Stingray Build

[He Who Shall Not Be Named]

That's an interesting Seaview model, looks like the next evolution, I like it.

What effect do you think the cabin wings will have on the dynamics of the model when submerged?

I would like to get your jet unit David but can't find it in the store, is it still available?

Yeah, I'm worried about those two big dorsal fins too, Captain. They look to have positive incidence to the boats longitudinal centerline. They're very close to the boats CG, a bit aft of it, so the pitching moment is short and they won't be much consequence to the dynamics of the thing. But, man! the drag they will introduce!

What 'jet unit'. Be specific. And what's the application. I'll fix you up.

David

[Captain Scifi]

That's an interesting Seaview model, looks like the next evolution, I like it.

What effect do you think the cabin wings will have on the dynamics of the model when submerged?

I would like to get your jet unit David but can't find it in the store, is it still available?

[He Who Shall Not Be Named]

Will do. I'll get that unit and take it from there.

I also realize, after examining that ad photo of the pump-jet nozzle, that the nozzle is not gimbaled -- it only provides for one-axis pointing of the stream. Yaw only. I'll have to work up a two-axis gimbaled nozzle that will fit over the stator tube and not get in the way of your RateMaster drive wheels. That will happened when I get the parts in hand and can size things to work within the geometry presented.

Below are shots of the two-axis PJ I worked up to steer and dive the DeBoer Concept-2 SEAVIEW model:

[RCnut]

Ok Heres the first thing, The kehrer I was going to send is junk as they have upgraded it anyway. this is what you will need.

http://www.jet-drive.de/index.php?page=shop.product_details&flypage=shop.flypage&product_id=9&category_id=4&manufacturer_id=0&option=com_virtuemart&Itemid=17&lang=en

And this is what I had to do to make it conform. So You would have to order a spare Stator box as well.

[He Who Shall Not Be Named]

Lol Is that rain as well? Cheers David, I am a Plane flyer and have a fondness for banking and yanking. I cant do much more till The WTC is sorted so with that in mind I will sort out a set of parts in the next couple of weeks and send the whole kit and kabboodle to you.

Excellent. Then your transition from airplane to this beast is a simple one: you will fly STINGRAY around -- just a slower airplane.

If you do make the stern horizontal stabilizers working control surfaces, gang them to the linkage that operates the gimbaled PJ nozzle about the pitch axis. That would insure pitch control even if you throttle back on the PJ.

When I get the kit I'll size a SubDriver for it, outfit it, get my STINGRAY working (control surface linkages as well as the scavenging type ballast system that'll be used to de-water the hull) thenI will freeze the design. I then build up and outfit (less receiver -- you UK types have your own legal bands that I don't have receivers tuned to) a SubDriver for you, as well as the mechanisms that will employ your PJ hull mounted intake portion to take a suction on interior water to get the STINGRAY to a high freeboard when surfaced, and send it all to you in exchange for the STINGRAY kit.

Can't wait. You have created a beautiful model there and I want to do it justice with the mechanisms needed to animate it. I'll need to know what motor, ESC, and battery (with dimensions) you recommend for that PJ.


I remain amazed at the speed and quality of your work!

Me? I like making weird things work well in the water. Below is the Rick Teskey kit r/c'ed.


David

[RCnut]

Lol Is that rain as well? Cheers David, I am a Plane flyer and have a fondness for banking and yanking. I cant do much more till The WTC is sorted so with that in mind I will sort out a set of parts in the next couple of weeks and send the whole kit and kabboodle to you.

[He Who Shall Not Be Named]

It's a no-brainer to me. To make tight banking turns you'll work the STINGRAY 'wings' as ailerons.

So, transmitter right stick, left-right axis will control roll, and up-down axis on the same stick for pitch control of PJ's gimbaled nozzle -- banking turns coordinated with 'elevator'. Put rudder on the transmitters left stick to yaw the PJ nozzle.

Slave the elevator (PJ nozzle pitch axis) to an on-board angle-keeper -- this is a 'must have' feature. You will
remain in the control loop, but the angle-keeper will keep the boat honest about the pitch axis automatically when you're not attending to control of that axis.

Configure the transmitter just as you would for an airplane. 'Fly' into the turns with aileron, elevator and rudder coordination.

If you're not a plane flyer already, invest in a good quality simulator system. You're gonna be busy at the sticks with this one!

ch-1 is aileron (differential use of the 'wings' on the STINGRAY)
ch-2 is elevator (PJ nozzle pitch axis)
ch-3 throttle
ch-4 rudder (PJ yaw axis)
ch-6 ballast sub-system


I have spoken, so let it be written (crack of thunder).



David

[RCnut]

Just done a bit today, top of the periscope and I made up the linkages for the side fins. I still dont know whether to have them both linked or seperately controlled as they were on the RA models one.

[RCnut]

Just a couple of comparison shots of the jet drive plates, You can see my efforts and then the Laser cut ones Bernies done, Also the different Nozzel that comes with the Kehrer jet, much better!

[Captain Scifi]

Glad you liked the parts very happy to help out on this build, Stingray is such a great design but so very difficult to get right. I have to say it looks like you absolutely nailed it capturing the curves of my favourite of the studio models.

You have made life easy by building such a good quality kit to begin with, great work mate...!

[RCnut]

Cheers guys, I will clean up and hopefully Start on an interior soon. Probably not suitable for an RC version but Bernie will produce a frosted cabin so the windows will still look good. I had those Laser parts delivered today, They were quite superb, however they needed a few tweaks which are in hand, When there done I will post pics and they will be offererd as an option for those wishing to go the RC route.

[greenman407]

Superb......as usual. I would expect nothing less from you.

[RCnut]

Done the cabin fins and Conning tower today.

[greenman407]

I think Bernie is the one that helped me get in touch with you originally when I was trying to buy, borrow, steal, anything to get a Skydiver from you. ONE DAY SOON.................I will begin again.

[alad61]

Wow!.......

What he said... And then some!!!