Replies to This Discussion

ModeratorPermalink Reply by Morli on March 28, 2010 at 5:15pm

Next to the nose cone there is a block of wood, any idea what is that?

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3D RoboticsPermalink Reply by Chris Anderson on March 28, 2010 at 7:46pm

I think that's the battery.

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ModeratorPermalink Reply by Morli on March 28, 2010 at 8:18pm

looks like it , must be Mil spec pack :-)

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ModeratorPermalink Reply by Morli on March 28, 2010 at 5:10pm

Chris M ,
I liked you boomerang parachute release mechanism. any videos of it deploying in flight? Is the cord/servo wire that seems to be attached to the hatch means the release servo attached to hatch or is it just the retaining cord so that you don't loose the hatch when deployed? the spring is pretty fast and almost sounded like explosive bolt :). I liked your Manta 1 too. cheers

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Permalink Reply by Chris McNair on March 28, 2010 at 5:32pm

Morli,

The Boomerang.... Poor airplane... RIP. The FEDS kept this one from everybody enjoying. The spring that shot the hatch off the bird was from a 1/8 scale RC buggy. It was the shock spring. The hatch pin was released by a servo which was attached to a servo lead. The system works perfectly and overcomes any aerodynamic issues that would cause the hatch to stay in place. The Manta/Devil Ray is a great bird that fortunately I built specifically for FPV. That particular bird is going through a V2 on the CFD and design. As most designs there were a few things we saw needed improvement. From an aerodynamic standpoint I found a few things that I wanted to address for max L/D. One thing people do not know is something as simple as a top hatch can change the efficiency of an aircraft dramatically especially when we are designing a flyingwing. I will do my best to explain why certain design thoughts will not be the best solution to our aircraft. I do not claim to know everything but can say I have spent over 100k and 10 years of my life dedicated to Aerodynamics with a few aircraft and patents under my belt. Anyhow I want to sit back and hear everyone’s thoughts before I open my big mouth…..

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ModeratorPermalink Reply by Morli on March 28, 2010 at 8:16pm

good idea ( using buggy shock spring), :)
FEDS ??!
waiting :)

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ModeratorPermalink Reply by Brian on March 28, 2010 at 5:32pm

I think the boom is attached with a twist-lock that is spring loaded. The block is the battery.

Regarding deep stall and the wing coming off. If the wing were to need to slide into the mount from the front then wouldn't it require forward inertia to be able to come off. The forward motion of the deep stall would keep the wing seated. I think that a good rare earth magnet would keep it secure.

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ModeratorPermalink Reply by Alex on March 28, 2010 at 10:14pm

I tent to lean towards a single boom setup however it does not really make much difference. The key thing to start with is to choose a base electronics package based upon the mission requirement, ie choose battery class, engine class, esc that would best match mission profile.

I think the biggest problem with this is that we all want an aircraft that has everything for everyone which is not possible. We should perhaps lay out a few different key design specification options and put them on a poll. For an example we should post a poll asking different questions such as single/twin boom, high wing/low wing, pusher/puller , foam/balsa/composite. I think it will also be important to list the pro's and con's of each design choice so we have a fair vote. After this we will all have a focused design specification that will not be final as we might go along and find that one of the key choices will change, but it a good way to start in my opinion, otherwise we might have a year long discussion with nothing ever getting done.

I can volunteer to do this over the week?

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Permalink Reply by Sarel P. Wagner on March 29, 2010 at 12:15am

I did some work on airframes and wing mounting, quite a departure from the norm ;)

Here the wing is sitting on top of the fuse.

Wing on top

In this example the wing is midships:

Wing mid ship mounted

Here the wing is clear above the fuse on a pylon, commonly referred to as a Parasol wing:

Chris, remember the file I sent you about the criteria, when we have Huddle workspace, I can upload it there or if you still have it, you are welcome to do so. The file name was Cat II UAV design draft and it contained the following:
Overview
Rules
Missions
Requirements
Plan forms
Performance criteria
Basic Design selection
Manufacturing consideration
Design & Performance prediction
Performance verification
Design Alteration & finalization

Rgrds

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ModeratorPermalink Reply by Morli on March 29, 2010 at 2:38am

thats fast Sarel :-)
One Parasol wing for me pls ;-)
I like the looks of PTERYX UAV and the way mechanics is setup except the camera which seems in venerable position for any type of nose in but I am sure designer must have thought of it too. The puller/tractor configuration issue of being in the way of camera and pitot tube has been taken care and has advantage of using standard props too, seen this config in one another UAV some were. tail wing looks like it is full control surface , so might hav deep stall feature too!! Good job krzys.

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Permalink Reply by Sarel P. Wagner on March 29, 2010 at 2:44am

In my defense Morli, been working on this, off and on, for quite some time ;)

Rgrds

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Permalink Reply by Dan on April 25, 2010 at 5:42pm

Hey Sarel just wondering if that software is yours or if you got it off the net?? if you got it off the net would you let me know of the Adress???

Cheers
Dan

P.S. looks good!! :)

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