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The Building of the BebBit

BebBit bit by bit

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Lindsay Todd15/06/2011 20:08:45
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BEB get the glue out, no excuses we all expect to see it there!
ps Will this form the basis of a future article?
Tim Mackey15/06/2011 23:21:31
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I got mine from friend, but a few places seem to have them.
Richard Harris16/06/2011 09:17:19
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BEB,
Sorry to hear of the 'bump'. I am sure you will get it repaired in time for the fly-in. You wouldn't think 1/8" difference would make so much difference to the flight characteristics.
Better to know now of the CG position issue.
 
 
Rich


David Ashby - Moderator16/06/2011 17:27:13
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All part of that leccy learning curve BEB.
 
So it's a 'mass repair' for the winter then
 
 
 
 
David Davis16/06/2011 17:54:43
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Hard Luck BEB.
 
I'm just waiting for the wind to drop before re-maidening the wideline Webbit.
 
Judging by everybody's comments they're hot ships!
Chris Bott - Moderator16/06/2011 19:15:46
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I think the "Mass repair" might come after the Fly in David
Biggles' Elder Brother - Moderator16/06/2011 20:40:11
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When I prang one I always find it really hard to get the enthusiasm up to repair it straight away - I usually can't even bring myself to look at it for a while! Then after a couple of weeks I take it out and grasp the nettle.
 
But if I'm going to have this ready (and flown again) before the 25th I'm going to have to knuckle down now. I've only really got tomorrow night and maybe some of Saturday - I'm off to Weston on Sunday. Then I have to hope for at least one flying opportunity before the following weekend - fingers crossed!
 
BEB
Chris Bott - Moderator16/06/2011 21:03:32
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You can do it BEB, I know what you mean about leaving 'em a while but this has to be the exception You know as well as I do that once you start repairing it nearly always isn't as bad as expected.
 
Good luck with the weather at Weston Park on Sunday. I'm still unsure about going myself due to time pressures, and the forecast isn't helping me decide
Pete B - Moderator16/06/2011 21:16:17
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I had a 'dumb-thumbs' with my VMAR Fournier a few months ago - vertically downwards through the trees. Didn't look good - wings snapped in two at joiner, section of l/edge crushed, tail assembly ripped off, flimsy cowling shattered, pilot has broken nose, etc etc - you get the picture...
 
It's been looking at me every time I've walked into the store room - until last week, when I thought, "That's it , you're getting fixed!"
 
Three evenings work later, much less drama than I was expecting and she's now flown four times this week - what would I do without Gorilla Glue? The repairs are stronger than the original now, so get that pot of glue and balsa hatchet out now, BEB, and get cracking!
 
You know you have to.............
 
Pete
Vecchio Austriaco17/06/2011 00:20:17
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Just foud your thread now BEB, And I have to say I had exactlty the same experience with the plane. 60deg up and almost impossible to control. And I had it more than once. But in my case I am sure the battery didn't move.

My theory was rather that the rubber bands were too loose and so the whole wing moved and was responsible for the behaviour. Unfortunately I saw that your version is using screws to fix the wing - this means the theory is as quickly killed as it was created....
 
don't know if it helps - this is the state of my Webbit - and there is also the engine shaft bent and some problem on the fire wall.
 

Weekend is repair time....
martin Rowley 121/06/2011 09:38:42
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Maidened mine yesterday, took a long time to ROG, then shot vertical, used loads of down trim and it still had a tendency to nose up. C of G on the spar, weighs 2 1/2 lb and 300 watts to power it.
Reduced the power and noticed that the plane was more stable, though now had a tendency to dive, so I'm thinking more downthrust is needed. It wasn't too bad on the glide, though I had to keep the nose up to compensate for all the down I'd dialled in under power.
Got the plane down ok, and reset the subtrim on the elevator, tried a second flight, long ROG again, shot vertical into a stall turn at 10'. Vertical arrival. Firewalls gone, but the wing looks ok.
Biggles' Elder Brother - Moderator21/06/2011 12:38:56
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I'm sorry to hear about that Martin These WebBits certainly do pose a few challenges in flight!
 
300W for that weight is certainly not overpowered - its about the same as mine. The behaviour of yours seems remarkably similar to mine. I'm beginning to think that the WebBit is very sensitive to the exact position of the CoG. The slightest movement around the spar seems to produce disproportionate changes in flying trim. Although Chris's eperience with the CoG 12mm back has me completely baffled!
 
BEB

Edited By Biggles' Elder Brother - Moderator on 21/06/2011 12:39:29

Lindsay Todd21/06/2011 12:48:47
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Mmh strange, sounds like the incidence meter needs to come out and check. Certainly mine requires some down thrust on the motor, have added a couple of washer behind the mount so that should help. In the glide it was remarkably stable and flew surprisingly slowly wich was a good sign. I did note a tendency to leave the nose high in left hand turns when under power so it may yet need some side thrust as well but seems minor compared to these problems. I have the CG just forward of the spar by 3 to 4 mm and was about to move it back slightly to improve its aerobatic potential as it seemed quite docile but a little stuck until my TX comes back from HH, due later this week, fingers crossed!
Linds
 
Biggles' Elder Brother - Moderator21/06/2011 12:53:46
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Based on some others (including my own) experiences Linds I would be very cautous in moving that CoG back - although I'll happily watch on Wednesday evening while you do it
 
BEB
Richard Harris21/06/2011 22:24:38
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When I built mine way back then I took into consideration that the WebBit was designed for IC power. The CG position marked is for an IC engine, for me I always take this CG position as with an empty tank. So as a 'guestimut' I moved my CG position forwards about 6mm to compensate the 'full' tank weight.
I have had no flight issues what so ever with the WebBit ( standard fixed wing), its just everything else after!
 
 
Rich

Edited By Richard Harris on 21/06/2011 22:25:15

Chris Bott - Moderator21/06/2011 22:32:23
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Silly question Richard, but doesn't an I/C model use up the fuel through the flight? So it needs to be able to fly just as well with the tank empty?
Richard Harris21/06/2011 22:34:26
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Chris,
Yes, I was just being a bit on the safe side.
 
 
Rich
Richard Harris21/06/2011 22:36:01
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But saying that you just never know if a mistake was made with the CG position? Seems strange that a few are having issues?
Chris Bott - Moderator21/06/2011 22:40:41
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yes it does, I put all my issues down to my V tail, but it seems that's fine now the C/g is on the front edge of the spar
Richard Harris21/06/2011 22:53:23
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Lets just hope others see this that are in the process of finishing and alter their CG position to the safer option.
 
 
BEB, sorry for the hijack

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