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Old Aug 20, 2007, 02:49 PM
.: Looking for Thermals :.
Ricardo RW's Avatar
Chile, Quinta Región de Valparaíso, Los Andes
Joined Jun 2002
864 Posts
Thank you for your answer, one more thing, is it difficult to unglue the ribs that were glued with 3M77?
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Old Aug 20, 2007, 08:24 PM
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Geode's Avatar
San Jose, CA
Joined Jan 2007
795 Posts
I do a very light dust of 3M77 on one side only. It's pretty straight forward to separate the ribs.
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Old Aug 27, 2007, 11:00 AM
.: Looking for Thermals :.
Ricardo RW's Avatar
Chile, Quinta Región de Valparaíso, Los Andes
Joined Jun 2002
864 Posts
I'll give it a try. Thanx!
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Old Sep 21, 2007, 07:45 AM
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martseger63's Avatar
Estonia
Joined Feb 2007
675 Posts
My build isn't going very fast, because of new just started schoolyear, but im enjoyng every moment of it really love your plane designs, those geodetic ideas are just superb, they look great, and fly even better

I uploaded some pictures on Estonian forum's gallery;
http://gallery.pistik.com/view_album...Name=mardi-dlg
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Old Sep 21, 2007, 10:09 AM
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Geode's Avatar
San Jose, CA
Joined Jan 2007
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I love the modifications you made on the wing root areas of using sheeted balsa. Rendy also made similar changes to save some weight.

I can tell from some of the pictures that you're a real weight watcher. What's your wing weight as of now ?

Looks really nice, thanks for sharing.
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Old Sep 21, 2007, 12:10 PM
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martseger63's Avatar
Estonia
Joined Feb 2007
675 Posts
Thanks for your kind words Well it might seem that way, but i think 130grams is tad heavy :/ i think i can shave 10g of by making some lightening holes in elerons.
Edit: i used a better scale, and it showed 125 grams with heavy elerons.
If i can shave 10g off, it will be 115grams, then add servos (2*9g) and covering, i think i can make it in 150grams. Is this weight ok ?
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Old Sep 22, 2007, 10:37 AM
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Geode's Avatar
San Jose, CA
Joined Jan 2007
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Both Rendy and mine came out ~150g with covering but without servo. You're in very good shape and most likely your Manta will be one of the lightest .

If I were to do it again, I'll try to build it as light as possible (but strong enough to match personal launch style). There is plenty of room to add ballast if necessary.

I would recommend holes in the aileron to save weight. I also added FG (or CF) in the cross grain direction on aileron to re-gain the torsional strength lost due to these holes.

Geode
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Old Sep 22, 2007, 02:38 PM
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martseger63's Avatar
Estonia
Joined Feb 2007
675 Posts
Oh, i see, will cf rowings do the trick?
And i should mention my wing is slightly smaller because of printing problems, always my planes are turning out smaller than original, something with printer settings i guess,right now my wing is at 54"
I think it'll fly fine, even with smaller wing.
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Old Sep 22, 2007, 03:14 PM
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San Jose, CA
Joined Jan 2007
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Cf rowing will be even better. I use fiber glass only because I like to keep the wing 100% yellow (CF is highly visible under Icarex) :-)
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Old Sep 22, 2007, 03:56 PM
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martseger63's Avatar
Estonia
Joined Feb 2007
675 Posts
Now i'm a bit confused, should i make circle holes or something like yours? Or something else?

Edit: Oh and also wanted to ask about the aileron travel, quite small?
Also the full flying stabs travel? I decided to use it also, because that way i will avoid wing incidence problems
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Old Sep 23, 2007, 10:48 AM
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Geode's Avatar
San Jose, CA
Joined Jan 2007
795 Posts
Both circle holes or straight slots will work just fine. Twist your ailerons while making holes/slots to decide proper space between them.

For aileron and full flying stab, Dr. Drela's SGII plan is a good reference for maximum movement. Manta has an effective aileron roll rate. Start with something conservative such as ~ 50% of maximum movement then adjust to your liking.
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Old Sep 23, 2007, 01:51 PM
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Estonia
Joined Feb 2007
675 Posts
Ok, thanks.
I think will be finishing manta next weekend or so, because it's going to be a quite busy schoolweek. I've ran out of micro servos. Ordered some, aend will arrive in 2 weeks i guess. Also burnt my rx last night. It was a corona rs610, best i've ever had i just plugged in the battery, it went like puuuuuuff, in half a second, it burned on my desk, one diode inside was burnt,it burned so hot, that there was a hole in the heatshrink
So now i ordered Multiplex rx-5 35MHz, hopefully get it in a week or so.
No need to hurry on my build, i take it slow and natty
Will post some pic's also when something a bit bigger is finished.

Cheers, Mart.
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Old Oct 04, 2007, 04:17 AM
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Joined Feb 2006
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Hi Geode

After much effort I send this direction to you
http://www.miliamperios.com/foro/viewtopic.php?t=82790
where you found photos of the blanket making the first test flights and trim.

I have had to construct my own boon and pod then in Spain is difficult of
to find.

The summary is 320 grams. I am trying to make less heavy other.

This weekend we will make a video in flight.

Thank you very much Jose Maria.
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Old Oct 04, 2007, 10:21 PM
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Geode's Avatar
San Jose, CA
Joined Jan 2007
795 Posts
I love that build-up aileron.

Mine finished at 280g and after a few repairs now is about 300g. Do just fine as before must be that extra large wing area.

Hoping to see your video soon. Thanks for sharing.
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Old Oct 11, 2007, 02:39 PM
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martseger63's Avatar
Estonia
Joined Feb 2007
675 Posts
OK. Finished mine. Covered in oralight. AUW came in 270g but a bit tail heavy, added some weight to the nose to get cg to the spar, now it weights about 300grams. Test flights will follow tomorrow if im lucky with the wind
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