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Blohm & Voss BV-138 Sea Dragon 1:8 scale

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Old 02-11-2014, 10:00 AM
  #51  
splinterz25
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Today I've spent the morning looking at the center section where the boom will attach
on the lower side of the wing there will be a part that looks like the boom and air/exhaust scoop.

So I'll be adding in some 1/8" 5 ply on each side of the front main spar that will make it 3/8" thick;
there will be a rectangle hole that a 1" x 1/2"x 9" piece of 9 ply will pass through, this will be the tongue that the 1/2" 9 ply fire wall will hook on to holding the front part of the boom.

Have a look it will help you to see where I'm going w/ this

There will be other lock/ pins & bolts w/ T-nuts also holding each boom this is the main front hold.
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Old 02-12-2014, 05:01 AM
  #52  
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Okay guys there is really no indication of how Gene intended to mount these booms to the wing here's my revised drawing; be aware I've since found a mistake on my part.

Where I show the fire wall on the one section w/ the wing panel I've put it out in front of the LE this is wrong the fire wall goes through the LE.

But this should help you to formulate a way to mount your booms and for our followers to understand what I'm building.

Today,

I've been thinking all last night and I going to make/ glue the boom section of the # 6 ribs together w/ formers but not to the main spars yet, this way I'll still be able to take it apart to work on various other parts flat on the bench.

Bruce
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Old 02-12-2014, 11:38 AM
  #53  
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she's a big FUEL airplane there's been a bunch of guys telling me it will be to heavy and I need really big engines; so this is what I did.

Alright I put the center section on the scale as it is w/ the ALUM wing tubes in
and a few clamps to hold it together and it only 6 lbs 2.5 oz and this is going
to be the heaviest part of the plane.

This is 1/8" LIGHT PLY AND THE MAIN SECTION THAT HOLDS THREE FUEL ENGINES.
That will have about 6 HP all together......This is not an ELECTRIC build!!

I know when you see that 1/2" 9 ply your thinking it's over kill;

But this is there because the BOOMS WILL BE REMOVABLE and they will have a
OS FS-91V HANGING ON THEM.

The center engine will most likely be a huge single four stroke or a V twin GLOW ENGINE.

I've posted some of the comments Gene made on the drawings about materials

I bet I'll keep it under 40lbs.

Bruce
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Old 02-13-2014, 10:16 AM
  #54  
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Okay I continue to make my custom parts for the boom & tongue / removable system while I'm doing this I'm making the second sides parts as well.
I've also made a few new oval templates for more lightning holes that will be cut in where I left them out; But first I'll need to glue in a few plates on the main spare.
These will sandwich the 1/4" 6 ply w/ two 1/8" aircraft grade 9 ply pieces and when I get the second side finished I'll take it all apart again and rout and drill a bunch more holes in the ply; now that I can see where it's needed and where it won't weaken the structure.

Have a look,
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Old 02-15-2014, 06:33 AM
  #55  
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Okay I'm going to be busy most of the day but I was up early and got a few more holes drilled and then put it all back together to check out everything.

I'll still have to take this section apart several more times before I'll have it to my liking.

You will have to look close to see most of the changes the large holes that aren't round were enlarged and small holes were drilled in where there was dead space.

Have a look,

Bruce
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Old 02-15-2014, 08:05 PM
  #56  
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Alright I pushed on this evening and dry mounted the center section to see what I had and how strong she would be.

IT'S VERY STRONG W/ OUT ANY GLUE.

It went right on no problems and I think it's great start for the booms to have a solid base to mount to; I think maybe now the guys that were telling me it should be balsa will see why it needs to be plywood.

I also took a few photos of the shoulder on the fuse to show Martin this area doesn't need to be covered w/ skin it's inside the fuse; and where the wing rest on that's why I didn't cut out very much on those shoulders.

I'm sure I'll do some more bracing where the wing mounts I'm just very happy it went as planned and dropped right on.

Check it out,

Bruce


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Old 02-16-2014, 06:03 AM
  #57  
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I was so happy that the center section went on so smooth yesterday I forgot to get a photo of her w/ the firewall boom mounts in place.

I really like the look of the laser engines and I'll have to see if I can get more info on them the site I have doesn't have there dimension and I don't know if you can get them in the USA?

But it's good to know that it's a reliable engine and I see they now have a 360v as well.

