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The Webbit 'TWIST' the 3 in 1 model

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Richard Harris01/04/2011 23:21:17
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So here is the plan and I am aware that this is not most people 'cup of tea'
 
Something I have always wanted to try is a convertable fixed wing model. In that you can fly it as a fixed wing land,remove the wing and add on a rotor system and fly it as an an autogyro. Maybe even 2 types? one with a DB type short stub wing with counter rotating rotors on each tip and the other as a DC (direct control) head with a single 3 bladed rotor sat on top.
Tomorrow I will make a start on the 'fixed wing' airframe, try and get this complete and flown in a couple of weeks.
If this goes to plan I can then calculate the rotor size needed and the position of of the mast etc
I will try and figure how to add photos when I have some!
Biggles' Elder Brother - Moderator01/04/2011 23:26:38
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This sounds interesting Richard - looking forward to seeing how it works out.
 
BEB
Pat (rActive) Harbord01/04/2011 23:27:44
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Can't wait to see what you come up with Richard. Convert-O-Webbit
Richard Harris02/04/2011 14:10:05
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3 hours work this morning and I now have what looks like a fuselage!
I was not happy when I placed my motor onto the bulkhead is it sat a little too far back for my liking. Having read a few reports that weight is added to most I made up a new bulk head. This is positioned about 20mm infront of the existing one, the original one has been cut out to aid with battery location.
My motor is a lower KV motor as Autogyros fly best on larger fine pitch propellors, this will also help with the the fixed wing 3D stuff (if I could do it of course!)
The one thing that concerns me is that autogyros like to have a bit of down thrust normally inline with the CG of the machine. Not a problem for the AG but how it will effect the Fixed wing version I do not know..only out at the field will tell I guess.
The tailplane was a little over size so I just added a couple of slots in both, no big deal.
 


 
More tomorrow....can we upload PDF'S? I can add my new former if it is of help to others that I have drawn on solid works?
Richard Harris03/04/2011 16:36:42
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Had a couple of hours spare this morning so started on the wing, not yet complete but should manage to get on top of it later this evening. I will be using Emax 12g MG servos through out , I have used a few of these and for their size produce plenty of torque.
Motor is now fully cowled, this is split so that I can get at the motor. You cannot see from these photos but it  will be cooled via a duct opening underneath. I have made the front canopy a removable hatch so as I can fit the battery in and out.
 


 
 
More later

Edited By Richard Harris on 03/04/2011 16:38:02

Big Bandit03/04/2011 22:22:28
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Brilliant Richard, very innovative, and I like the fully coweld motor.

Cheers,

Chris.
Richard Harris04/04/2011 18:53:11
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Cheers Chris.
 
Between finishing work and the kids getting home from school I managed to complete the wing bar for a couple of soft balsa need for the tips at the TE. I have also made up a duraluminium UC, I have widened the track compared to the plan. Autogyros are renowned for tipping over as they take off so a little extra always helps. I have made my rudder larger in size as this will help in 'autogyro mode' (if it gets to that stage!
Will hinge the tail feathers tomorrow and start creating balsa dust in readiness for the covering.
I have to say I am surprised just how quickly the Webbit has gone together, if anyone is 'thinking shall I have a go'..do it!
 



The above photo is the mounting beams for the aileron servo (one each side) sheeted over in 1.5mm balsa to align the surface with the rib capping off strips.
 
