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**bwi 971** · 06-24-2016, 02:54 PM

Propeller finishing diameter 40mm (1.6").

2 blades of the prop were slightly off regarding the diameter....It was starring at me every time I looked at the propeller.......so I needed to address.
The problem is You can't heat 2 blades without melting the solder of all the others.
I took a piece of pipe turned the inner diameter to the required diameter of the propeller 40 mm in my case.
Made a support for the blade roots, mounted the propeller on the jig with the root support, put the pipe over the propeller, filled the casing with sand halve way the propeller height, wetted the sand with water and heated everything up. When everything was hot enough I adjusted the blades till they touched the pipe casing and let everything cool down again. Put the propeller on the lath, turned the lath on, and I saw a perfect propeller NO MORE STARING.

While I was doing that I thought lets finish this thing........I saw on some pictures that sometimes the propeller of the AKULA's is provided with zinc anodes.....I casted some anodes with use of solder, they are approxiatly 1.5mm in diameter, and glude them on the hub.
Now the propeller can go into the finished box.

This pic showing the prop of a KILO class I used it as an example for the anodes.

Grtz,
Bart

**He Who Shall Not Be Named** · 06-24-2016, 04:04 PM

A great job on that propeller blade assembly jig. Loved the use of wet sand as a support grout -- I'll steal that. Yet another reason to hate you European types!

M

**He Who Shall Not Be Named** · 06-24-2016, 04:22 PM

ERROR: The request could not be satisfied

http://s262.photobucket.com/user/dmeriman/slideshow/propellers

Variation on a theme

**bwi 971** · 06-24-2016, 05:19 PM

Yeah.....it was in 1997 when I first read your cabal reports making a pumpjet..........still remember thinking how on earth will I ever be capable of making one of those........and after 20 years I'm still pondering on it.
I remember you made it out of renshape......your casted that stuff into blocks (cubes) yourself in those days no?

Grtz
Bart

**He Who Shall Not Be Named** · 06-24-2016, 07:35 PM

I was casting blocks (blanks) of polyurethane resin and foam. The blanks then became filler blocks or substrate for carving and/or machining. Now I just go with the commercial product, RenShape. Loren Perry was the guy who taught me how to secure propeller blades to the hub as the entirety was brought up to heat for soldering.

Super Sculpy is another good choice of material to hold the blades in proper alignment during the soldering process.
M

**bwi 971** · 06-28-2016, 03:41 PM

Almost finished eyeballing my lathe true the magnifier lamp......only the five protectors left.
I have marked the tamps with red to distinguish them from the spikes with the naked eye.

Grtz,
Bart

**trout** · 06-28-2016, 05:42 PM

WOW, that is crazy good. It will add nicely to your sub, although I wonder how many will truly appreciate what you did. As a side thought. Those will pierce nicely any surface target giving you a hard time.

**bwi 971** · 06-29-2016, 01:08 AM

Originally posted by trout

I wonder how many will truly appreciate what you did. As a side thought.

Thks Tom.......I don't mind that.......I know it is there.......I consider this sub as an test platform, to see what I'm capable off, to find out how I can do things effectively.......what works and what doesn't.

For me the building is the fun part of the hobby......I want to do come as close to the real thing as possible. this of course is limited by:

the available information I can lay my hands on
the way I want to work (I like old school)
my skills
the level of compromises I want to make

Originally posted by trout

Those will pierce nicely any surface target giving you a hard time.

If anyone gives me a hard time I will give them a nice finger wave and I will use the AKULA for it.

Grtz,
bart

**HardRock** · 06-29-2016, 03:15 AM

Hummm.... speak softley and carry a big, pointy Akula!

**bwi 971** · 06-29-2016, 08:35 AM

ROFLMAO

grtz,
Bart

**bwi 971** · 08-03-2016, 05:03 PM

Rainy day's , finally I had an excuse to spent some time in the cave to do some modeling work.

I received some brass sheeting of 0.15mm (0.006�) thick. It is more suitable for stencil making especially for the scribing stencils of the sail then the 0.35 I used before (more flex).
The brass stencils are a copy of the styrene test stencils I made previous.

Next up were the different air vents gratings. Round ones (2 pc) will be used on the towed array pod, the rectangular ones (15 pc) will be used on the upper hull. I don�t have equipment to etch so I used a 0,4 mm drill to fabricate them. I used the 0.15mm brass as material.
I made 20 rectangular and 4 round ones, I will use the best out the pack to apply on the model, Yes I�m insane.

I cut out all vent holes in the upper hull, to take the gratings. They were scribed but never the less I used two of the out casted gratings for dimensioning testing. Squeezed two of them in tweezers one for controlling the width and one for the height.

Rudder and planes. I think I got caught by resin shrinkage. I did put a lot of effort to get the gap between, the control surface and the rudder and plane structure as narrow as possible. After the casting however I noticed that the cap was bigger than the masters. I couldn�t leave it like this (yes I tried to ignore it but I failed) so I rectified it with some EUREKA putty.

That's it for now, Grtz, Bart