Moebius FS-1 Flying Sub reissue

[PaulC]

Kits are now shipping. Mine lifted off from CultTVManShop today.

[JWLaRue]

hmmm....."improved hull tooling".....

Any of our resident VTTBOTS experts out there that can comment on the accuracy of the first release?

-Jeff

[Guest]

I understood that they created the first model using a scan of an studio model, with some small adjustments to correct asymmetry.

I read somewhere or other that the alterations are to improve, or move the seam/join between the two hull halves.

[bigdave]

I heard seam joint and crew I think.
Fairly easy to RC. BD

[PaulC]

Dave, what were the make of those bilge pumps Rick uses in his builds? I know I had it somewhere I just can't put my finger on the info.

[bigdave]

Anybody building a FS1 for RC here is a link to pumps I purchased that will work very well.
They are $80 pumps normally. Sometimes they sell them for $10.
Good starting point. I have a build I did in the up and coming SCR on my FS1.
These pumps could easily be substituted for the pump assemblies I made.
I am not sure about the pumps Rick uses.
He can chime in hopefully and supply the info.
Rick is the FS1 man. And the Seaview man for that matter. BD

http://www.goldmine-elec-products.com/prodinfo.asp?number=G20108

[PaulC]

Nice Flying Sub build article, BD. What are the dimensions of the Otterbox you used? I'm curious how much internal headroom there is in the hull.

[JWLaRue]

BD,

I assume that the Graupner jet drives are no longer available? (At least I can't seem to find them the last time I looked)

-Jeff

[silent runner]

Graupner has stopped making the jet drives, schottel drives, etc, at least for the time being. I know one can still get these: https://www.kehrer-modellbau.de/en/c...x/sCategory/38 But do not know if the size is usable. I have often considered using these in the Flying Sub. http://www.engel-modellbau.eu/catalo...oducts_id=1968

Michael

[Guest]

What is the advantage of a water jet over a conventional ducted prop in a submarine?

[ober freak]

Kort nozzles, bow thruster and water jets are all ducted props by design. Their advantage is the lower needed draught due to smaler screw diameter. The jets sucks water from the bottom and are able to push it into the air behind the stern, no need for the exhaust to be under water (also less draught needed). And a smaller screw diameter means higher RPM, so no need for reduction gears in small boats with high RPM enginges.

[Guest]

Understood, but in a submarine where the drives are submerged, i see no advantage, so just use ducted props, which are easy to diy.

[ober freak]

Those water jets mostly incorporate a thrust vectoring nozzle. With 2 jets u could use this as dive planes an differential thrust as rudder. I think the descision is more how to hide the intake. Jets have them on the bottom, diy ducts where probably straight through so the intake is mostly on the front. But on a model there is not realy a difference despite the way water flows through the system.

[bigdave]

Ducked props work well too. That is what I have in my Cylon Raider.
I used the Graupner pumps because the one I based my build on was using them.
Plus I liked that ducting the thrust up and down was as easy as mounting the steering nozzle 90 deg off.
And it is a stand alone pump unit. Easy to work with.
Plus sucking the water from lower in the hull like Ober said does work better near the surface than the ducted props.
My Cylon Raider will suck air when to close to the surface. My FS1 won't.
All that said if I did the build again I would use bilge pumps like the ones Rick Teskey uses or the Rule pumps I found.
It's just easier to have an all in one motor/pump in a sealed unit.
Plus both models run much better at a slower speed. I will get the part number for you Paul for the OtterBox.
BTW the Otterbox web site and ordering is very easy to do. BD

[tsenecal]

the graupner jet pumps are no longer available, but a chinese company "NQD" sells 19mm diameter pumps with 380 size motors on ebay... roughly equal to the smallest graupner model. search for "NQD 757" and you should find something.