RE: BT Bf109E-4 (Full Version)

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Flying Canuk -> RE: BT Bf109E-4 (7/24/2006 8:34:04 PM)

Tubig

This is a great build thread. When I tackle these plans myself I'm going to use this thread as build instructions. You have given us some great tips and pointers along the way. I hope that the other's that have contributed will continue to do so as well.

Tubig you have a great looking airplane coming together, I hope you will keep posting all the way through with some video of the maiden when its complete.


Thanks
Brian



tubig -> RE: BT Bf109E-4 (7/25/2006 3:55:08 AM)

thanks brian, i appreciate the nice words. i will continue to post (as long as i continue to progress [;)]). i had hoped to complete this one within a year but it looks like it's going to be much longer. however, i am in the detailing phase now and i just have to decide how much of that i want to do.



tubig -> RE: BT Bf109E-4 (7/26/2006 12:32:31 AM)

filled in some smaller areas that needed to be touched up on the wing. nothing really to show there. but i also added a couple small details to the fuselage before finishing the priming/sanding stage. i added a small hole on the right side forward fuse that was used for the engine crank handle which was just opened up with a round file. and i added a hole on each side of the rear fuse which was used to insert a bar for raising the tail. for this i cut a 1/4" piece of 3/16" aluminum tube and sealed one end with balsa. this was then inserted into holes opened up with a round file.




tubig -> RE: BT Bf109E-4 (8/19/2006 3:39:20 PM)

today i closed the gap between the wing fairing upstand and fuselage. really not necessary because there is a fairing on the full size that covers this gap but it also helps the wing to seat better. i used the ol tried and true monokote dam/microballoon filler method. i applied monokote to the fuselage sections at the rear and along the fuselage side of the wing/fuse gap and at the forward ply former that mates with the cowl. troweled on the microballoons to the wing side and screwed on the wing.

pic 2: close up after drying and sanding.



tubig -> RE: BT Bf109E-4 (8/19/2006 3:42:28 PM)

while the 'balloons were were drying i went back and recovered the tail control surfaces. when i covered them originally with Skyloft i managed to dope the tissue to part of the trailing edge of the fin and both elevator halves giving a scalloped look to them which was REALLY ugly. any i cut out the Skyloft in the open bay areas, lightly sanded and put on Solartex. i'd heard good things about Solartex and wanted to give it a try. it's good stuff. i think i'll get more.



tubig -> RE: BT Bf109E-4 (8/20/2006 12:34:37 PM)

a little more accomplished today. added the wing/fuse fairing from 1/32" ply (the last of the laser cut parts). and finished sanding the bondo from the fuse and wing.



tubig -> RE: BT Bf109E-4 (8/20/2006 12:43:17 PM)

i also started working on the fairing pieces on the horizontal stab. since the horizontal stab's incidence could be adjusted it had a fairing between the horizontal and vertical stabs. BT used lithoplate for this but i've not been able to find any in asia (probably not asking the right question) so i used K&S's soft .005" aluminum. first i bent a 3/32" wide strip at a right angle and then cut off the strip after measuring out another 3/32". then using a ruler i pressed the aluminum piece in place and ca'ed it down to the horizontal stab only and again using the ruler pressed the opposite piece against the fin. i've only done the bottom of the stab so far but i think it's gonna look ok. just need to see how it looks with primer on.



tubig -> RE: BT Bf109E-4 (8/25/2006 12:59:55 PM)

finished the top of the stab fairings along with a shot of both sides from the front. the little bit of aluminum in front simulates a small trim piece on the prototype.



tubig -> RE: BT Bf109E-4 (8/25/2006 1:09:26 PM)

got a head start on the wing cannons. started by drilling a 1/4" hole in the wing for the cannon to sit in and then widened it out to 3/8". and the beginnings of a MG FF 20mm cannon. it won't be permanently installed until after leaving the paint factory. i will probably have a small stub glued into the wing for the real cannon to slid into thereby making it removable.



tubig -> RE: BT Bf109E-4 (8/25/2006 1:14:40 PM)

finally for today i permanently glued on the horizotal stab struts and began work on the strut "boots". to make the boots i layed out several layers of masking tape and cut out a mask to fit around the strut ends. then i troweled on some 'balloons. now for the tedious work of sanding to shape.



tubig -> RE: BT Bf109E-4 (8/26/2006 12:50:48 PM)

here are the finished boots after an afternoon of sanding. just needs a little putty to fill in some pins holes and some areas that pulled away with the tape.

and thought i'd thrown in a couple of motivational shots (for me anyway as i'll be taking a couple of weeks off from this for now).



acontreras -> RE: BT Bf109E-4 (8/26/2006 10:14:53 PM)

Hmmm, that's an interesting spotted cammouflage paint job I haven't seen before... :)

Antonio



tubig -> RE: BT Bf109E-4 (8/27/2006 1:32:59 AM)

[:)] that's funny antonio. what do ya think? should i keep it?



acontreras -> RE: BT Bf109E-4 (8/27/2006 2:25:08 PM)

After further study, I am convinced it's a paint scheme developped by Adolf himself to blind allied pilots (due to its sheer uglyness). Only 3 prototypes were built and soon thereafter destroyed, after the ground crews would mysteriously go insane. Another secret weapon of the 3rd Reich revealed!



tubig -> RE: BT Bf109E-4 (8/29/2006 2:35:22 AM)

quote:

ORIGINAL: acontreras

...(due to its sheer uglyness).



