Mini Toons type close-in aerobatics sloper

[Fred]

You should be sorry... Over 12hrs!  :wink:

I'm in for one (I'll check with Eanna - he might be interested too). 1.8m sounds good to me, or anything in the 1.5 to 2m range.
What aerofoil? How about TP42 root, TP29 tip?
http://tracfoil.free.fr/airfoils/t.htm
I haven't looked at these in any detail but they should be very suitable for this type and size of plane.

Aidan

P.S.
The only EPP I have is a little bit of sheet for indoor planes. Where can blocks be got?

Yeah, I know  :oops:  On call for the week for work... Tired!  :cry:
For the profile, well, whatever you want !   Must be thick enough for the spar system though, but I'll check on the plan and come back to you in the morning.

Ok, checked for EPP blocks... Found 900x590 x 150 block for 49 euros... 20kg/m2 + shipping.
Bit more expensive than Bill's link, but we can in theory make an entire model out of 1 block... I check that with the plan.

Have other links for EPP, but prices are roughly the same, or if not, shipping is the killer!
I'm waiting for an answer from a big French company (GTI) who sells EPP to your specs, and were cheap the last time I checked 2 years ago... We'll see!

Anyway, I check the plan tomorrow to see what material we need for a model, can be a good base for people to join the party or not  

I can also build an EPP prototype before deciding! I just need a good friend with a cnc machine      O:)

[Fred]

Fred,
Put me down for one of the models in the first plan you’ve shown on this thread with  4 servo 1.8mtr span wing please

K.

Ok Keith, you're in!  \/

[Aidan]

Thanks for the link Bill.
I know a few EPP dealers, I check for prices and sheet sizes.

So, to make sure, who would be interrested in an EPP VTPR thingy model ? (the one above, or another one... I have the plan for the Minitoon, Padawan (82cm WS though... But I can enlarge it...))

What's the plan? Decide on a spec everyone likes and cut a bunch of wing cores and fuselage profiles?
If that's the plan I'd be happy to go with either the Minitoons or your design. I'd go with the consensus on size but preferably 1.5m or more. 1.8m sounds good.

I gave Eanna a call and he wants in too.

Aidan

[billscottni]

Interested

Funds might be the big hold back!  :cry:

[Fred]

Hi Aidan,

Yep, if everyone can decide to join in or not, I'll move that thing forward, and we can sart to talk about the EPP order for everybody  
I'll post the full plan etc etc of mine to give a good idea of the thing.

I can also enlarge a Swinger, Minitoon if you want, or the Padawan or whichever design you prefer   But my preference will be for everybody to have the same, more like a group project    (and easier to have them cutted, all the same)

I don't mind, I go with the majority for the model  

[Happy Days]

I’m not too worried about which profile we use, as long as I can perform lots of fantastic aerobatics!

K

[Fred]

Fuselage will be straight where the wing seats, so a profile change will be really easy !
Just need to cut the wings with the profile you want, or even 2 sets of wings, et voila  

Ok, so checked with an EPP block size 900x590x150. Lots of room, and enough for 1 model, that include rudder and elevator in EPP too (my original plan used rudder and elevator in Correx).
A few cuts need to be made for the block (cutted in half, and then in small blocks for the various parts).

Here you go :



And a 2 views of the glider :



Of course, you can maybe make 2 minitoons or Padawan in a block (at least !) etc...

I guess we just need to find a cheap ish EPP supplier now ! I'll do a simulation for several blocks (5 or 6) and come up with a pricing. That will give us a base until we find cheaper, if that's possible.

[Fred]

Or more scale to confuse things even further  
Everything possible  



Same fuselage surface etc, but shaped like a Swift. Just the elevator need a rework, but that's easy stuff.

[Aidan]

I much prefer the original fuselage.
I'll post a picture of the fuselage I had sketched in case you're interested. I hadn't done much work on wing and tail placement etc so it might need a little tweaking.

I wonder would we be better off with ailerons at a constant % of chord instead of a strip? Say 30% chord. That'll make the rigid part of the wing root narrower but should be more suitable for variable camber and snap flap. Are we going with the TP42 (root) and TP29 (tip) sections?

What do you use for your drawings Fred? If you use AutoCAD or something else DXF compatible I can send you a copy of my sketches and vice-versa. Also I'd love a copy of the Mini Toons plan!

Aidan

[Fred]

Hi Aidan,

Please do    
I use Turbocad (v17) for my drawings. Can open everything  
I clean up my drawing.

For the aileron's chord, I did that quickly for illustration, as the optimum chord depend of the profile used (like 30% for the TP202 or TP66).

I send you the files for the Minitoons in a minute  

Also, checked for price for 6 EPP blocks :
6 blocks : 276.06
Shipping : 14.95
Total : 291.01

That's if the shipping is correct, sound cheap shipping for a big box like that!  :?:

[Fred]

Mail sent Aidan  

[Fred]

Checked prices again, and that's roughly the same with :
EPP 20kg for the fuselage, elevator, rudder
EPP 30Kg for the wings.

Sound a much better option to me to have the light fuse / tail group, and the stiff wings.

[Aidan]

Here's my fuselage profile sketch. The aerofoils aren't correct.

I agree with you on the EPP weights. Fuselage should probably be 20kg. It might not be a bad idea using 30kg for the tailplane too It depends on the shape and how thick it'll be (and how it's being finished).
Would the fuselage benefit from a spar in the tail boom or do you reckon the EPP is enough on it's own? We don't want it wagging it's tail!

Aidan[/img]

[Fred]

Looking good Aidan!  :clap:

[Happy Days]

So, if one plane takes one block of EPP. And 6 blocks cost 291 that = less than 50euro per plane!

When will you be ordering the plastic Fred? (Do you want the money up front?)

Keith