Good reflex airfoil for a flying wing.

[cyclops2]

Does anybody know of a good reflex airfoil # that I can use on my 60" Avro Vulcan ? Plans show a close to Clark Y type.
The foil will be flown as slow as possible on a Buddy Box set up with people who have never flown.
Maximum speed is the last interest. Internal electric ducted fans.
Low speed and " O " stall speed is the highest priorty. Any such foil exist? can I get a copy of it ? The plans are not showing a C. G. What is typical for a Vulcan type wing.?
Thanks. Rich.

[DIALED/CHUCK]

Clops,

First off...good to see you.

There are a lot of great foils for this kind of app; mind you...I know the LEAST about foils of anything in RC...but I fly predominantly wings, so I have talked with a heap of makers...and by and large what I hear is that the foil, while most important, is only given it's true performance when the sweep, crd, and thickness are 'married'. Most wings I have flown have nearly no tip-stall and they will flop over in an axial manner and then catch themselves if they are ever given too much elevator.

Most wing-makers keep their foils pretty much on the down-low...but I did run into a guy last year at NEAT with Bergen Couty Silent Flyers who was flying that he said was a 225 foil...it was a 25 inch wing with a teeny lipo and tiny feigo motor. He was giving away the specs pretty openly and you might be able to catch him on their site: great bunch of fellas.

I know you could pretty much put a fuselage on a flying wing...Electric Jet Factory's Bob-E-Cat is an excellent example of that...and it has almost no stall...

Sounds like what you are doing is fun...keep us all posted.


--C

[cyclops2]

What is a little un-nerving about the big Avro Vulcan plastic model is that the rear of the model has a definate Reflex across the rear of it. The leading edge of the center wing section has a rapidly developing undercamber only in the very front 10 %.
The small outer wing section has a definate washout across it.
It seems like the modelmaker at Hasegawa Models had actual plans of the plane.


Should I take a chance and copy his contours?
The 60" plans have a flat bottom Clark type used on tail planes.

Edit.I think I may strike out on the Saab J-35.
I am grooming the Vulcan as a replacement.
Which current Wings fly very slow with great low speed control. I might buy it and copy the foil to get it right for the practice plane.

[DIALED/CHUCK]

Hey Clops,

Unfortunately, it is getting a little 'over my head' at this point. There are some EPP cutters out there who you can essentially "Send in your specs" and they will cut a core for you for about 20-60 bucks depending on the job....

Then you might be able to sheet it...or send it to a balsa cutter and have them cut you a skeleton; though I know no balsa cutters...only EPP magicians.

Hope someone else can help more...

--C

[flypaper 2]

I still fly, occasionally, a Hustler Delta I built back in the mid 60s. Takes off and lands like a 747, very nose high with no sign of a stall. Stable at very slow speed. Sort of a Clark Y with a sharp LE at the root and rounded at the tips. Much of it is inherent in delta wings. Another goody is the Avro Arrow. Flat topped wing with the foil on the bottom. Reflex follows the bottom of the wing. Looks like the wing is on up side down. Outer LE is drooped.

[cyclops2]

Flypaper. I Will go with you and the plans Clark Y.
Any % of a balance to take into the tall grass for hand tossing?

[G_Countryman]

Say, Clops, why don't you try www.utahflyers.org (http://www.utahflyers.org) they have got several types of foils, but their club uses just one type, can't recall right now, but it is a combination of two foils, and yes, they will cut you a couple of wings for around $13.00 + for the set.
I sent a friend of mine out there in Utah a couple sets of blank EPP, and they cut the wings for ten bucks each, and then helped him (advised) him on how to put them together, and he never flew anything but a SS, and handled the wing like a pro.
Gary

[flypaper 2]

Sorry Cyclops, missed the question in your last reply. Old tired eyes I guess. :p Flying wings and deltas are between 15 and 20% of MAC. I build a small glider around 12 in. wingspan to find CG. Here's a good CG figure outer

[cyclops2]

RC site gave me a good lead. And when I entered the plans numbers and used 22% for MAC, the plans CG was within 1/2" of a 30" main chord rib location.
Put on my full respirator mask and SAND. :) :) :)
The Billet weighs 7# now. I figure a hollowed fuse and wing should total out at 3 to 4# :eek: .

[cyclops2]

I found the CG on the plan AFTER I removed a piece of blue masking tape.

DUUUMB????:o

[cyclops2]

Where should I put a post for powering this critter at not over speeds for buddy box training the General Public in up to 10 mph wind.
Plan on 2 or 4 fans that have 3.75 " of space. I could just mount motor and rotor with internal flow straightners?

I just Hijacked my own thread.:D

[mark dimonte]

I have used an eppler 226 stretched a little and added relex with the ailerons. Just leave both ailerons up a dgree or two at neutral. This helped my Avro Arrow.

[Farm Flyer]

If you build washout into the wing tips and try trimming your elevons/ailerons up a bit the delta should be stable. I have seen many flights on free flight deltas with this system.

[cyclops2]

Thanks for the help guys.

Rich