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Sport Planes (Formerly I/C & Gas Conversion) Discuss I/C or Gas Conversions, Aerobatic Planes and Sport Aircraft

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Old 12-13-2015, 03:24 AM   #51
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Tried a few different props. More rpms now.

https://youtu.be/-5Xmeit6pJE


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Old 12-14-2015, 05:21 AM   #52
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I was just digging around in my model storage area and found a GLH kit ready to build.

I guess it was one I had for back up, from 1985. It will be cool to build it with today's equipment.

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Old 12-14-2015, 06:51 AM   #53
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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.
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Old 12-15-2015, 06:16 AM   #54
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I've got some insane Little Screamer motors, they should do the trick.

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Old 12-16-2015, 04:32 AM   #55
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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.
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Old 12-16-2015, 07:49 AM   #56
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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.

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Old 12-16-2015, 05:13 PM   #57
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Mines actually pretty quiet for some reason.
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Old 12-16-2015, 11:22 PM   #58
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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...
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Old 12-17-2015, 01:12 AM   #59
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The only .049 I had ended up on a power pod on a gentle lady. It was the black widow model. I flew it a couple times but it was pretty loud!
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Old 12-30-2015, 11:05 PM   #60
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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.
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Old 01-12-2016, 01:04 AM   #61
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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:

https://youtu.be/zVgaiCA9bvg


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Old 09-11-2018, 05:53 AM   #62
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covering a GLH old stock kit, foam wing tonight!
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Old 09-11-2018, 05:54 AM   #63
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dusty old topic eh ! LOL
Had to look up what he used for an ESC 40 should be fine 1300mah 3 cell. 2826 2200kv
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Old 09-11-2018, 10:34 AM   #64
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Got any photos of yours Oz?

Take care and thanks for posting at WattFlyer!!

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Old 09-11-2018, 08:27 PM   #65
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Default GLH

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.


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Old 09-11-2018, 08:32 PM   #66
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Talking GLH

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
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Old 09-11-2018, 08:36 PM   #67
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Tulip Slick fabric paint works well with mini roller or it leaves brush strokes.
Cheap at Wally World
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Old 09-12-2018, 01:47 AM   #68
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Thanks! You should be able to see that one and keep orientation. Looks great!

Take care and thanks for posting at WattFlyer!!

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Old 09-12-2018, 06:50 PM   #69
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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)
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