Here's a few photos w/ the fire wall in place,


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Old 02-16-2014, 12:29 PM
  #58  
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I've been cutting in the aft stringers and the hinge mounts for the flaps today in the
center wing section this required taking it all apart once again; I'll post photos when
I get her back together again.
Then it's on to making templates and parts for the booms.

Bruce
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Old 02-17-2014, 04:38 AM
  #59  
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Okay from what I've been hearing the Laser V engines are suppose to be very smooth and scale like and If I can get one that will fit the cowling this maybe the way I'll go for the center engine.

Well I've made most of the cuts on the aft ends of the ribs on the center sections for the flaps and the 1/2" x 1/4" spruce stringers over the weekend; I just need to notch the center ribs 1 & 2 for the stringers this morning.

I've been trying to come up w/ a way I make the TE; it comes to a very fine point and the flaps are very thin as well.
I'll probably leave it for now and get back to the flaps after the booms are made and mounted to the wing, because there in two pieces on each side splitting under the booms.
There's very little detail on these in any photos that I've obtained so I really do not know what they look like inside when deployed or what type of hinge the Germans used here?

Bruce
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Old 02-17-2014, 05:36 AM
  #60  
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Hi Bruce,
As usual fantastic craftsmanship. Definitely a unique subject. Leave it in is uncovered state and display it. Shame to cover up all that nice woodworking. LOL Beautiful work, keep plugging.
Thanks,
Fred Menna Check6
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Old 02-17-2014, 10:14 AM
  #61  
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Thank you Fred when I saw this plane I knew I had to build one and there won't be very many others w/ it
That's the think w/ this kind of wood work you end up covering it but this is why I take so many photos so if somebody else wants to build one they'll have a reference to look at.

I have nothing to go on but a few black and white photos and right now I need to see what the flaps look like inside when deployed and how the Germans hinged them.

thanks for checking in again,

Bruce

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Old 02-18-2014, 11:20 AM
  #62  
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You can see in the photo of the model that the split flap is a bit different in that it doesn't go all the way to the aft edge; there's a small boarder there.
I wish I had some internal photos of these to see the hinges as well.

Well I've made the cuts for the flaps and as I thought the aft part of ribs don't line
up perfect BUT this is no surprise

So I've been working on correcting this problem and also I marked out the LE

MYSELF I wasn't going to trust Genes lines here; there's a photo of the typical LE.

BUT if you look a some of the photos of the LE on my templates that I didn't cut YET. there all different. I'm not sure I need the 1/4" x 1/4" spruce stringer here and

I have no idea why he put the 1/8" strip in there?

My thought is to sheet the ribs up to an over sized 1/2" tapered edge then shape it to the correct profile.

This is a lot easier to do and I don't think I need the extra weight or strength of the 1/4" x 1/4" spruce stringer here? anybody have thoughts on this am I missing something? or is this just an old school way to build the LE.

This will slow down the progress but needs to be done before I move on to the BOOMS and I've been thinking I'll have to glue the center section also before moving on; There's to much movement otherwise, and that could cause serious issues later on during the build.

So have a look and I'm open to any ideas you guys may have here.

Bruce
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Old 02-19-2014, 11:02 AM
  #63  
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Okay I had realized that there was another part I need to make for the aft side on this center section; and that was a sub structure where the bolt that holds the boom on will pass through the wing.

The T-nut will be mounted in side the boom; and I've left my self enough room here in case I think I need two bolts at a later time.

There will be a inlay of 1/8" 9 ply that will get countersunk for the bolt head to mount flush w/ the bottom of the wing; this will be added at the same time the skin is being put on, this will most likely be a 1" circle glued to this sub piece of 1/8" light ply in the photos I'm posting.

The cross pieces of 1/8" 9 ply is there for extra strength the 5/16" x 1/2" balsa piece is no where strong enough w/ out the ply being glued behind it.

The balsa is for the hing mount only and as you can see in the drawings both flaps stop on each side of the booms here.

Gene has a flap / tab that carries over from the outer wing tip; But I don't like this because it will get beat up or ripped off while in the hanger.

I need to come up w/ something different so I'll be thinking on this one.

It's slow going but this is what scratch building is about; I made the other sides parts as well and will copy them on to ply for a templates for the short kits parts.

Have a look,

Bruce
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Old 02-19-2014, 12:02 PM
  #64  
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Hi Bruce,

I've been lurking and following your progress. Great work !!

You can get the Laser Engines here http://www.proctor-enterprises.com/p...aser/laser.htm

They are great to work with and Lasers are very smooth. I have a 300v that lives down at CHIgnition currently as Adrian is exploring a gas conversion for me.