[:)] i agree!



tubig -> RE: BT Bf109E-4 (9/9/2006 1:51:37 PM)

starting adding blisters and covers today. the first up was the centerline covering on the bottom of the wing (don't really know what it covers). at first i was going to do this with balsa but then decided to do it in fiberglass with a foam plug because this covering looks like it was stamped from sheet metal and it has a small flange around the base where it attaches to the wing. fiberglass will allow me to incorporate the flange into the covering whereas a balsa piece would require filler to do the same with more work. after marking out the location on the wing including the area for the flange, the foam plug was tacked onto the wing.

pic 2-3: then it was shaped. after shaping, it was removed from the wing, monokote was laid down, and the plug re-tacked.

pic 4: i used 3 layers of 2oz. cloth and 1 layer of .6oz cloth with West Systems epoxy. i did have a little problem with the cloth bubbling at both ends which i thought would happen. that'll be fixed by trimming off the ends and using microballoons to make an end cap.



tubig -> RE: BT Bf109E-4 (9/9/2006 2:07:44 PM)

while the epoxy was drying i made some blisters. these blisters are for the wing attachment bolts. for these i used some machinable media from freeman supply. i've read from mags from our uk bretheren that model lab board works well for shaping items like this. so an internet search led me to Freeman Supply which has all sorts of goodies. not really knowing what i needed i ordered one of their sampler kits which has small samples of their boards (http://www.freemansupply.com/MachinableMediaSam.htm). for these blisters i used RenShape 5020 mostly because it's the lightest of the bunch. it's very easy to cut and hand sand. it's a little coarse (reminds me a little of the hard, green foam florists use to stick flower stems into, just not that course and a lot harder) so it'll need a coat of putty to fill in pin holes.

here's what i came up with after an hour's work including make the template. really very easy.



ramcfarland -> RE: BT Bf109E-4 (9/9/2006 5:39:24 PM)

tubig,been following your Messerschmidtt's build with great interest.A question:does the 'foam type'material resist say Red putty *nitrosand that most of us use[sm=confused.gif]And if not what technique do you use to make the 'carved and sanded' surface in a filled state ready for Monokote,which brings up another question with me at least..[8D]



saramos -> RE: BT Bf109E-4 (9/9/2006 6:23:32 PM)

Your progress looks great!
On my spit, for several pieces, I used florest foam. It's really a bit too soft. I glassed the pieces, then removed the foam, leaving a fiberglass shell. Looks like the foam you found will be a more stable material to work with. Perhaps it can be used for making plugs? I'll have to get a sample pack, looks like good material.

Scott



tubig -> RE: BT Bf109E-4 (9/10/2006 1:36:42 AM)

thanks guys.

scott, i think maybe i shouldn't have compared this stuff to the florist foam because it's not foam. the florist foam was just the closest thing i could think of to the tactile feel of this board. this is some sort of low density board but not sure what material it's made from. you can dent it with a fingernail if you push hard enough but it's certainly solid enough for our purposes. the other samples pieces were much denser and harder but they were heavier as well.

richard, i was also curious if putty would attack the board so i used some bondo putty/spot filler on a test piece with no problems.



tubig -> RE: BT Bf109E-4 (9/10/2006 1:24:18 PM)

the cannon blisters came today. first was marking the location. the outline shown in the photo is for the outermost flange of the sheet metal covering. the small projection at the bottom will be a cutout in the sheeting. this was the shell casing ejection chute on the prototype.

pic 2: then came two plugs made out of foam. once again clear monokote was laid down and the plugs tacked into place on the monokote (the tape is there only to hold the parts as the general adhesive type glue dries). if you can't tell, i really like the "lost foam" method of making fiberglass 'one off' parts.

pic 3-4: and again West Sytems epoxy and 2oz/.6oz cloth used.



tubig -> RE: BT Bf109E-4 (9/10/2006 1:40:04 PM)

while the epoxy was drying, i made some aileron hinge fairings out of balsa. after shaping on the wing, i strenghtened by soaking in ca and then re-sanding to smooth them out. then they were primed. while, technically speaking, the fairings should have continued on around to the leading of the hinge, i knew that that would present a problem when it came time to insert the hinge bolts so i elected to do them this way. very close, just not perfect.



Baldeagle -> RE: BT Bf109E-4 (9/10/2006 4:14:55 PM)

Tubig lot of good info you are showing. I hope to build a 109 next year. Thanks for sharing and I will stay tuned. Rich



tubig -> RE: BT Bf109E-4 (9/11/2006 5:29:59 AM)

thanks rich! i appreciate you looking in. which 109 are you think of? plans or kit? i really like the looks of the 109. very sinister and yet, at the same time, graceful with it's clean lines.



carlbecker -> RE: BT Bf109E-4 (9/11/2006 1:48:42 PM)

Tubig,
I have some West Systems epoxy. I have not used it yet but hoped it made a stiffer layup than finish epoxy. The wheel doors on my Zero are quite flexible using the finish epoxy though so far are holding up well. Is there a big difference in stiffness?

Carl

Keep up the great work. This is going to be a very nice aircraft. I wish I had your patience and skill.



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