Stealth submarine ssgn harpoon-04 video

[cliffhanger67]

Here's the link:
http://youtu.be/GwwRBq_3ESO or https://www.youtube.com/watch?v=GwwRBq_3ES0

I tried it but it says video not available. I do not know why. Alternately,
just go to You Tube and search for "SSGN Harpoon-04" it should come out.
This hull was designed and built from scratch. Home made. Many improvised parts and techniques. The boat is 41 1/2" long.

[redboat219]

Saludo ako sa yo sir!

That's a nice looking boat.
Looks like a modernized Hunley.

Can you show the stern plane controls?

[Scott T]

Nice job Cliffhanger. How long did you work on this from start to water/now?

Scott T

[cliffhanger67]

yes. I will post picture. basically, the stern diving planes are on each's shaft, linked by a u shaped crank. the servo push rod is on a hole just above the pivot holes.

[cliffhanger67]

It's been about 2 years. What took too long was waiting for parts, returning wrong or non working parts, and debugging. It took me 4 hull iterations before I settled on two versions, which are the 2nd and 4th versions. The RECABS Diving system alone took me 6 months to get fine tuned.

[cliffhanger67]

Aft diving planes system

The crank is aluminum sheet metal bent into a u shape. on this version, the servo rod is attached below the pivot axis. the shafts are brass tubes with studs glued at the inboard ends to use a pair of nuts to cinch the crank.

[redboat219]

Your hull, hand carved wood?

[cliffhanger67]

It is constructed with frame and skin epoxy bonded to it. Carving it would be very hard task to achieve the hull uniform wall thickness of 1/32 AND DIMENSIONAL STABILITY . Based on my general shape idea, I studied the bending limit of the skin material. Knowing this, I finalized the shape of the hull and the frame design. The front and aft ends are the areas of challenge/concern. Severe bending/twisting also caused the finished hull dimensionally unstable. In spite of the waterproof epoxy, reinforcing spars with metal joint stiffeners, repeated water exposure and drying caused the frame to twist. So the key is to understand how far to stress the skin so that you get the shape as close to your desired and yet has dimensional stability. I tried many techniques to overcome but in the end the right stress to my particular frame design was the solution. At the high stress sections I could not avoid, I had to notch the skin to bend it. Then blend the crease. The skin is a 6 layer Ash plywood 1/32" thick. The frame is cut from 1/4" thick red oak solid wood. Making the hand made hull took about 80 man hours but I think there is a learning curve that can reduce it. My last of the 4 hulls took much less.
What are you working on?

[redboat219]

Ever tried using styrene sheets instead of wood?

Been working on a Trumpter Kilo for the last 5 years, on and off due to work and family.

[cliffhanger67]

nope. I decided on wood because of buoyancy, stiffness to weight ratio, ease of getting it, and my equipment and experience. my hull is so stiff that it hardly deforms when pinched across the beam.

[Kazzer]

The RECABS Diving system alone took me 6 months to get fine tuned.

That'll larn ya! ;-)