Revell U99 - Page 2 - RC Groups
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Apr 28, 2013, 12:53 PM
Is life for real?
pkboo's Avatar


Not all issues are solved but she running just dandy Here's a vid
Sailing Sub U99 (2 min 12 sec)
that hasn't come out quite how I intended it to come out Boo
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Jun 10, 2013, 06:36 PM
I see all your typos
Harquebus's Avatar
I really like what you've done here. Fine work. Do you have any partitions or bulkheads inside the sub hull or is it one big open space? Was also wondering if your props are counter-rotating.

I think that with the earlier conversion I had seen about 20 years ago, the builder had it so the main deck was almost awash when in the water; the water was higher than the scale waterline. Then with minimal forward speed, he would put the dive planes down and it would submerge. He had only a slight positive buoyancy to make diving easier. He could also maintain depth with only 1/3 throttle setting.

In other words, I think you need more ballast.
Jun 11, 2013, 01:08 AM
Is life for real?
pkboo's Avatar
Hi Harquebus, thanks! No, no bulkheads, its all open space inside. The props are not counter rotating, the motor is geared and turns both props in the same direction. I do agree, to make it dive I have to add ballast. That can be done, however it's also not watertight so diving might be a no return thing Boo
Jul 08, 2014, 11:28 PM
I see all your typos
Harquebus's Avatar
I just had to revisit this thread about a low budget "submarine" or the poor man's alternative to the 1/72 VII-C.

The conversion I spoke of was operated with three channels (throttle, rudder and forward dive planes). 2 bulkheads separated the battery and motor compartment from the 'problem' areas or those most likely to leak. So a bulkhead sectioned off the bow area which had the forward dives planes on a horizontal shaft that could leak (and did, just several drops per excursion) and a rear bulkhead that sealed off the rudder and propeller shafts. The rudder linkage and the motor shaft penetrated the aft bulkhead through a tight and greased shaft into the center compartment. I'm going to have to do one of these one day---a great wet weather boat whether diving or running on the surface.

pkboo: did you seal your sub at all? I don't see how you keep the water out and still have access for charging. I failed to see if you had a servo connected to your stern dive planes.

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