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Old Sep 22, 2013, 01:13 PM
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A "Flying" Sub (just not in air)

Although my primary area of interest is RC planes, I thought the folks in the Submarine forum might find this interesting (and perhaps some of you can tell me more about this kind of sub?)

This Underwater Airplane Flies Through The Ocean Unlike Any Submarine Before It

I am not into model submarines (I'll admire them all day long, but I don't like them enough to build one), but I'm always interested in technology and I am amazed that it took so long for someone to figure out that you could build a submarine that relies on hydrodynamic lift to enable it to submerge, rather on static buoyancy.

Are there any model submarines that use hydrodynamic forces to remain submerged, or is it exceedingly challenging (or excruciatingly boring) to build a hydrodynamic submersible with the right characteristics?
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Old Sep 22, 2013, 04:38 PM
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Known as a dynamic diver, as opposed to a static diver; the dynamic diver uses motion to dive whereas the static can submerge in place without forward motion.

The model sub in the video is a positively buoyant dynamic diver.

http://home.comcast.net/~max0007/bs.wmv

Additional info

http://groups.yahoo.com/group/Jetnautilus/
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Old Sep 22, 2013, 06:19 PM
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Originally Posted by Carcharadon View Post
Known as a dynamic diver, as opposed to a static diver; the dynamic diver uses motion to dive whereas the static can submerge in place without forward motion.

The model sub in the video is a positively buoyant dynamic diver.

http://home.comcast.net/~max0007/bs.wmv

Additional info

http://groups.yahoo.com/group/Jetnautilus/
Thanks!
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Old Sep 23, 2013, 11:55 AM
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Don't believe the hype. Dynamic divers have been around since the very earilest days of submarines. A good example would be John Hollands Fenian Ram. A later example would be the German Delphin midget sub.
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Old Sep 23, 2013, 01:41 PM
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Originally Posted by SSgt Baloo View Post
Thanks!
Most welcome
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Old Sep 24, 2013, 11:01 PM
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you could also go another step, use an aircraft design in the water like i played with here:
Underwater Glider (4 min 46 sec)


another thread worth a look thats got cool dynamic divers: http://www.rcgroups.com/forums/showthread.php?t=1982356
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Old Sep 25, 2013, 12:38 PM
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I have wondered the same thing for a while. Why not 'fly' an rc airplane under water? I would think even a plastic scale model of a WWII plane would fly quite well in the dense atmosphere of your local pool. Instead of the small scale making everything go so fast this would be like flying in slow motion. A very small prop with active control surfaces and your off! Even add in landing gear. The models would be negatively bouyant so you would have to take off from the bottom. Lots of great examples already like the Flying Sub from Voyage to the Bottom of the Sea, the starship Enterprise, etc. If I had regular access to a big swimming pool I would consider it.

Dave
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Old Sep 25, 2013, 08:00 PM
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Quote:
Originally Posted by boater_dave View Post
I have wondered the same thing for a while. Why not 'fly' an rc airplane under water? I would think even a plastic scale model of a WWII plane would fly quite well in the dense atmosphere of your local pool. Instead of the small scale making everything go so fast this would be like flying in slow motion. A very small prop with active control surfaces and your off! Even add in landing gear. The models would be negatively bouyant so you would have to take off from the bottom. Lots of great examples already like the Flying Sub from Voyage to the Bottom of the Sea, the starship Enterprise, etc. If I had regular access to a big swimming pool I would consider it.

Dave
we tried rubber powered 'free flight'? back in the sixties,I think there was an article in model boats magazine, we used a 1-72 airfix p51 with fine rubber gleaned from the innards of a golfball,by putting trim tabs on the control surfaces the model could be made to climb/bank etc whilst under power using the airfix scale prop! it was śnreal'the aircraft actually "flying"through the water in slow motion, unfortunately I no longer have a swimming pool for experimentation.
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Old Sep 25, 2013, 08:23 PM
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I'd like to see something like an F-15 or any other fighter jet with either a small sub prop added on the back or a water jet in the engine flying an aerobatic routine underwater. Dogfights would be cool, too.
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Old Sep 26, 2013, 09:43 PM
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Balsa Wood Plane Flies Downwards Underwater Upside Down :-) (1 min 20 sec)


balsa plane flying underwater (1 min 9 sec)
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Old Oct 01, 2013, 12:28 PM
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Quote:
Originally Posted by derk View Post
you could also go another step, use an aircraft design in the water like i played with here: http://www.youtube.com/watch?v=y1MmMQy3XbI

another thread worth a look thats got cool dynamic divers: http://www.rcgroups.com/forums/showthread.php?t=1982356
I used to do that in the bathtub with model planes when I was little.
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Old Oct 01, 2013, 12:35 PM
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There's always this:
http://www.swimways.com/toypedo-c-29.aspx
But I think it just relies on neutral bouyancy. There are more than a couple of dynamic diving toys, though.
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Old Oct 02, 2013, 11:42 AM
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Actually the toypedo is heavier than the water, i have a big one and some little ones. Its big enough that I have thought of using it for a mold for a sub hull
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Old Oct 09, 2013, 12:31 AM
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Submarine Star Tek Enterprise:
USS.ENTERPRISE NCC-1701-A  R/C STARSHIP SFYDD PV02 (7 min 26 sec)
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