As far as the dimensions you can still get them from their old site which is still up while they update the new site. The new site went live this year and is still being filled out.

http://www.laserengines.co.uk/engines.htm#300

Click on the photos and the new page shows the dimensions you need.

Keep up the great work!!

Joe

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Old 02-19-2014, 12:33 PM
  #65  
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Thanks Joe I've been looking at there dims. and I don't think a V will fit but the laser 180 may there's only
4" of width in the cowling but it's 7" long but what I can't find w/ these engines is the HP out put or there
POUNDS of THRUST ???
IF THE 180 HAS 3- 3.5 HP IT MAYBE WHAT I'M LOOKING FOR.

Bruce
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Old 02-19-2014, 05:47 PM
  #66  
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I already have $650 worth the engines and will most likely spend another $650 or better for the BIG center engine.

I have gotten the whole center section clamped up on my cradle / jig and I'm heading back down to start to glue the top half.

I'll use med CA w/ a thin tip and be very careful not to glue it to the jig this way I'll be able to invert the center section.

On to my reconfigured jig this will hold it while I mount the booms.

The aft section wasn't as bad as I first thought and I'll cut the flat sections off the the wing rib tips while it's together then sand it to my lines getting the angle just right.

Bruce
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Old 02-20-2014, 08:40 AM
  #67  
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Okay last night all I was able to complete was tack gluing the ribs w/ MED CA glue.
This morning I started gluing on the top of the I beams/ stringers w/ the center section still in the jig/ cradle then once that was dry I flipped the whole thing over and glued the top side.

This part is solid as a rock and needs to be because it holds all three engines.
There's a few spots where I'll need to do some sanding but there is only 12" of exposed wing panel on each side; the rest is booms and nacelles.

Have a look at the days progress,

Bruce
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Old 02-20-2014, 01:32 PM
  #68  
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Well I was just cleaning up my shop and I've been planning on hanging the Stenson SR-9 up above the old fire place that DOESN'T ever get used any more to free up a big space.

And Martin said (the guy that gave me the plans) if was to take it upstairs to the build room I wouldn't be able to get it out through the door but it's only 22" -24" tall the door is 29" wide. The Wing Span well that will just fit up there wall to wall.

But she's a BIG ONE for sure wait until the booms go on then you'll really see her size.

I got it all glued and unclamped; then set the center section back on the fuse this time I have to cut in two 1/8" notches into the aft stringers that end into the fuse former.

But after cleaning the shop I'm done for the day

Bruce
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Old 02-21-2014, 11:49 AM
  #69  
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Okay as I normally do when I make a mistake I show it so the next guy can avoid doing the same.

The top aft stringer is suppose to go in front of the former #13 when the center section is in place.

When I dry fit the section it made the top of the former bend forward and since I notched the bottom stringer I though I need to cut t through the center of the top stringer. WRONG!! ALL I NEED TO DO was to sand a angle on the lead edge.

But it was to late I cut through SO to make a come back I've added a larger piece to fill the gap and will glue it at the proper angle.

I've stepped back from that for the moment and went on to the boom formers templates.
And while I cut out those I've desited to make the formers 1/4" home made laied up balsa ply; to do this Iv'e cut the 4" x 36" sheets on an angle (diamond shape)

This will allow me to run the grain of the wood cross ways creating a much stronger piece of 1/4" balsa; I glue them together w/ white gorilla glue and press them w/ calls and clamps.

Well a little bit of a set back but not the end of the world, the whole thing is very strong.

Bruce
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Old 02-21-2014, 02:42 PM
  #70  
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Okay I don't think I was very clear about the balsa ply I'm making so there's a few more photos of that; it has been setting for 2 hrs. so I took off all clamps and pulled away all the wax paper w/ the dripped glue it was still wet then wipe down the edges getting off as much wet glue as I could then NEW wax paper between them again and back into the clamp press for the rest of the night. I do this because it's easier to deal w/ once it's all cured.

ALSO I know there's been a few guys wondering about the removable booms SO I did a mock up w/ the templates to show and to see myself how it going to line up.

And it's looking about like I planned I need to adjust the firewall a bit the 1/8" light ply wing crutches need lightning holes drilled in them; but you should get a general idea of where I'm going with this now.

THERE WILL BE MORE TO HOW IT LOCKS ON / DOWN !
But the 3/4" 9 ply tongue in the bow and the 3/16 or 1/4 20 bolt going into the
T-nut at the aft of wing will be the main holds; I'll add dowels or clips in a few places also.

