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Multiplex big lift project (Read 261 times)
RobC
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Multiplex big lift project
06/19/13 at 09:21:35
 
Hi all, I've just acquired an engineless Multiplex Big Lift that I'm hoping to get up in the air soon for aerotowing. To power it, I was thinking of a Zenoah 62 or a DLE55, they seem to be pretty popular in the tug world, is there anything else I should try for that size model?

One other query I have, it doesn't seem to have a wing joiner, just some hooks to join together with elastic bands inside the fuselage. The wing supports connecting the mid-wing to the fuselage are there so I can assemble the model ok, it's just that when any pressure is applied to front of the wings, they move. I've never seen a model without a wing joiner before so I'm a little suspicious as to whether the elastic band approach is going to be strong enough for flight.

Rob
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Andy.Meade
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Re: Multiplex big lift project
Reply #1 - 06/19/13 at 09:57:54
 
Sounds strange, but could be a cantilever type of arrangement I guess?  All the Big Lift pics I came up with online were either one-piece wing or didn't really show much of the joiner. Post some pics!  Cool
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RobC
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Re: Multiplex big lift project
Reply #2 - 06/19/13 at 14:36:48
 
As requested, here are a couple of photos. The first is the tug assembled with the wing supports in place and the wings held together internally with the elastic band.

The second shows the inside of the compartment between the wings. You will see the hooks and the elastic band. You can also see a hole that looks like where you'd put a wing joiner, although one of the wings had the servo extension wire fed through this hole. The extension wire was missing from the second wing.

I had a handy piece of carbon rod that was about the right size for the holes in the wings and ribs but I still wasn't convinced that a wing joiner was meant to go in there given the ribs had no internal sleeve fitted. I'll see if I can get a photo of the inside to show what I mean.

This is probably a question that a fellow Big Lift owner will be able to answer very easily.

Rob
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Andy.Meade
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Re: Multiplex big lift project
Reply #3 - 06/19/13 at 15:04:50
 
Best to get another owner to chime in, but looks to me its a cantilever system then.  Don't try and fly it without the struts!  Cheesy
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COLSON
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Re: Multiplex big lift project
Reply #4 - 06/20/13 at 21:40:53
 
Hi  Rob
Many moons ago I owned a Big Lift kit and like an idiot I sold it but as I recall the original big lift from early 70s was reliant on the wing struts and should never be flown without I do believe the later updated version was changed considerably and no longer required the struts
Wish I'd kept the kit now and the mk1 and mk11 ford escorts I owned and the ect  ect ,,,,,, I'd be rich  Grin

Chris
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« Last Edit: 06/20/13 at 21:41:57 by COLSON »  
 
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Black Spider
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Re: Multiplex big lift project
Reply #5 - 06/20/13 at 22:27:06
 
I have a big lift ii. The wing  band system works fine. I use 4 bands doubled over so the wings don't pull apart. My power plant is a mag Zen 26 and pipe. Bags of power for 1/4 scale glass and some 1/3 scale woodies. I imagine the z62 would make it very nose heavy. A dle 55 is the better option. Matt
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« Last Edit: 06/20/13 at 22:34:24 by Black Spider »  
 
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RobC
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Re: Multiplex big lift project
Reply #6 - 06/20/13 at 23:10:08
 
Thanks for your responses, this has been really good information.

I think I've settled on the DLE55 for the engine, I've been considering an electric start system for it today but I suspect the model won't like the extra weight if the Zenoah 62 is too much.

Once it's flying I think I'm going to make a set of glassed foam wings for it with some massive flaps in.

Rob
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