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        Mini-HowTo FMS 1400mm BF-109F Bash and repaint

#1 Tom Hunt Jun 29, 2012 10:39 AM

FMS 1400mm BF-109F Bash and repaint
 
1 Attachment(s)
Hi Guys

Since I guess I have already done a bit on this model, I should start sharing.

I bought the "kit" from the fruit company some time ago when it was offering free shipping.

Things I plan to do:

Make a new scale tail assy: The model is way oversize in the vert/rudder and the horizontal is a bit oversize (and way too thick!)

The oil "chin radiator" is too deep. It is approaching the size of the "G" series.

Repaint

maybe some other small things we'll see.

Lets get started:

#2 Tom Hunt Jun 29, 2012 11:14 AM

new tails
 
9 Attachment(s)
I started by lopping off the old vertical tail tangent to the top of the fuselage at the LE of the vertical. I then shaped out a new scale vertical stab.

I shaped out of some rather high density foam (like "spider foam" but still a little denser) a new set of horizontal tails and inserted two 6" long 1/4" carbon tubes into the foam to attach them to the new vertical.

The elevators (and soon the rudder) was first cut out from 1/8" balsa and then I glued DOW "blue-foam" to each side and shaped with a corase sanding board.
Later these will be joined with a 3/32" wire joiner to only require one pushrod to the elevator.

#3 Tom Hunt Jun 29, 2012 11:17 AM

chin scoop mod
 
3 Attachment(s)
The chin scoop is a little on the "deep side" for an "f" model, so I cut it off, and buried it a littel deeper (about 3mm) into the fuselage

#4 Prowler901 Jun 29, 2012 11:24 AM

Beautiful work as usual Tom. I look forward to your progress on this one. she'll be a beauty for sure.

Todd

#5 GiusedtoBe Jun 29, 2012 06:21 PM

Subscribed

#6 bullworm Jun 30, 2012 02:06 AM

nice work

#7 Tom Hunt Jun 30, 2012 09:28 AM

paint stripped
 
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I stripped the paint (most of it anyway) with acetone. The greeen and the yellow came off easy. The gray is just not effected! must be a different paint.

I "tacked" it together for a couple of shots.

additionally I will be shortening the aileron (inbd) and lengthening the flap (outbd) to make them more scale size. The aileron hinge was broken in transit, so I just lopped them both off.

#8 Randbo39 Jun 30, 2012 10:23 AM

I used lacquer thinner on mine. It took the grey off as well.

#9 Tom Hunt Jun 30, 2012 10:30 AM

motor mounted
 
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Although I may change my mind, it was just too convenient to mount an AXI-4120-20 (465 Kv) (roughly equivalent to a 5055 though they do not make a kv that low yet). The axi prop adapter comes already threaded for the 3mm spinner retention screw. An EMP, Aeolian or Turnigy woulnd need to be tapped in my lathe.

I made a .5" thick X mount extension and glued and screwed it to the existing firewall, though I did have to add a piece to the top side of the firewall for support.

I first glued the cowl on without the right thrust (I don't believe in it) and then routed the hole in the front big enough to pass the motor witht he x-mount installed.

I also (AND I STRONGLY reccommend everyone do this regards of motor chosen or cell count) threw away the crap chinese screws that retain the prop to the backplate and tapped the backplate for 4-40 (3mm would be good for the rest of the world). I then installed 1" long 4-40 screws AND washers.

#10 Tom Hunt Jun 30, 2012 11:51 AM

Quote:

Originally Posted by Randbo39 (Post 22037989)
I used lacquer thinner on mine. It took the grey off as well.

I might have some around.. I'll try it.

#11 MPS86 Jun 30, 2012 01:28 PM

Tom you might want to try lacquer thinner on a scrap piece first. Acetone evaporates much quicker than lacquer so it more than likely will not eat the foam. I know foam in packaging found boxes will dissolve with lacquer not sure about EPO foam though. Mineral Spirits or Naptha might also work but a little pricey just to get paint off.

Matt

#12 Randbo39 Jun 30, 2012 02:41 PM

Yes, definitely test first. I don't want to be responsible for any disasters but I've used it on two FMS planes and had no problems. The problem I had was the fumes attacked my plastic lens glasses so be aware and have very good ventilation if you do it. And of course protect that nice tail mod. I don't think Pink or blue insulation foam will stand up to it.

#13 Tom Hunt Jun 30, 2012 03:07 PM

Quote:

Originally Posted by Randbo39 (Post 22039629)
Yes, definitely test first. I don't want to be responsible for any disasters but I've used it on two FMS planes and had no problems. The problem I had was the fumes attacked my plastic lens glasses so be aware and have very good ventilation if you do it. And of course protect that nice tail mod. I don't think Pink or blue insulation foam will stand up to it.

No worries mate. been a modeler (RC) for nearly 40 years... I always test! more than once!

I had a can of "Perfect" paint thinners, it did not take the gray off, nor did it harm the foam.

#14 Randbo39 Aug 07, 2012 01:00 AM

Been working on it lately?

#15 Tom Hunt Aug 07, 2012 05:46 AM

no, sorry,

Wife is finally getting her new kitchen after 27 years in the same house. I'm doing everything except the electrical and countertop. I should get back to it soon. I brought the Mk12 Spit to work so I could at least get something done during lunch in my lab.

Tom


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