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**crazygary** · 01-03-2014, 12:38 PM

Great build going on here, gentlemen!! Thanks much!

Also, ya gotta have provisions on board!
Never know when ya might get stuck in 10' thick ice at the bottom of the world!!
( A miscue at the hands of Al Gore and global warming?? ) Hah!!

**greenman407** · 01-10-2014, 07:54 PM

For a week or so Ive been down with the flu. Its amazing how a Virus can change your mindset and the things you like to do. For this whole week, I couldnt have cared less about this submarine. I was miserable............Im not miserable anymore and I seek resolution to this waterline thing. With all this testing and moving foam and weight and re-floating...........Ive come to the conclusion that I was right all along.
You cant change the laws of Physics. You set your Submerged trim First. Once that is good and proper your surfaced trim............. "is what it is". With one notable exception. You can at times insert additional foam above the waterline if you have room for it to delay a slowly sinking stern for instance. Because its high above the waterline, it doesnt change your surface trim.
In this boat Ive already got the above waterline space filled with foam, there isnt room for any more in the stern where the problem exists. It
floats perfect. When you submerge, the stern drops like a brick. The only solution is to install foam to displace the weight of the water thats coming in in the stern. If you could put the foam at the waterline you could help the matter but since the foam at the waterline is already full, you have to put it below that. Which then causes it to sit higher in the water that you want to.
You could try moving the Subdriver but then there a far worse consequences for doing that....a Unstable submarine. So as she stands She sits a little low in the front but goes down flat and even.

**HvyCGN9** · 01-14-2014, 07:18 AM

G'day Mate,

I was re reading your build and had an idea for your battery moving dramas.....ditch the foam and make up a cradle out of styrene (Plasticard) to hold battery in fixed position, that way you retain the air volume with minimal loss.

Cheers Bruce

**greenman407** · 01-15-2014, 09:21 PM

Thanks Bruce. Yep, I read you there. Already done. Also, the trim is completed.
Next up, I ,as Ive said before, dont care for the way my sail planes are working. Too much delay to control inputs and lack of general control due to flexing of servo pushrod. Solution? Home made bellcrank assm. Already installed and ready for fine tuning tomorrow. Ill get some pictures up tomorrow. Wont be long now. Ill take it out and see if I can sink it....er....sail it.

**He Who Shall Not Be Named** · 01-15-2014, 10:30 PM

Hurumph!!!!!!

**greenman407** · 01-16-2014, 11:46 AM

well Dave, the bellcrank is your idea anyway. I first saw it on your Gato......dude.

**greenman407** · 01-16-2014, 04:34 PM

OK, I am happy to announce that all is well with the Scampy. The Bellcrank mech. is a success. Since the bellcrank hit some of the foam installed under the upper hull in the rear, I had to cut a groove in the foam. Ill need to refloat it to see where, if any, ill need to put a little more foam back.
Just a side note. The foam that comes with the "Foam and Weight " kit appears to be of the open cell type. Which means that if you cut into it, you open up those cells in that area. Which means that it will absorb water at that point. Make sure that you put a thin layer of silicone seal over those affected areas.
The following pictures are the final state of weight and foam placement, just in case someone with limited experience would like a starting point. The first two are the rails to hold the battery from shifting around.

**greenman407** · 01-16-2014, 04:48 PM

The next ones are of the bellcrank assm. The picture you see of the vertical arm , well, it had to be cut down a little more as it was hitting under the hull, not allowing it to go down all the way for attachment. I took it off and used the Dremel to shave it down some what. After some fine tuning and servo reversal, I now have a much more positive command of the sail planes.
I will give a full report of the Scamps performance with and without the use of the sail planes.

**trout** · 01-16-2014, 04:56 PM

Kudos to you! I like the battery holder. It is a pain in the tuckus when the battery shifts and you sail at an angle. Good solution. Then the cam, very creative!
Can't wait to see her sail.

**greenman407** · 01-16-2014, 06:04 PM

Thanks. Obviously the purpose of the bellcrank is to eliminate the bending forces on the pushrod exiting the Subdriver. This way, those forces are taken up by the central post that the vertical arm pivots on. I CAed it to the back of the motor bulkhead. Knowing this I soldered on a foot plate so that there would be a greater footprint for attachment purposes. The only disadvantage that I can think of is that when you need to pull the motor bulkhead off the Subdriver, youll need to remove the upper magnetic connection rod. Best that I put some kinda mark on it for easy reattachment and alignment. Also, Ill put some kinda indexing mark on the motor bulkhead for radial alignment.

**greenman407** · 01-16-2014, 06:39 PM

Tom, you mentioned a while back that you had trouble understanding my ramblings about the float valve. Well.................I have trouble understanding me, so therefore it only makes sence that others would have the same problem. Its a good thing that I go back and edit my stuff, otherwise I would completely confuse myself the next time I would read it...............seriously.