The Nova is grounded while I figure out the APM troubles I'm having, see these posts for the details:
http://www.diydrones.com/profiles/blogs/auto-land-testing-and-a-sad-apm?xg_source=activity
In the meantime, I'd like to announce the Raptor! It's going to be a 48 inch wing span flying wing designed after the very successful Ritewing Zephyr. If it performs well it will get an APM as well and be tested alongside the other airframes for efficiency/flight resilience.
Should be a great entry into flying wings and help me consider it as an option for my USA trip airframe. I'll build it, maybe maiden it next week!
-Trent
Comments
If you want washout in your cut foam wing, try distorting the foam stock the opposite direction to the required washout before you cut the aerofoil. The finished cut should spring back close to the washout you need.
Here's a spreadsheet that you can play with to figure a few things out
http://www.rcgroups.com/forums/attachment.php?attachmentid=3905587
BTW, I've had a good long look at flying wings and convinced myself they aren't the holy grail that they first appear to be. Still great fun to muck about with and they do have some advantages, but there are better efficient airframes out there.
Worth considering part-span elevons in your design rather than full-span, IMHO.
@Ryan, Marko : How do you add the twist to the wing while cutting it out of foam? I generally cut wings using hotwire (which is what most people do, i think). Kindly tell me the way to incorporate twist in the process.
Thanks
Saad
Don't forget to add twist also! The tips should drop a few degrees.
DIYD Team: You guys are awesome. I apologize for the delayed response... today has been very busy.
I've never had such a difinitive response before: No Clark-y on a flying wing! Thank you everyone for steering me in the right direction. I'll consider closely all the options and suggestions you all have made, it will take a couple days, there is a lot to review!
Thank you again for your all your support. Ramon got it right: "When I see this kind of thread were everyone try to contribute with someones idea.. uff! DIY community rocks!" I couldn't agree more.
-Trent
Thanks for the video,simplifies how to build a wing from scratch.Cant wait to see your wing.
Gary is right. Don't use that airfoil for a wing. You need something like an MH62 or there about. You need to buy profili.
it's an air foil data base and simulator. It generates polar graphs and such.
Hi Trent,
As always, I enjoyed your post. I really like your systematic approach at figuring things out...
In line with some of the comments above: Clark-Y is not a good airfoil choice for a flying wing since it has a pronounced pitching moment.
Have you looked at the program XFLR5 for designing your wing? Google it, it is a free program that allows to design and do very detailed analyses of model aircraft/wings. I designed and built a flying wing on it a while ago and its flight characteristics seem to match pretty well what the program predicted (well, at least as far as I can tell - so that may or may not mean anything ;-) ). Here is a screen shot of the wing in XFLR5:
And this is what the (almost) final product looks like (I have added some foam pieces to blend the center box with the wings a little better):
The airfoil is cut out of foam and covered in fiber glass. I worked in a twist of about 5 degrees from the root to the tip - this adds a little to pitch stability.
Anyways, I am sure you will figure something out that works for you, just thought I'd point you to a real cool and useful program...
Marko
When I see this kind of thread were everyone try to contribute with someones idea.. uff! DIY community rocks!
Trent about the APM I had a similar issue, contact customer service, explain them your problems as you have done here and believe me they will do their best to help you, send your board the service is fast and they always update you via email with the diagnosis and further steps to follow.
Since I'm also very interested in a flying wing, actually i'm planning to buy a Zephyr II for FPV , ill subscribe to this thread, keep it going!
Ryan is right, MH62 is the way to go. Make sure you do this bit http://fwcg.3dzone.dk/ standard platforms are very forgiving, wings will be pigs until you get the CG right. Most people that struggle need to put just a little more weight on the nose. Two servos only, how simple can you get ;-)
Here is how we laid out our last one
Oh yes, you will need to think a bit about motor mount angles you can end up with all sorts of weirdness ;-)
If you want to fold your own wing to experiment with try one of these http://www.mugi.co.uk/
there is a free plan there, I built a two meter wingspan one once they are great.
DO not build too heavy, it will be a pig to launch,
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