Multiplex Big Lift II  
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All Forums >> RC Airplanes >> ARF or RTF >> Multiplex Big Lift II
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Multiplex Big Lift II - 1/15/2008 9:05:01 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		Good evening gentlemen (Europe time ),

I finally started this plane that has been waiting around for some time now.

I post about it 'cause it will be a testbed for a few new things for me, so I'm sure I'll need some advise here and there.

I already have a question!

I don't like to cover such a large bird with Monokote film so I'll end up glassing the fuse and... what about the wings? They're open frame, what can I use so that I'll be able to paint them?

Is SIG KOVERALL an option?

or any other 'fabric' covering?

Thank you,

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Giacomo 'g_boxwood' Bosso
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RE: Multiplex Big Lift II - 1/17/2008 6:52:42 PM   
jooNorway


 

Posts: 755
Joined: 12/23/2004
From: Naersnes, NORWAY
Status: offline 		My BigLift II got a glassed fuselage too.
The wings got GlossTex, which didn`t need any painting.
I have never used Koverall (yet) but it sure works. But since weight isn`t an issue on a BigLift I prefer covering with glue on... no need for Balsarite.

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RE: Multiplex Big Lift II - 1/17/2008 9:33:46 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		Thank you for the infos,

I'll stick with OraTEX wich is a fabric covering by Oracover, it doesn't need any painting as it is glossy by nature but I'll paint it to match the fuse (it's a multi-color scheme which I don's want to do with coverings).

What servos did you use?

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Giacomo 'g_boxwood' Bosso

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RE: Multiplex Big Lift II - 1/18/2008 5:55:02 PM   
jooNorway


 

Posts: 755
Joined: 12/23/2004
From: Naersnes, NORWAY
Status: offline 		Mine got Hitec HS-605`s for all rudders in the wing, but I think these servoes are discontinued by now.
625 and 635 for the elev and rudder if I am not wrong. 605 for the tow-release. Receiver; MPX DS-IPD 9 synth, never failed
Moki 30ccm gasser up front.
Durable plane which have served well for some years!

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RE: Multiplex Big Lift II - 1/23/2008 8:53:04 PM   
wrob


 

Posts: 152
Joined: 1/30/2004
From: Apple Valley, CA, USA
Status: offline 		Anybody know where I can find a Big Lift II in the USA? I'd like to buy one.

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       Post #: 5

RE: Multiplex Big Lift II - 1/24/2008 7:51:17 AM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		Did you check with Multiplex USA?

I see they dont' feature the BL on their products... give them a call and see if they could import it for you.

Or check the Graupner TAXI 2400 which is almost the same (a little bit better).

MPX USA dealers:

http://www.multiplexusa.com/WTB_files/wtb.htm

< Message edited by g_boxwood -- 1/24/2008 8:02:17 AM >

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Giacomo 'g_boxwood' Bosso

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RE: Multiplex Big Lift II - 3/17/2008 6:22:23 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		I've been working onto this project on & off in the past few months and I thought I could share what has been done so far.

First let me say that I'm not fond of kits so you can guess by yourself how much I do love ARFs... nonetheless I didn't want to invest any additional time and resources other than those provided in the package (something I paid for) in working out all the things I didn't like.

I just replaced a few hardware items (the tailgear unit and the control horns) and I just added a little bit of mine in the assembly process. Nothing more than that.

As I said I paid for it the way it came...

The assembly starts with the wings and they consist of 2 panels each, the inboard constant chord panel and the outboard one.

Inboard Wing Panel

The first thing to do deals with the wing strut anchor plate: the Big Lift design doesn't employ any wing tube! The wings stay where they belongs thanks to the wing struts, a few steel alignment pins (that slide into brass tubes glued to the fuse) and some heavy duty rubber bands.

Check out the following picture:



the wooden block on the left is what actually supports the 4 self-tapping screws that hold the anchor plate in place; next to it is the custom triangle stock I added to support the balsa strip that goes flush with the anchor plate itself.



The funny thing about it is that another balsa strip is required to properly seal the area around the anchor plate otherwise the covering material wouldn't have anything to stick to: I added another triangle stock to support the second balsa strip (no mention about it nor it is included)...



... and I then added the second strip:



Don't skip this extra step or there won't be any support for the covering material!

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Giacomo 'g_boxwood' Bosso

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RE: Multiplex Big Lift II - 3/17/2008 6:38:30 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		Outboard Wing Panels

The OWP simply require the modeler to add the wing tip blocks: I used aliphatic glue for the job and I then sanded them to shape with the ailerons in place.



The rest of the assembly involves both the inboard and outboard panels.

First I wanted to enlarge the holes in the ribs so I could install some paper tubes to route the servo wires.



I used a Dremel tool fitted with a snake extension:



I then planned how to mount the wing servos: each 645MG is secured to a 2mm thick G10 hatch with hardwood blocks epoxied in place:



The sheeting is then removed and an inner 1/16" birch-ply frame is epoxied to the sheeting from the inside (see previous pics):



Four hardwood blocks are then added at the corners to better support the screws that hold the hatch in place (see following pics).

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Giacomo 'g_boxwood' Bosso

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RE: Multiplex Big Lift II - 3/17/2008 6:45:23 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		Next the 2 panels are joined together with 30' epoxy and a 1/8" lite-ply brace:





Please note that the original design calls for the wingtip block to extend past the the fixed portion of the wing: I didn't like it and I cut the block adding it to the aileron:



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Giacomo 'g_boxwood' Bosso

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RE: Multiplex Big Lift II - 3/17/2008 6:55:41 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		Wing Control Surfaces

I started with sanding the control surfaces to match the wing section (they didn't on their own as they're stock):



Next I chose where to install the flap hinges and control horns:



As I said I replaced the original horns with Robart's Super Horns as I felt them to be more suitable for a project of this size.

I wanted both the flap hinges and the horns to bite onto harder wood and to spread the loads onto a wider surface so I embossed the control surfaces (both the tops and the bottoms) and added 1/16" birch-ply plates:





Everything is then sanded again to match the wing section once more:



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Giacomo 'g_boxwood' Bosso

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RE: Multiplex Big Lift II - 3/17/2008 6:59:16 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		The same applies to the wing TE:



Bottom view:





I also added a lite-ply stiffener sandwiched between the reinforcement plates:





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Giacomo 'g_boxwood' Bosso

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RE: Multiplex Big Lift II - 3/17/2008 7:05:17 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		Both the wing and control surface are then sanded together once more for a precise and definite match:



The wing panels are then checked for simmetry and the fixed portion plates are drilled for the flap hinges: do not drill the moving surfaces yet, wait until they have been covered!



One last fancy 'corrective' job is to fill the aileron hinge slots with some scrap balsa as they were cut really too wide (both the TE and the aileron stock):



Don't forget to add the balsa blocks supporting those hinges...



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Giacomo 'g_boxwood' Bosso

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RE: Multiplex Big Lift II - 3/17/2008 7:12:04 PM   
g_boxwood



Posts: 341
Joined: 1/28/2005
From: Torino, ITALY
Status: offline 		Final wing prep deals with filling and sanding...

I also painted the wood with Graupner BALSA-FIX...



... and I started covering the wings with white OraTEX:





I really liked that covering material (first time) while I felt something was wrong with the BALSA-FIX: it turned out extremely thick and slimy out of 2 new bottles and I had to thin it a lot to get it to a paintable viscosity... maybe I got 2 old never-opened bottles...

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Giacomo 'g_boxwood' Bosso

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