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Probably of interest for RC too, but mine is primarily static, so this goes in here.
After some research on the net, I find (not too unsurprisingly, given the sensitive nature of the information) that what the Seawolf pumpjet looks like is not clear at all, even approximately.
From what I hear about pumpjet design,
1. it is imperative that stator and rotor have different blade numbers, and both should be prime numbers to avoid vibrations;
2. pumpjets come as either the pre-swirl or the post-swirl version, depending on where they have their stators (in front of the rotor or behind it, resp.). Pre-swirl gives better quietness (=subs), and post-swirl better torque balancing (=torps).
My conjecture:
All models (and their RC adaptations) have stators in front of and behind the rotor, and typically the same number of blades for all. This seems to be incorrect.
Since Seawolf is optimized for quietness, it probably has a pre-swirl design. Assuming that the number of blades is higher than that of a normal propeller (typically 7), the next higher prime number would be 11. Stator blade no. must be different, that means it should be 7 or 13.
Any thoughts of the community on this?
The attached photo shows the Mk. 50 torpedo, which has a post-swirl design with 11 blades on the rotor and 13 on the stator.
After some research on the net, I find (not too unsurprisingly, given the sensitive nature of the information) that what the Seawolf pumpjet looks like is not clear at all, even approximately.
From what I hear about pumpjet design,
1. it is imperative that stator and rotor have different blade numbers, and both should be prime numbers to avoid vibrations;
2. pumpjets come as either the pre-swirl or the post-swirl version, depending on where they have their stators (in front of the rotor or behind it, resp.). Pre-swirl gives better quietness (=subs), and post-swirl better torque balancing (=torps).
My conjecture:
All models (and their RC adaptations) have stators in front of and behind the rotor, and typically the same number of blades for all. This seems to be incorrect.
Since Seawolf is optimized for quietness, it probably has a pre-swirl design. Assuming that the number of blades is higher than that of a normal propeller (typically 7), the next higher prime number would be 11. Stator blade no. must be different, that means it should be 7 or 13.
Any thoughts of the community on this?
The attached photo shows the Mk. 50 torpedo, which has a post-swirl design with 11 blades on the rotor and 13 on the stator.
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