Have a look,

Bruce
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Old 02-22-2014, 12:11 PM
  #71  
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ALRIGHT I'm going to make this clearer it seems like folks don't see where I'm going w/ these removable booms.

IT'S still in the DEVELOPMENT STAGE...From my experience in the past I've learned you can only do so much w/ drawings you need the 3-D view and actual pieces parts to work with when there's this many angles and curves involved.

So I'm using the former templates until I know just where I'll make changes; I drew then w/ there lower haves but have removed them from the forward formers.

The reason for this is because there not needed because of the wing how ever some will be used for the lower stringers to have a place to end up inside of the wing for strength.

I've gotten the front figured out better by swapping the two 1/8" ply mounts / holds I made earlier and filing out the hole where the tongue passes through the fire wall at a slight angle.

So far it's going as I planned but there will still be more added; this is a better mock up this time w/ the wing crutches now drilled and temp attached to the SHORT stringers the real 6' stringers will be added latter on.

My lam balsa ply I made came out nice and I be altering some of this by adding 1/32" 9 ply for some of the formers where the tail will break and in the front where the former will have a lip added to lock in in.

Here's where I'm at so far, take a look and feel free to ask questions I know I've lost some of you on this part.

Bruce
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Old 02-22-2014, 07:57 PM
  #72  
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OKAY I thought I had better check out where the engine mounting bolts will end up going through this seemed like a important thing to check before moving onany farther.

Someone said early on when I cut out mt firewalls that they seemed WAY TO HEAVY to THICK of plywood for a model

Well take a look at the engine w/ the mounts just clamped up This engine just fits this firewall w/ a little room to spare; I don't know how much bigger engine I'll be able to fit in the center section.

There's more room in the length but not the width; the real issue is getting the
center line of the prop w/ out the mounts being to close to the top.
I'll have to do some good measuring before buying the center engine.

On one of the balsa ply sheets I made I glued a 1/32" aircraft ply face to it.

SO RIGHT NOW IT'S 9/32" THICK I'll trim strips down to 1/4" these will make up the really small formers at the aft of the boom, these will have carbon fiber tubes running through them.

The ply will be on the out side where the boom and tail will come together. You'll see this later I'm just making all the parts now.

check it out,

Bruce
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Old 02-23-2014, 04:23 PM
  #73  
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I finished shaping and sanding the templates today and have come up w/ a plan for the front mount of the boom to the wing.

Then I lay out the balsa / ply to be cut and routed and I should be able to dry assemble one or maybe both booms tomorrow.

Then I'll be able to work on the aft end mount w/ T-nut or nuts?

After that it's on the the removable tail section w/ carbon fiber tubes and a rotary drive system for the ELV I'm still not sure how I'll tackle the RUDDERS?

I'll show some photos tomorrow; oh yea I fixed my camera I don't know if you've noticed the quality hasn't been as good lately?

It had a week battery and I was fighting it all the time to shoot photos.

Bruce
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Old 02-24-2014, 09:47 AM
  #74  
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Okay I cut out the balsa ply and I made the booms formers w/ my router, band saw, and drum sanders then gave them a test fit; there needs to be some tweeking but she starting to look like the BV-138.
I made formers 8 & 9 out of 1/8" thick balsa I may change this there week;
The others are very strong.

I've put the bottom stringers on now w/ a few more formers to see how to go about the aft hold down.

The front will have two 3/16" oak dowels going from holes the main stringer through my forward mount where they will be glued and stick into the fire wall 1/4"-3/8" these will lock the front end in tight and keep it from twisting.

SO it will have the 1/2" x 1" 9 ply tongue and two 3/16" dowels holding the fire wall.

I'm taking a break then going to look at the aft hold down T-nuts and bottom stringers mounts.

There are photos showing how I made these parts and them dry fit; I'm still working on it but it moving along now.

Bruce
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Old 02-24-2014, 01:17 PM
  #75  
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This afternoon I lay out some parts for the aft boom mount I'm changing what I had from lite ply to aircraft grade 9 ply and I'm also adding a few pieces I'll cut and work on this tomorrow.

I also made alterations to the front two formers so my 12 oz.Sullivan round fuel tanks will fit snug behind the firewall.

OS recommends 300 cc tanks 10 oz for the FS95V but I'm giving it a little bit more.

They fit like there suppose to go there; the center engine will need a bigger tank and there's more room there for a larger tank.

Check it,

Bruce
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