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Old Oct 30, 2013, 01:54 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
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Build Log
Blohm & Voss BV-138 Sea Dragon 1:8 scale

Okay this is the BLOHM & VOSS SEEDRACHE' ( SEA DRAGON)
By Gene Falada redesigned by Splinetrz25.

BV 138C-1/U1 Seedrache

The Blohm und Voss BV 138 was officially named 'Seedrache' (Sea Dragon) but unofficially it was instead mostly called 'the flying clog'. It was built and used as a long-range maritime reconnaissance flying boat - often flying for hours far out over the sea in search of allied convoys and shipping. Fully loaded it could fly over 4000 kilometers and stay up for 16 hours. This range could be increased even further when using RATO packs (Rocket Assisted Take-offs) or when launched from catapults on board seaplane tenders.

The BV 138C-1 was powered by three Junkers Jumo 205D-1 diesel engines and although they were fuel efficient they made the aircraft very slow and gave it a maximum ceiling of only 5000 m (16400 ft). However, armed with 20mm cannons in two turrets and a 13mm heavy machinegun in an open position as well as an optional MG15 the BV 138 could often take care of itself when attacked. It has for example been known to shoot down a British Blenheim as well as a Catalina flying boat in air-to-air combat. And since the BV 138 could also take a lot of battle damage and keep flying, especially as the diesel fuel rarely ignited when hit by machine gun fire, she was generally well liked by her crews.

Although the BV 138 was able to carry small loads of bombs and depth-charges and thereby do attack missions such as sub-hunting, most operations were pure reconnaissance and surveillance, often working together with the German U-boats. But they were also used for convoy escort, air-sea rescue, personnel and equipment transport or as a few modified ones for mine-sweeping duties.

The BV 138 flying boats were used almost all over Europe and patrolled the North Sea, Skagerrack and Kattegatt, Baltic Sea, Arctic Ocean, Norwegian Sea, Bay of Biscay as well as the Black Sea and the Mediterranean.

Major Production Models
Bv 138A-1 First production version. Service entry in April 1940, 25 built.
Bv 138B-1 Reinforced hull and floats, improved engines and armament. Service entry in Dec 1940, 24 built.
Bv 138C-1 Structural strengthening and improved armament. Service entry in March 1941, 227 built.

Other variants and modifications:
A few Bv 138C-1s were equipped with a large electric degaussing ring and used for minesweeping. Designated Bv 138MS.
Small numbers of Bv 138s were utilized as personnel transports whereby ten fully equipped infantry troops could be carried which actually required no modification of the plane. Luftwaffe's famous special-operations unit, KG 200, used for example one with this purpose.

Most if not all Bv 138s were equipped with catapult points for operation from seaplane tenders and about 20 Bv 138C-1s were equipped with a modified fuel filter to remove possible pollutants when refueling from u-boats. Some C-1s were also equipped with the FuG 200 Hohentwiel or FuG 213 Lichtenstein S radar to easier search out enemy ships and attack submarines.

Of the 227 Bv 138C-1s built, 164 were equipped with two racks for bombs and thereby doubling the offensive payload of the earlier built aircrafts. These later versions were designated Bv 138C-1/U1 although they were mostly still just called Bv 138C-1. Also some Bv 138B-1s are believed to have been modified into U1 versions.

Performance
Max speed 285-300 km/h (177-186 mph)
Ceiling 5000 m (16400 ft)
Range 4000 km (2500 miles)

Dimensions
Wingspan 26.936 m
Length 19.850 m
Height 5.900 m

Crew
5-6 members; Pilot, Navigator, Radio operator, Nose gunner, Rear gunner, Upper rear gunner.

Armament BV 138C-1
1x MG151 20mm cannon in bow turret
1x MG151 20mm cannon in stern turret
1x MG131 13mm machine gun in open position aftward central engine
(optional) 1x MG15 7.9mm machine gun through hatch in starboard side of hull

(Early version) 3x 50kg (110 lbs) bombs on racks beneath starboard wing centre section or
2x 150kg depth charges
(U1 version) 6x 50kg (110 lbs) bombs or
4x 150kg depth charges

This will be a long build and I may end up making a hand cut short kit and glass parts & vac-formed parts if all goes well.

Bruce
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Old Oct 30, 2013, 02:52 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
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These plans were given to me by a friend who had bought them many years ago and when he heard me mention I was looking for plans for the BV-138 he had a copy made for me he'll be building one also as soon as he gets finished w/ his
DC-3 but I bet he starts sooner than that.

I'll be making changes to the design and making templates as I go it will have removable wing tips & booms and the ELV,STAB will also be removable.

The first thing I changed was how the booms were being made Gene had a
1/4"x 1/4' balsa box frame and balsa formers top & bottom I'm making them all one piece 3/16" thick light ply w/ spruce stringers. This was done because of everything being removable it has to be very strong.
He had called for 1/8" mohogany door skins down the sides of the balsa boxes; but since I've beefed up the frame work I'll skin w/ 1/8 balsa everywhere.

The 3 engines will be Glow fuel OS FS 95-V's.

