supercharged V8.
High speed planes need to be as streamlined as possible, look at the 200+ mph pylon racers, the wings are not much thicker than our GLH's.
Speed is fun in the right place, I had a F-27 Striker with and over sized motor, it hit 125 mph level, and was probably doing 130 when it tried to dig a hole in the Wyoming ground. It was so dang fast and loud I couldn't fly it at my home field.
Dave R, KI7MTA Proud PGR rider.
When you have flying skills like mine,
You become a master at repair.
Fun thread. I built a GLH 20-odd years ago (kit, foam wing) and flew it with a TeeDee .049 - no throttle. I never clocked the speed but it was the most fun I ever had with an .049. Until the day I pulled a high speed loop and the receiver battery decided to exit through the oil-soaked bottom hatch. The GLH did 4-foot loops, a bit lower each time, until it tried to enter a cloud (cumulus dirtus.) I actually had time to turn off my transmitter, collapse its antenna, and enjoy the final show...
I have a 4s battery coming. I have most of the small prop sizes and just need to keep it under 55amps static. Actually all I need is 40amps or around 550watts for 4s. Anything less then 5 minute flights isn't worth it.
I tested my motor on 4s and its pulling 48 amps easy on a 4.75x4.75 prop. Not fully charged. Took a few tries to balance the prop. Changed the spinner nut out too as it was shaking. Didn't do any thrust tests. Too scary! It's faster yes but not ballistic. Todays run:
ultra coat on the wings and the stripes in the fuse. The rest is painted with Slick fabric paint. The gray will have 2 more stripes. White forward against the black and black rearward against the white.
The ultra coat on the wings and the stripes in the fuse. The rest is painted with Slick fabric paint. The gray will have 2 more stripes. White forward against the black and black rearward against the white. The uneven lines will be covered by the additional stripes
Thanks! The GLH is an easy build even from scratch. This one is from a kit but our club has winter time "Build Nights". Several were built from scratch.
This GLH II was a foam wing version. The foam wing was thicker so I used my hot wire to make it the same airfoil as the plan built GLHs. Otherwise it is stock built per the kit instructions.
I don't care for the coverings appearance at the wing center, a black strip of covering same width as the fuse will fix that as well.
OzMo (Ozark, Mo)
I have most of the small prop sizes and just need to keep it under 55amps static. Actually all I need is 40amps or around 550watts for 4s. Anything less then 5 minute flights isn't worth it.
GLH
Linear Mode