More tomorrow (if she lets me)
 
 
Rich
 
 
 
 

Edited By Richard Harris on 04/04/2011 18:54:26

Richard Harris05/04/2011 18:35:59
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The wing is now ready to cover, I am waiting on some Toughlon from Steve Webb Models, he is also sending me another set of ribs for my 'stub' winged version free of charge 'what a great guy!'
I looked through my 'box of shame' for some some wheel spats but the ones I found were way to big and heavy.
With some of that pink B&Q insulation foam I carved up a set to suit (ish) the WebBit, and epoxied a ply mount to them. They were then coated in Liquid Wings and left for a couple of hours to cure, a light sanding and I will give them a coat of primer tomorrow.
Now I have nothing left in the box and the airframe is virtually complete, so I have started to make up the pod that will sit in place on the wing mount.
This will be removable with the use of 'lacky bands', to this pod will be mounted the rotor mast and hopefully the 2 servos needed will fit inside unseen.
Tonight I will try and calculate ...ok guess!..the position of the rotor spindle compared to the 'fixed wing' CG. The idea is to design in such a way that the CG does not change and I can inter change from one to the other.
 
More tomorrow I hope
 



Caught the wife out!!!...she said 'that makes a change to build one with a wing on', with the pod in place her reply was 'not another one! haven't you got enough' . We can never have too many toys
 
Rich
 
BILL PETTIT05/04/2011 21:43:03
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I'll follow you all over your just THAT GOOD I like it so far if anyone can pull it off it's you.
Chris Bott - Moderator05/04/2011 21:51:05
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Looking great Richard.
 
One question, what's "Liquid Wings" ?
Richard Harris05/04/2011 21:58:33
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Hi Bill...hope the op went well mate?
 
 
Chris,
Liquid Wings is a 2 part water based covering that is used to cover models, it will go over foam or wood etc and is self levelling. It gives a hard shell and is really light . Kind of like epoxy but without the smell and it goes off in a couple of hours. My local model shop stocks it , try a google search.
BILL PETTIT05/04/2011 22:02:24
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230 forum posts
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Rich: I would go with a D/C head and lock out the elevator, keep the rudder fictional, Then on the twin rotor let them be fixed and go back to both rudder and elevator. I'm lovin it already Bill
Richard Harris05/04/2011 22:12:21
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2046 forum posts
1886 photos
I was thinking that I could maybe 'Y' lead the elevator up with the pitch servo? I see no reason why it shouldn't work, I have just never tried it
BILL PETTIT05/04/2011 22:26:06
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230 forum posts
75 photos
I have just been surfin around and let me see if I have this project right in my mind. Everyone is using this flying platform just doing there own mod-faction to produce a new fling model. Is that kinda right? Bill
Richard Harris05/04/2011 22:30:55
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Noit really,
 
Here is what its all about
 
 
BILL PETTIT05/04/2011 23:00:13
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OK NOW I UNDERSTAND.That seems to be a nice simple kit and additions to it should be easy. I will stay tuned and keep checking up. The big fly-in at the end Is that something you could attend Rich?
 
Regards Bill
Chris Bott - Moderator05/04/2011 23:09:25
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Yes anyone can attend Bill. Modellers and spectators.
 
Richard, thanks I'll have a scoot around 'tinetrnet for Liquid Wings.
Tim Mackey06/04/2011 08:29:36
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Isnt it the same as liquid sheeting - as reviewed this month in the mag by David?
 

Edited By Tim Mackey - Administrator on 06/04/2011 08:31:34

Richard Harris06/04/2011 14:31:33
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2046 forum posts
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Tim,
Yes that's the stuff , just from a UK supplier and renamed by the looks. It smells very much like PVA. It does add a nice shell to the airframe but it is more as a finishing coat rather than for strength.
Using it on a flat surface is easy but I had problems trying to get it even around a contoured surface. I now mix it leave it for 20 mins so that it thickens up and then apply it, seal the mixed solution and give it a second coat after another 20 mins.
I made an all depron indoor pusher and gave the fuselage a couple of coats of this stuff, it really is resilient to gym walls!
It must be primered at least 24 hours after application or the paint wont dry
When I first received it I thought that the tins were a bit small, but it does go along way.
 
Rich
Chris Bott - Moderator06/04/2011 17:55:25
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Here's the UK company Liquid Wings, they list just a few local hobby shops. My local is one of them Must give it a try. A bit pricey mind you just to try, and they suggest it only has a 6 month shelf life.

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