I've built a scale static display model from Supper Models it gives me a good reference because there's not much in the way of info on this bird out there.

I've found one site on the web there are none intact left in the world just one rusty part of the hull in a museum in Holland.

Here's what I've looked at how the engines will fit and redrawn so far.

Bruce
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Old Oct 30, 2013, 03:25 PM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
13,639 Posts
This is probably one of the best shot videos I have seen --

BV-138 Air-to-Air FPV Video - Making-Of (4 min 58 sec)
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Old Oct 30, 2013, 03:37 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
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I've seen this video and it's great he did a fantastic job on the build I hope mines half as good
but mine will be glow fuel. 3 OS FS 95-V four strokes.
Thanks for posting it eflightray
Bruce
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Old Oct 30, 2013, 06:19 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
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Well I knew this was a giant scale plane but it's going to take a lumber yard full of wood to build this one HOLLY
The (boat) center section is about 4' wide & over 6' long 22" tall!
the center wing ribs are just over 24"

IT'S A BIGGEN TO SAY THE LEAST

Bruce
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Old Oct 31, 2013, 06:25 AM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
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Here's some photos of the BV-138 there aren't very many.
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Old Oct 31, 2013, 09:06 AM
Parkcityflier
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Park City, UT, USA
Joined Aug 2001
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Bruce, you're a busy guy. Still in the middle of a complex project like the PBY and already making preparations for the next. The Sea Dragon looks like it will be a great one to do. It's just a shame that there isn't at least one left somewhere.

Jim
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Old Oct 31, 2013, 07:40 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
4,465 Posts
Quote:
Originally Posted by parkcityskier View Post
Bruce, you're a busy guy. Still in the middle of a complex project like the PBY and already making preparations for the next. The Sea Dragon looks like it will be a great one to do. It's just a shame that there isn't at least one left somewhere.

Jim
Thanks Jim the PBY's winding down as far as building goes there's some details yet to do but remember I said this was a fun build I'm not going all out w/ details on this one the float retracts were something I added they were suppose to be simple, She won't be a plane Jane though.

Went to the store to get supplies today and came back w/ 10 table saw with the amount of plywood need on this build and ripping stringers it was time for one.

I like staying busy it keeps me out of trouble,

Bruce
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Old Nov 01, 2013, 01:15 PM
# Scale is a way of life
scale_only's Avatar
United States, CA, Orange
Joined Apr 2010
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Quote:
Originally Posted by eflightray View Post
this is probably one of the best shot videos i have seen --

[url="http://www.youtube.com/watch?v=yntuym9syng"]http://www.youtube.com/watch?v=yntuym9syng[]
***like***
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Old Nov 01, 2013, 05:09 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
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I thought you might like this build.

Bruce
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Old Nov 02, 2013, 10:36 AM
# Scale is a way of life
scale_only's Avatar
United States, CA, Orange
Joined Apr 2010
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I do,, that's a bad ass airframe, the thought of 3 inverted 4 strokes sinking up is daunting though,,,
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Old Nov 02, 2013, 08:20 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
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Quote:
Originally Posted by scale_only View Post
I do,, that's a bad ass airframe, the thought of 3 inverted 4 strokes sinking up is daunting though,,,
It should be a real cool build and making the templates for a short kit, molds, Vacu-formed plugs & parts and maybe cockpit & gun turret kits is going to take some time.

Bruce
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Old Nov 04, 2013, 06:20 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
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I continue gathering materials tools and doing lay out and drawing changes; I have enough 1/8" Baltic birch for the formers & ribs and just got a sheet of 3/16 birch ply for some of the areas I want to beef up.

I also got a sheet of 1/8" Masonite to make templates out of and because the fuse will be built w/ full formers I bought a sheet 3/4" maple ply to make the 6 foot building jig.

The Fuse (Boat) will rest on the stringers suspended in air while the top is built then flipped to skin the hull.

I should have something to show in a day or so I have a lot going on building the PBY setting up the shop and this build.

Bruce
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Old Nov 06, 2013, 01:01 AM
I just love flying
MattZC's Avatar
Traverse City ,MI
Joined Dec 2005
909 Posts
Checking in! I have Bruno Shmalzgruber's plans for the BV-138, which is 1/9th scale. Not quite as big.

Hopefully I'll build one someday.

Good Luck,
Matt

BV 138 Impressionen (HD) (4 min 18 sec)
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Old Nov 06, 2013, 04:26 PM
Jack of all master of none
splinterz25's Avatar
Baltimore MD USA
Joined Jan 2011
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Thanks Matt I hope mine will look half as good and get out of the water.

Alright I just ordered my wing tubes from TNT after talking w/ Tom; I bumped the size up to 1 1/2" x 30" for the two front tubes and the two aft tubes will be 7/8" x 18" both will have phenolic sockets $116 total to my door. and this is just the beginning.

I'm still drawing and checking over as much I can think of, once I cut templates and do a dry fit of all pieces that will tell everything.

Then adjustments will be made if needed or new templates made; then maybe I'll cut some 1/8" ply parts?

And I still need to make the jig to hold this big baby true while building the top half.

Long way to go yet,

Bruce
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