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Old Dec 24, 2004, 05:22 PM
Gene Bond is offline
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Gym-Blu Simple Indoor Lightweight Stick Plane


I needed a replacement for the PFC I trashed the other day, for our inddor flying and to fly in the street out front on calm evenings and mornings.. So, here you go!

28x8 wing, 5oz using std Pico Gear & IPS w/ 2s ET250 pack.

It's a floater!

Edit, 1-8-2005: Add 1/8" additional incidence on front of wing. Makes it more stable at even slower speeds Files are updated.
Last edited by Gene Bond; Jan 09, 2005 at 12:35 AM. Reason: Updated Plans!
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Old Dec 24, 2004, 05:59 PM
snowball1288 is offline
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did you say 5 ounces? holy cow...
How does she fly?
is it really slow?
wind abilities?
does it fly in a gym?
Old Dec 24, 2004, 06:38 PM
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Phantastic! I want to build one - looks like the perfect "toss off the back deck" plane. I've been looking for a plane just like this one - something to fly in the backyard & also at night under the really tall parking lights at the local industrial park (they have several empty parking lots, very well lit - this plane looks perfect).

Thanks for posting & happy flyin',

Buzz
Old Dec 24, 2004, 08:24 PM
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Quote:
Originally Posted by snowball1288
did you say 5 ounces? holy cow...
How does she fly?
is it really slow?
wind abilities?
does it fly in a gym?
Yup, 4.1oz w/o battery
Peel all the skin off the Fan Fold. Go easy on the glue. Heat treat / Temper tha foam for strength.

Slow Yea, a 2 mph wind and it'll harrier! Still can stand a little more wind, though, due to fairly low drag. Maybe 5mph would be ok.

A gym will be no problem!

Edit (2-15-2005): Just so it'd be on the first page, and since I can only attatch 5 files per post, I'll post the Dome-Blu Plans, here. It's a blown up version, 440 sqin, per GPW's suggestion for a little more power and weight with the same wing loading. You can find the discussion and development further down in the thread.
Last edited by Gene Bond; Feb 15, 2005 at 07:27 AM. Reason: Add Dome-Blu Plans
Old Dec 24, 2004, 09:01 PM
dayhead is offline
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Gym-Blu looks great! I especially like the large tail surfaces, looks like you're one of the few who realise the value of plenty of tail area at very slow speeds. Keep UP The Good Work!
Old Dec 25, 2004, 07:55 AM
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That's pretty COOL!!!! An indoor we can enjoy without resorting to "Swedish' Watchmaking "... NICE!!!! and just in time too ....Thanks G/bond .... again !!!
Old Dec 26, 2004, 10:24 AM
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OK!!! I got the plans.... now , if I build it light enough , do you think it would fly with the LPS system ???? blue gear ... 7x6 prop ???
Old Dec 27, 2004, 07:56 AM
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Here is a thread on another plane that is along the same lines. It uses an LPS and Split FFF. The Simple Split Stick
Old Dec 27, 2004, 08:20 AM
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“There’s no place like Foam”
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What are you using for a dihedral brace , if any ???
Old Dec 27, 2004, 11:22 AM
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Quote:
Originally Posted by Gene Bond
Yup, 4.1oz w/o battery
Peel all the skin off the Fan Fold. Go easy on the glue. Heat treat / Temper tha foam for strength.

Slow Yea, a 2 mph wind and it'll harrier! Still can stand a little more wind, though, duse to fairly low drag. Maybe 5mph would be ok.

A gym will be no problem!
Gene, what is the procedure you use to temper the foam?

Thanks,
Sleedo
Old Dec 31, 2004, 12:10 AM
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Sorry guys, just got back in the country tonight... vacation in the tropics w/o internet, but with sun, surf and cervesas!

Quote:
OK!!! I got the plans.... now , if I build it light enough , do you think it would fly with the LPS system ???? blue gear ... 7x6 prop ???
Should be enough... I was using a 9x4.7 on an IPS-A, so down a prop size. The 8x4.3 may be better, though, with the same loading on the motor.

Quote:
Here is a thread on another plane that is along the same lines. It uses an LPS and Split FFF.
Hmmm... I didn't weight the airframe without the gear, but an ounce and half is a lot of weight savings. I just wonder about the wing strength.

Quote:
What are you using for a dihedral brace , if any ???
Nada, I formed it, bent it and and tempered it. You could actually try to do a nice smooth curved dihedral, but it'd need more tip hight for the same effective angle. The 1.5" is about 6 degrees., so maybe go 1.75-2" tip height.

Quote:
Gene, what is the procedure you use to temper the foam?
Basically, you heat treat the surface of the foam. Using a heat gun, you keep it moving across the surface, watching the surface as it just starts to melt, and becomes a little shiny... It seriously strengthens the foam, without making it excessively brittle.
Old Dec 31, 2004, 12:20 AM
sir crash alot is offline
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The wizzard is back welcome home Gene !!!!!!!!!!!!
Old Dec 31, 2004, 07:15 AM
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“There’s no place like Foam”
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You missed the SNOW (even here!),luckily we had BEER .....
The GYMBLU (sounds like a rap star) will be a nice platform to test thick vs. thin UC airfoils ... at low speeds ... something we need to know more about ....
Old Dec 31, 2004, 10:36 AM
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Oh, we didn't miss the snow, or the cold, just the thaw... -8 degrees and 12-20" of snow... returned to 60 degrees and mud

I drew this up with the 4/40 wing chamber, and I like it. The PFC had about 10% underchamber IIRC. Maybe I'll make up a 10% wing to compare. Have to take a WAG at the flat chord, or get a drawing done first. I did make up a few 4/40 templates as part of the project, so maybe I should do some 10/40's as well. Should be able to just scale the X axis...
Old Dec 31, 2004, 11:51 AM
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Gene,
Can you post a link to the full page plans if you have them. Thanks


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