buoyency help

[danl]

All the above is well

All the above is well and good, but when I was trying to get the ballast just right for the Trumpeter Seawolf, getting near "neutral bouyancy" was no big deal. The big deal was getting the sub to be consistently level when at rest. For example, I was able to get the boat to hover just inches below the water, but stern was noticably low in the water. As I fed air to the bag, the sub would rise, but the stern rose faster than the bow. Now, with the sail out of the water, the stern was too high. Pumping in even more air, the sub went to the waterline and very level in the water.
What seems to be coming into play is the different weight distributions of components in the WTC fore and aft, above and below thw waterline at any given depth.
Anyway, with bits of lead and bits of foam, after maddening sessions in the tub, I eventually got the sub consistently level at various depths.
Note that all this is at static conditions -no forward motion - and that the APC unit would likely level the sub out when underway even if bouyancy distribution wasn't "perfect".
Another prob with the bag system was inconsistent bag geometry and an air pump that blasts way too much air in a burst to get any precision in depth control. I think that could be improved by plugging the air feed line and then drilling a very small hole (#80 drill or even smaller)in the plug, creating a low flow orifice. The other "fix" is wrapping the bag with a pressure plate and rubbe bands to better control inflation and deflation geometry. Have done both and I can actually get about 1/2" depth resolution in the bathtub. Don't know if this means anything in the real world when the sub is actually moving and you can control depth with dive planes, but it's cool to see in the tub.

[mylo]

Albion,

I just got a

Albion,

I just got a report from one of our over seas operatives. They were able to smuggle the plan set for the top secret prop for the "wheelersub". As I speak, we are receiving the uplink data transfer for the schematic via quadruple encription. I hope this information was worth it, it cost us a good man in the field.

.....stand by.........


.....DATA upload COMPLETE !

We have it gentlemen, we have the prop design for the wheelersub in our hands. Submarine technology and advancement is about to take a huge leap forward.

BEHOLD ........... The WHEELERSUB PROP DESIGN.





wheelerdealer ........couldn't resist. All in the name of ....getting a laugh at someone's expense when they were only trying to be helpful

[Wheelerdealer]

Ahh ...close but no cigar.

Ahh ...close but no cigar. the prop design of the Wheelersub© is a closely gaurded design and will never be represented in drawings. Furthermore, to avoid copies of the revolutionary Wheelersub© turning up in 1/25 scale, all public plans will have the proportions randomly altered and shown rendered using Freeware and not AutoCad.

[Guest]

I tell you what, you'll

I tell you what, you'll have a heck of a time trying to get that prop balanced!

[mylo]

wheeler figured it out......THAT is

wheeler figured it out......THAT is why this prop is so special.

At first glance, it may 'appear' unbalanced, but using the coificient of the negative inverse drag factor, combined with the thrust geometry of -.233405 coupled with the hydrodynasymbiology quotient, which according to the wheeler design, is 3453/12.34, we see that, in fact, the wheelerprop is a marvel of modern engineering as it's final result = 0 ....a PERFECT balance. Wheeler clearly is a hydromechanical genius.

....this prop is going to revolutionize underwater propulsion as we know it.

Mylo

[oracle_9]

According to the drawing, the

According to the drawing, the prop appears to bend light, thus rendering it invisible.

LOL