Other Jimness > Cinder Spires Books
Sails?
wrangler:
--- Quote from: knnn on October 23, 2015, 06:59:59 PM ---To expand on Quantus' response, this only happens when you are going at the exact velocity of the wind.
--- End quote ---
As do all aircraft, unless another force is applied; surface area, etc., don't matter. Once you leave the surface, and are in the air, you're moving with that air. And when you add power (or force), the only air motion relative to the aircraft is due to the aircraft motion because of that power (or force). A sail wouldn't help an airship under power any more that it would help an airplane. You'll note that sails have never been used on dirigibles or blimps. They won't work.
knnn:
--- Quote from: wrangler on October 23, 2015, 07:30:13 PM ---As do all aircraft, unless another force is applied; surface area, etc., don't matter. Once you leave the surface, and are in the air, you're moving with that air. And when you add power (or force), the only air motion relative to the aircraft is due to the aircraft motion because of that power (or force). A sail wouldn't help an airship under power any more that it would help an airplane. You'll note that sails have never been used on dirigibles or blimps. They won't work.
--- End quote ---
And how do you explain the ability of powerless hand gliders to manouver?
Edit: To explain, it's the constant slight downward movement of the glider that allows the airflow to create some of the lift, allowing you to manouver. A ship like the Predator could fluctuate between slight negative boyancy and slight positive boyancy (using the crystals) and use things like airfoils to change direction.
wrangler:
--- Quote from: knnn on October 23, 2015, 07:36:17 PM ---And how do you explain the ability of powerless hand gliders to manouver?
--- End quote ---
The force of gravity will pull a glider "downhill", resulting in airflow over the wing and tail. Control surfaces on the wing and tail will change their airfoil shape slightly, changing lift and drag, causing changes in pitch, yaw, and roll.
I used the term "force" in my earlier post with gravity and gliders in mind.
knnn:
--- Quote from: wrangler on October 23, 2015, 07:47:49 PM ---The force of gravity will pull a glider "downhill", resulting in airflow over the wing and tail. Control surfaces on the wing and tail will change their airfoil shape slightly, changing lift and drag, causing changes in pitch, yaw, and roll.
I used the term "force" in my earlier post with gravity and gliders in mind.
--- End quote ---
That's what I was suggesting above (notice my edits). That the Predator create a slight negative/positive boyancy (with the crystals), allowing the sails to act as airfoils.
wrangler:
--- Quote from: knnn on October 23, 2015, 07:50:30 PM ---That's what I was suggesting above (notice my edits). That the Predator create a slight negative/positive boyancy (with the crystals), allowing the sails to act as airfoils.
--- End quote ---
As I pointed out, there's no "wind" for the sails. Any research you do will usually refer to balloons as "moving with the wind", because it takes another force to move them.
Perhaps the FAA's Balloon Flying Handbook: https://www.faa.gov/regulations_policies/handbooks_manuals/aircraft/media/FAA-H-8083-11.pdf
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