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Old Sep 08, 2008, 01:43 PM
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Hello Geode,

I working my on next manta.
I purchased smaller accus 400 mAh and it weight is 30g
I will buy the MEGALIGHT's DLG pod and boom, it has the same parameters like the Manta.

Last weekend I was an oldtimer contest in the hungarian mountains, I escorted my clubmates.
I didn't compete, I went to relax and wich was my big dream to try how does the manta soaring on the slopes.
It was amazing, I dropped down into the valley and it was a few seconds on the top of the sky by the wind.
I made banked turns, loops, rools with easily it.
The landing was a little bit difficult for me who has never flown slopes and usually fly on plain.
The manta didn't want to land, but the flaps did the job.

During these days I met some people they liked the manta too.
One of them are interested in DLGs he inspected very detailed the plane, and he said if the wing profile might be thicker I can throw it higher the plane.

What do you think is he right?
In my opinion If I build the wing with a thicker profile it won't glide as good as now gliding, isn't it?
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Old Sep 08, 2008, 03:21 PM
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Samsh,

Sorry to hear that you broke the boom. There are a few threds here in RCGropus describing how to roll the boom. Wish you good luck. BTW, thanks for posting your videos. The last lauch looks very good.

How are the RDS works out? Do you like it? I might give it a try in my next project.

Wyncee,

At 450g for your Manta, it would be just right for light wind sloping. I was thinking about making a Manta slope racer (target at 24 oz) a while back. Your success is a big encouragement to me. Thanks for sharing.

As for airfoil thickness, in general, for a given weight the thinner airfoil has lower drag, flies faster and launch higher. However, there are other variable need to be considered such as airfoil selection, target weight, building material and planform ..... A thicker airfoil could be as competitive as a thiner airfoil.

For other folks, you should have received your printable plan by now. If not, PM me again.

Thanks for your interest in Manta DLG,
Geode
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Old Sep 09, 2008, 11:45 AM
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What wing weight are people getting for the Manta?
I'm shooting for 5-5.5 oz AUW with two servos but I think that it will be tough to make this weight. I'm going to weigh all the wood that I'm using to see where I can cut it down. THe specified wing tips seem a bit on the heavy side. I noticed a few variations and was wondering what the lightest tip construction method seems strong enough?
Thanks,
Ray
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Old Sep 09, 2008, 01:14 PM
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Quote:
Originally Posted by kostuk
What wing weight are people getting for the Manta?
I'm shooting for 5-5.5 oz AUW with two servos but I think that it will be tough to make this weight. I'm going to weigh all the wood that I'm using to see where I can cut it down. THe specified wing tips seem a bit on the heavy side. I noticed a few variations and was wondering what the lightest tip construction method seems strong enough?
Thanks,
Ray
You're gonna make a scaled down version? If not, i'd like to see a 60" manta at 5-5.5oz AUW.
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Old Sep 09, 2008, 01:19 PM
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Sorry, 5.5 oz is the weight of the wing.
AUW target is 10 oz.
Ray
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Old Sep 09, 2008, 01:48 PM
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Both Rendy and my wings are about 150 g (with covering and w/o servo). The best places for weight saving are the Dbox sheeting, aileron and wing tips. Make sure you use the lightest balsa you could get (or make holes as necessary).
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Old Sep 11, 2008, 08:33 AM
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Quote:
Originally Posted by Geode
The last lauch looks very good.

How are the RDS works out? Do you like it? I might give it a try in my next project.
Thanks!

I'm working on the new boom.

RDS looks good, I was scared because of the precision of RDS, but it's okay. The "box" in the aileron must be strong and the inner height must be exactly the diameter of the rod (which coming from the servo). Else it won't be tight enough.
Take care of the hinging, set the distance correctly between the aileron and the trailing edge.
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Old Sep 26, 2008, 12:37 PM
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Im building my second manta, wing is from blue foam, 10x0.5mm precured cf spars, wing joining area is glassed with 2oz glass cloth, and spars joined with overlayed 12k carbon tow. The v-shaped joiner between spars is from 5mm plywood and reaches 8cm to each wing.Wing is covered in 80micron doculam type document laminating film, tail is covered in 60 micron. This time with a proper tailboom not some 6mm arrow shaft.Also its 100% scale, the first one was with 135cm wing because of printing scaling.. The weight in the last picture is 180g. Still to add: ailerons, tail pushrods/pull-pulls and onboard gear (80g).
Ailerons im gonna build up, trying to keep this one as light as i can.
http://gallery.pistik.com/view_album...umName=album97
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Old Sep 26, 2008, 05:41 PM
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Nice job. An interesting idea - build-up aileron and foam core wing. Keep us informed.
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Old Sep 27, 2008, 12:57 AM
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Foam wing for sleeker airfoil thus i hope higher launches. Build up ailerons for extra weight gain.
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Old Sep 27, 2008, 02:13 AM
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martseger63:

Cool!

"Wing is covered in 80micron doculam type document laminating film"

Can You tell mewhat kind of material is this? I haven't heard about it. How do You use it?
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Old Sep 27, 2008, 02:18 AM
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It works like a regular iron-on covering, but with higher temp.
http://www.pldaniels.com/flying/bals...or-models.html
http://pldaniels.com/flying/balsa/la...aft-tails.html
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Old Sep 27, 2008, 04:47 AM
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Thank You very much! Great links! Tomorrow I'll try it!
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Old Sep 27, 2008, 09:19 AM
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The foam wing is crappy :/, the covering ruined it because of high temp, so i think i'll build the original rib wing. While building, i'll still try to fly the foam wing.
Now where's my gluestick and scissors
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Old Sep 30, 2008, 08:46 PM
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Hi everyone I got the wood for my manta yesterday and I started building today! I love this design so far I have cut out my tail feathers and built half of the Balsa pod. I wanted to start with the wing but I forgot to get 1/4sq stock! ahh, I should have paid attention. Oh well. Here are some pics to show my progress.
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