Tailless F5D Limited? Multibumm! - Page 3 - RC Groups
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Feb 20, 2007, 02:40 PM
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Ken Park's Avatar

Tail-less racer - Stealing from Combat boys!


Your Tail-less blog give me hope Iam on the right road with my own tailless pylon model.

Our group in Ottawa Canada is into Piker class or introduction racers designs - strickly speed 400 stuff 180"sq wing area !

I've been kicking around of using a basic layout of SPAD combat design called "Draco" This thing fly's fast and smooth. Iam now drawing up a 36" wood version for a speed 400. I hope to get to the building stage by March.

Test flights set for this spring!
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Mar 25, 2007, 04:39 AM
I plan to take over world
sayno2glo's Avatar
Quote:
Originally Posted by biber
We are indeed planing a molded Mubu II which should be suited for F5D.
But at the time being we have lots of other work to do,
so nobody even knows when a first proto might get airborn.

biber
Me and few others are going to build mubu's for f5d setup. Have you designed the f5d configuration more? The motor b40 would be in the nose. Do you think it will work? Especially CG?
Where can I find the wing sections?
Thanks,
Antti

(Edited version )
Last edited by sayno2glo; Mar 25, 2007 at 04:44 AM.
Mar 26, 2007, 05:18 AM
Registered User
Florrain's Avatar
Hi Antti,
Do you intend to build bagged wings or hollow molded ?

Francois
Mar 26, 2007, 06:31 AM
I plan to take over world
sayno2glo's Avatar
Bagged wing was my intention. I'm not sure if this is stable enough to fly f5d course well so I'm not going to build molds.
Apr 04, 2007, 05:52 PM
Needs brain lubrication
biber's Avatar
Regarding the Mubu1, take the MH44 and modify the camber to 1.1% and the thickness to 8%.
That's not the original airfoil, but it's very close to it.
And it even seems to rather outrun the original Mubu sections, in Xfoil aswell as in real life.
The guy who designed the original sections doesn't want them to be published.
So we decided to test a kind of open source alternative to it.
And the MH44 mod. is just that.
As I said, it is tested and we were surprised how well it came out.
The sections for the planned Mubu II are even derived from that one too.

The right CG position will be hard to maintain with a pull prop and a small wetted surface at the same time.
That was the main reason for us to go with a pusher.
But of course, having to launch power off to save fingers and nerves,
we also clearly see some good reasons for a pull prop there.

Anyway, nice to have some others interested in the Mubu style of wings.
And though I wouldn't claim it to be superiour to other (common) configurations of models,
it certainly is different and that's what we wanted to do in the first place.
However we are happy to have a wing that does not seem to be too handycapped by missing the tail,
but rather can compete with the best state of the art tailed ones in F5D Limited.

biber
Apr 04, 2007, 06:47 PM
Caution:Makes sharp left turns
Troy's Avatar
Still watching biber...
Jul 22, 2007, 09:42 AM
Needs brain lubrication
biber's Avatar
Update:

Now we have the bottom halfs of the female premolds at the workshop.
The top halfs will follow soon as they are getting milled right now.

It will take us some time before there will be a prototype flying,
there are some other tasks to do in the meantime.

The premolds are getting sealed by epoxy resin a few times.
Then they'll get their treatment with mirror glaze, or W70 maybe.
The gelcoat surface of the proto built in that premold will need some finish work after release,
but that will be easier to achieve, than to finish the premolds female surface.
The premolds are made from polyurethane filled with aluminum chips.

In case the Proto meets our expectations,
we'll pull gelcoated male plugs incl. parting planes off the premolds,
finish them right up to shiny bling and pull the final female molds.

Sounds complicated maybe, but keeps risks at minimum.

biber, quite happy with it so far
Jul 22, 2007, 12:29 PM
Ain't Dutch? Ain't Mutch!
Kimble_Schmitz's Avatar
Pictures!!!
Jul 22, 2007, 02:57 PM
Needs brain lubrication
biber's Avatar
I'm just back from the workshop.
Have smeared some epoxy again, to seal the bottom premold surfaces.
Next step is waxing it and doing the same things with the top halfs that should arive here by tomorrow or so.

I had the plan to take some pics, but left the camera at home.
I realised that just when I arrived at the workshop,
wich is 30 minutes from home, going by bike.

But I'll attach some pics of the premolds being milled
and some aditional stuff.

biber
Last edited by biber; Jul 22, 2007 at 05:47 PM.
Jul 22, 2007, 04:29 PM
Registered User
Florrain's Avatar
WAY TO GO BIBER!!!
Yipiiiiiii This is the MubuČ year!
I want one, I want one, I want one...and Iwant one
...
Did I mention that I wanted one?

Keep us posted Biber
Jul 23, 2007, 08:03 AM
Needs brain lubrication
biber's Avatar
Wilco!



biber
Jul 24, 2007, 05:54 AM
Speed King
MarkChinery's Avatar
that looks nice...


I want one, like others reading this thread.

Years ago i built a flying wing Speed 400 pylon model which was a plan from a guy in germany. cant recall his name but the wing was fast.
Last edited by MarkChinery; Jul 24, 2007 at 06:29 AM.
Jul 24, 2007, 06:14 AM
Registered User
how fast do these tailless f5d wings fly ?

looks good, i also want one
Jul 24, 2007, 09:08 AM
Needs brain lubrication
biber's Avatar
Wow, nice comments!

My personal estimated time table says, it will be still some way to go,
to get planes popping off the molds on a regular basis.

I think, we will get a proto or two airborn this year and
have the final molds in service by early next year,
to be prepared for the next competition saison.
And we will only make final molds,
if the proto at least roughly meets our expectations.

And then of course, after Paul, Tom and I have pulled ourselves some models,
there are still at least one very supportive german buddy and Florrain
(and aswell Uitgeslapen, I guess) on the top of the list,
until it might come to your turn.

So hang on, it will surely take some time,
but is only delayed, not at all deleted.

We don't expect or prepare for any serious business.
In the end it's still a very specialised affair.
However, in case there would suddenly popp up a
severe demand, that we were unable to satisfy,
I guess we could still contact Francois to solve that issue,
as he is gone that way more than once and knows the hows and whys.

Almost forgot to answer the speed issue:
It is supposed to be in the F5D range.
The specs are just right for the FAI rules,
as we plan to fly this thing on competitions.

biber
Last edited by biber; Jul 24, 2007 at 09:13 AM.


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