how small can the fins be made and still stabalize the rocket?
156071
depends on length and speed of rocket,(and many other pain in the butt things) the longer the rocket, the biger the fins, the faster the rocket, the smaller the fins
1042790
It seems research on this has continued. Still sounds very preliminary though - experiments on small models or paper planes ;)  But maybe you'd like to check the links.
904882
beyond the positive aspect of convenient surf travel there are two other important reasons why removable fins are so much better.\n\njust like glass-on fins can get broken in travel, they also break surfing.  if you land on a fin, or hit a rock/reef, it will break.  if you have glass-on fins, this will probably cost $70-100 to fix.  however, if you surf with crappy plastic fins, the fin just breaks, falls off, and you buy a new fin for $10 (the board is fine usually)  it's great.\n\nalso, since the fins are removable, you can swap 'em around.  i can ride my 6'0" in waist high mush, or in surf up to about 8 ft. before I want a bigger board.  however, do you think I want the same fins when i grovel in waist high, and when there are 8ft barrels?  if those were glass-on fins i would need two boards.  iinstead i have six fins.
199267
well, i don't see why not.  if you made the thrusters such that the thrust was directed tangentially, that would cause the saucer to spin in a circle.  if you then added some kind of protruding airfoils (like helicopter blades) these would provide lift, but in the upward (axial) direction.  \n\nhowever helicopters can fly forwards and backwards by essentially tilting their rotors;  i don't see any reason why that wouldn't work in this case as well.
13706
There are way to many factors to give an answer..\nWhat is the hull design? Weight? What is your goal? top speed?? are you willing to sacrifice your hole-shot for a few mph? approx shaft hp of motor? what RPM range will the motor be operating in?\n\nContact a reputable prop manufacturer. ie Oakland Johnson
870849
Depending on the size 3-5 mph
915015
You would need a tank about the size of a house (55ft cube) unless you compress the air then it would be much smaller.
39004
Its not impractical because you have perpetual motion in space get it spinning and it will spin forever at the same speed.  No friction.  Thats the only way to do it because you can create Gravity like on startrek
689832
The object must be less dense than the fluid to float, and more dense to sink.  If it is exactly equal density, then it can be suspended.
176148
Check out Estes Rockets and buy a complete kit, easiest way to get started.  Should be available in local stores also.
459122
the side length is 2\nso the altitude should be 3^(1/2)\ngood luck
212075
Nasa does, apparently they made it work too.\n\nGo to your nearest hobby store, look at a model rocket , the one that actually work and the times that by a 100, add some heating and air tanks, etc .\n\nBudget for a couple of 100million dollars or take a VirginSpace flight at $200,000. He's selling tickets now. Cheapest way.
506465
Kayak, not as easy to tip over and more comfortable to row in.
33050
I have been looking at this myself and the general feeling is as long as you get your body horizontal to the ground thier is not much more you can to to improve aerodynamics. Their is a good few pages on lance armstrongs and the discovery teams web pages on aerodynamicss, check it out.
314204
Because of the weight of the sticks, you will probably need to split them into 1/4 or 1/8 widths, wet them and curve then for the wing shape (rounded on top), and then glue them in a framework. Use tissue paper. If you make a propeller, you could power it with a wound rubber band.\n\nConstructions such as this were made by aeronautic teenagers 50 years ago, but they usually used balsa wood.
270411
Seems to me that padding is the answer.  Could you wrap it in several inches of padding to soften the blow from the landing?  Maybe try some bubble wrap, etc.
652500
Answer A) Small size & rocky surfaces