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» 2019 Llanfair TH Village Fete
BBUM Yak 55 Back Room Maiden Empty2019-07-12, 18:53 by Rich

» Proposals for Model aircraft flying ( CAA registration) April 2019
BBUM Yak 55 Back Room Maiden Empty2019-05-08, 17:49 by Gary M Jones

» Police crash
BBUM Yak 55 Back Room Maiden Empty2019-04-14, 15:36 by Roy

» Bit of indoors
BBUM Yak 55 Back Room Maiden Empty2019-04-13, 16:49 by Roy

» For Sale
BBUM Yak 55 Back Room Maiden Empty2019-03-03, 23:44 by Charles E Cornes

Saturday 7/7/18

2018-07-07, 21:07 by Gary M Jones

I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

Farmer …

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BBUM Yak 55 Back Room Maiden

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BBUM Yak 55 Back Room Maiden Empty BBUM Yak 55 Back Room Maiden

Post by Mark Barnes on 2010-10-02, 20:58

Coming up is the maiden flights of my BBUM Yak 55 when youtube finishes.

BB (barnesyboy) UM (Ultra Micro) Yak 55 had its maiden in my back room tonight so i thought it rude not to share my joy lol,

Those that have been to my house know my back room isnt all that big What a Face

Thanks to Rich for the laser cutting, My wife for not killing me but actualy helping, and the boy for filming

M

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Post by Rich on 2010-10-02, 21:47

get on with it then

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Post by Mark Barnes on 2010-10-02, 22:23


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BBUM Yak 55 Back Room Maiden Empty Re: BBUM Yak 55 Back Room Maiden

Post by Rich on 2010-10-02, 22:36

sound that, what's the setup for us to ponder over

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BBUM Yak 55 Back Room Maiden Empty Re: BBUM Yak 55 Back Room Maiden

Post by Mark Barnes on 2010-10-03, 00:18



Its all the gear out of the Ultra Micro 4Site, 3mm depron, Badley milled out AUW 32g.

Milling was intresting, airframe was 28grm before milling after it was down at 21g, and I didnt do as much as i wanted because i got bored!

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Post by Andy Sayle on 2010-10-03, 11:55

Nice one!

Was the milling all done by hand weith a dremel or something?

Andy

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Post by Mark Barnes on 2010-10-03, 11:56

Yeah Routing bit in the dremel, very hard to keep the depth constant, but it gose through the depron really easy,I need one of the jig things they make would be loads easier with a constant depth.

http://www.tooled-up.com/Product.asp?PID=121529

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Post by Rich on 2010-10-03, 12:22

why don't we try one in 2mm depron I have loads of it & loads of 3mm if anyone wants some

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Post by Mark Barnes on 2010-10-03, 12:42

2mm would be good, get one cut *please

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Post by Mark Barnes on 2010-10-03, 12:44

I would have to change the wing spar then for 2mm, Ive been using a 3mm x 0.5 carbon strip on the LE, would proberbly have to change to a 1mm cross brase, no biggi though

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BBUM Yak 55 Back Room Maiden Empty Re: BBUM Yak 55 Back Room Maiden

Post by Andy Sayle on 2010-10-03, 12:52

I've actually been wondeirng about using something like 2 or 3mm depron, but cut on the laser with all the lightening bits cutout completely. Then cover the depron with some of the thin laminating film to give you the surface back. So the Depron "frame" gives you the structure, and the laminating filmn gives you the rigidity and aerodynamic surface. Not sure if it would work out heavier or lighter than a simple chunk of foam, but I bet it would be a hell of a lot stronger, and do away with a lot of the carbon bracing that is needed....

Is this the Yak55 that I sketched? I'll have a play with the 3D model to see what the weight difference is if it is...
Andy

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Post by Mark Barnes on 2010-10-03, 12:54

BBUM Yak 55 Back Room Maiden Bbumya10

BBUM Yak 55 Back Room Maiden Bbumya11

BBUM Yak 55 Back Room Maiden Bbumya12

Yeah its the one you drew Andy, the total cut out and skin idea ive looked at but the mylar is aparently a bugger to cover and very easy to warp the depron

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Post by Mark Barnes on 2010-10-03, 12:58

Also, did you ever finish the BBAirbender drawing as i cant find it this end

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Post by Andy Sayle on 2010-10-03, 13:03

That's why I would try Document laminating film. It doesn't warp bits of paper Wink

Love the colourscheme, how do you get an airbrushed finish to look like it was coloured in with felt-tip pens? Wink

The MicroAirbender was finished yep, emailed it over on the 22nd feb this year. Will send the DXF for it again now though..

Andy

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Post by Mark Barnes on 2010-10-03, 13:07

no airbrush this time buddy, cant spend 3hrs milling then add the weight back with paint TUT! Rolling Eyes

Cheers for the Airbender!

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Post by Mark Barnes on 2010-10-03, 18:51

Just tried it outside, Small breeze and 30odd gram dont mix Crying or Very sad , its fine though just was horible

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