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Old Jan 29, 2011, 11:31 PM
In the 20' glider range
anti-gravity's Avatar
Boise, Idaho
Joined Jul 2009
4,503 Posts
Build Log
20' Foam Glider.

Hello World.
http://www.youtube.com/user/all4flying?feature=mhee

Karl K thought it would be a good idea for me to start a build log.

Just so you guys know, I don't prefer to type long posts. So most of mine a short and simple.

Basically. To sum up the whole plan. I am making a 4x, (AKA 20 foot) foam glider.
The design I am building from is springers OSG.
http://www.rcgroups.com/forums/showthread.php?t=1138106

Springer designed this airplane for 60'' (5feet).
I have built a 2x version of this airplane. It flew, it flew great.

So, yeah.

I plan on using a mix of pink (4'x8'x1/2") foam, and dollar store foam (20"x30"x1/4")

I plan on using a KFM3 airfoil.

The wing will break apart in 4 pieces. Each measuring in at 5 feet.
The fuse will be one complete piece (i think), measuring in at just under 9' (8' 8").


All the measurements will be 4x springers design.

I will have "struts" on the bottom of the wing, possible the top. In this case I guess we could call them guide wires

I plan on using CF TOW in the wing and fuse area.

I will continue to update this build log with my progress.


I do need some help though.
Power system? I am going to run it off 3s. What motor? ESC?


What about servos? Am I going to need to use metal geared. Pull-pull system?

Any engineers out there... Where is the best place in this wing to add CF?

Would it be better to do a V dihedral, or what I have now




Please feel free to share ideas about structure in the wing. And ideas for making the wing joint separable.
Share any ideas, the more the better




Here are some pictures to make you wanna build one yourself.

~Cole
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Last edited by anti-gravity; Jun 20, 2011 at 11:42 AM.
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Old Jan 29, 2011, 11:50 PM
Micro Boat Forum Founder
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United States, GA, Buford
Joined Nov 2007
6,496 Posts
Whose house are you trying to bomb? You must really hate them.

Awesome!
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Old Jan 29, 2011, 11:53 PM
In the 20' glider range
anti-gravity's Avatar
Boise, Idaho
Joined Jul 2009
4,503 Posts
LOL.

Thanks. I think I can make it for under 100$ too. Who knows.
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Old Jan 30, 2011, 12:20 AM
Yes, "that" Karl...
karl k's Avatar
Canada, BC, Burnaby
Joined Mar 2007
1,680 Posts
I like how the pic with the plane parts on the ground shows the guy who got hit by this monster!

Looking forward to seeing this grow from an idea to a plane.

Any ideas on the AUW?

I have an idea for the wing spar. Since it looks like the wing will end up being 1-1.5" thick, a spar made of plywood would be good. Up here, I buy 1/4" plywood normally used as sub floor to make spars from. If you used this and made a 6" half lap joint where you need to join any pieces, it should be plenty strong.

Plywood will also alow you to make the spar right through any dihedral.
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Old Jan 30, 2011, 07:50 AM
Thermal Chaser
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subbed
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Old Jan 30, 2011, 10:20 AM
In the 20' glider range
anti-gravity's Avatar
Boise, Idaho
Joined Jul 2009
4,503 Posts
Quote:
Originally Posted by karl k View Post
I like how the pic with the plane parts on the ground shows the guy who got hit by this monster!

Looking forward to seeing this grow from an idea to a plane.

Any ideas on the AUW?

I have an idea for the wing spar. Since it looks like the wing will end up being 1-1.5" thick, a spar made of plywood would be good. Up here, I buy 1/4" plywood normally used as sub floor to make spars from. If you used this and made a 6" half lap joint where you need to join any pieces, it should be plenty strong.

Plywood will also alow you to make the spar right through any dihedral.
Thats an idea. I could easily sink that into the wing. Hmmmm..

I have no idea on the AUW. I need to go get some of this foam to find the weight. Then I could crunch some #'s and give a guess..
My guess as of right now is 8lbs
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Old Jan 30, 2011, 10:38 AM
Enough Power? -NEVER ENOUGH!
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North-Eastern Saskatchewan, Canada -Eh?!
Joined Apr 2008
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this looks great! i can't wait to see more!
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Old Jan 30, 2011, 10:45 AM
In the 20' glider range
anti-gravity's Avatar
Boise, Idaho
Joined Jul 2009
4,503 Posts
Thanks.

It will probably be about 2-3 months before I actually start building. There is a tremendouse amount of designing I need to do before I can start.
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Old Jan 30, 2011, 11:03 AM
Micro Boat Forum Founder
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United States, GA, Buford
Joined Nov 2007
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You need to make a smaller model first.
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Old Jan 30, 2011, 11:11 AM
In the 20' glider range
anti-gravity's Avatar
Boise, Idaho
Joined Jul 2009
4,503 Posts
I have build a 10ft version of this exact airplane.

Here are some pics of the "rough" airfoil.

On my 10ft one I build the airfoil like the second picture, following measurements from the LE.


In the first picture I just carried the lines straight through.

Which one is better?
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Old Jan 30, 2011, 11:22 AM
Advanced District5 Champion!
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In the vicinity of the midwest.... home of large lots of land to fly in!!
Joined Mar 2008
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the second one is better. the first one promotes a tip stall.
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Old Jan 30, 2011, 11:59 AM
In the 20' glider range
anti-gravity's Avatar
Boise, Idaho
Joined Jul 2009
4,503 Posts
Ok. that is what I was thinking.
Here is my rough idea for my fuse.
Sides will be make out of the 1/2" pink foam. The top and bottom out of either DS foam or pink 1/4"
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Old Jan 30, 2011, 12:32 PM
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What motor are you going to power it with?

Four motors that come to mind are:
TGY 80-100 130kv
TGY 80-100 180kv
TGY CA120-70 150kv
TGY CA80-80 160kv
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Old Jan 30, 2011, 03:15 PM
Build straight - Fly twisty
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Australia, QLD, Little Mountain
Joined Feb 2010
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Borrow the motor out of the lawn mower
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Old Jan 30, 2011, 03:30 PM
In the 20' glider range
anti-gravity's Avatar
Boise, Idaho
Joined Jul 2009
4,503 Posts
Those just seem like to much power to me. But I think I will need them to counter-act the drag of my wing...

Honestly I will keep these motors in mind. But I will probably not even think about what ones till I start building, otherwise I will never be able to grasp the size.


LOL IM GOING CRAZY!!!!
~Cole
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