Can a jet drive stator stator fully counteract the motor torque reaction?

[Mermaid]

Yes Rick, the velocity ratio IS quite high. I should mention that the Albacore used variable pitch props with the pitch being specified at 0.7 r. The Albacore had STUNNING performance being able to achieve 30+ knots underwater on battery power!! I only included the picture to illustrate what I was talking about regarding relative propeller pitches. I would not consider using this particular configuration on a model torpedo although I am adapting this design for a 1:32 scale model of the SSN-605 Jack. She was the ONLY US nuclear submarine adapted to employ a contra-rotating propeller drive. Jack's drive design was spurred by the exceptional performance of the phase IV variant of the system developed by the AGSS-569 Albacore research team. (below, bottom and the photo) Unfortunately, the Jack's designers strayed too far from the Albacore design and her performance was rather disappointing. Eventually, the ship was retro-fitted with a conventional single propeller drive. With the model, I plan to correct the mistake made on the Jack. The propeller configuration will be almost identical to that of the phase IV Albacore except that they will be about 14% over-sized (to improve efficiency) relative to the scale Jack props. The model will have a max design speed of APR 5-6 knots, surface area of 3,647.24 sq in, (25.328 sq ft) dived displacement of 336.1 lbs and measure 11.925" x 112.454" I have adopted a fixed pitch propeller setup rather than the variable pitch used on Albacore. Fwd prop: 5.3437"D x 6.424"P. Aft Prop: 4.44044"D x 7.695"P spaced 2.3379" apart. I'm not sure how much power it will take to get to 5 knots. my ball-park estimate is about 350W/shaft. The torpedo should be operational within a year if it is built at all. The project is more of an exploration of design options than anything else.

[Mermaid]

Dear Rick: I'm having a couple of problems with this site so I need to ask a couple of seemingly dumb questions. (1) How does one mark a reply as read? (2) How does one reply to a private message? I have one private message so far but try as I might, I cannot open the message on the site nor find any means to reply.

[Guest625101138]

Originally Posted by Mermaid

Dear Rick: I'm having a couple of problems with this site so I need to ask a couple of seemingly dumb questions. (1) How does one mark a reply as read? (2) How does one reply to a private message? I have one private message so far but try as I might, I cannot open the message on the site nor find any means to reply.

It may depend on how you have selected your default screen but the one I use has the Private Message link hypertexed to the slightly light blue "Private Messages" text under my welcome in the upper right hand corner of the window.

If you left click with the mouse over this hypertext link it will open a new page. You then left click on the message in the list and it will open the new message. From there you can choose to ignore or reply.

Rick W

[Mermaid]

Thanks Rick: I've finally managed to reply to my personal messages. I STILL don't know how to mark a reply or message as read. The site indicates that I have about eight unread replies yet I have read every single one.

Best,

Mermaid

[Guest625101138]

It might reset if you log off and come back in.
Rick

[Mermaid]

Thanks for the advice Rick. I've logged off and back on again and my unread relpys show empty.