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Author Topic: Okay I've been watching u tube
TheMoMan
BlabberMouth, a Blabber Odyssey
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Icon 1 posted December 05, 2010 08:33      Profile for TheMoMan         Edit/Delete Post   Reply With Quote 
____ A while ago I posted a u tube video from the ETOC well here is a new one.

http://www.youtube.com/watch?v=IGPBCOnY_ag

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Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.


Benjamin Franklin,

Posts: 5848 | From: Just South of the Huron National Forest, in the water shed of the Rifle River | Registered: Sep 2002  |  IP: Logged
Ashitaka

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Icon 1 posted December 05, 2010 09:16      Profile for Ashitaka     Send New Private Message       Edit/Delete Post   Reply With Quote 
you have to wonder what the thrust to weight ratio of such a model plane is compard to an actual.

I am pretty sure that with a normal plane, you can't put it into a nose dive, and then spin the prop fast enough backwards to stop the plane in mid air and then have it fly in reverse, tail first straight up.


But I would bet that this WILL BE POSSIBLE one day with big propeller driven planes. If you have a P51 mustang, with an electric motor powered prop, and a power source that could give you as much energy as you want with very little weight ( say a halfnium battery design), there are then no pHysics laws preventing you from doing this full size.

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"If they're not gonna make a distinction between Muslims and violent extremists, then why should I take the time to distinguish between decent, fearful white people and racists?"

-Assif Mandvi

Posts: 3089 | From: Switzerland | Registered: Feb 2006  |  IP: Logged
TheMoMan
BlabberMouth, a Blabber Odyssey
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Icon 1 posted December 05, 2010 10:12      Profile for TheMoMan         Edit/Delete Post   Reply With Quote 
____ Ash, The Harrior jets came out as I was getting out of the service. I happened to attend an Air show that had a US Marine unit in the line up.

____ Rollout and take off not much show actually appeared to be a slug. During a roll the plane started a spin fall, as it disappeared behind a tree line I was waiting for the fireball, been there a few times.

____ No fireball, then I see it rise over the tree line, dead on he had the bleachers in his gun sights. The pilot came across the field about five feet up. Stopping right over the tarmac in front of the bleachers, rotated CW then CCW. Then he lined up with the runway and backed up a few hundred meters, advanced his controls and put on one hell of a show

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Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.


Benjamin Franklin,

Posts: 5848 | From: Just South of the Huron National Forest, in the water shed of the Rifle River | Registered: Sep 2002  |  IP: Logged
The Famous Druid

Gold Hearted SuperFan!
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Icon 1 posted December 05, 2010 14:01      Profile for The Famous Druid     Send New Private Message       Edit/Delete Post   Reply With Quote 
quote:
Originally posted by Ashitaka:
But I would bet that this WILL BE POSSIBLE one day with big propeller driven planes. If you have a P51 mustang, with an electric motor powered prop, and a power source that could give you as much energy as you want with very little weight ( say a halfnium battery design), there are then no pHysics laws preventing you from doing this full size.

Not so sure about that.

As you double the size of the scale model, the mass will increase by a factor of (at least) 8, the area swept by the propeller will increase by a factor of 4, so to achieve 'hover thrust' you'll need to get twice the thrust per square metre from the prop.

Spinning the prop faster might achieve that, but then we're talking aerodynamics, and there's **nothing** intuitive about that, especially once the tip speed goes supersonic.

Delivering power to the prop is engineering, converting that power to thrust is witchcraft.

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If you watch 'The History Of NASA' backwards, it's about a space agency that has no manned spaceflight capability, then does low-orbit flights, then lands on the Moon.

Posts: 10680 | From: Melbourne, Australia | Registered: Oct 2002  |  IP: Logged
TheMoMan
BlabberMouth, a Blabber Odyssey
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Icon 1 posted December 05, 2010 15:17      Profile for TheMoMan         Edit/Delete Post   Reply With Quote 
____ This airplane made P-51s wet their pants.

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____ Now when the throttle was advanced to about 3100 Engine RPM the tips went sonic and the shock wave coming off of the prop would de-ice the wings. Normal take off roll out was below 2800 RPM to keep the left wing tip off the tarmac.

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Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.


Benjamin Franklin,

Posts: 5848 | From: Just South of the Huron National Forest, in the water shed of the Rifle River | Registered: Sep 2002  |  IP: Logged
TheMoMan
BlabberMouth, a Blabber Odyssey
Member # 1659

Member Rated:
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Icon 1 posted December 06, 2010 02:45      Profile for TheMoMan         Edit/Delete Post   Reply With Quote 
____ As you look at 752 notice the tail of the plane parked next to it, the one with GD on the tail that was the one I rode in the most.

____ As you look past the prop you will see a 1961 Ford Falcon parked right next to the door into Sick Bay that is where I was assigned stateside.

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Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety.


Benjamin Franklin,

Posts: 5848 | From: Just South of the Huron National Forest, in the water shed of the Rifle River | Registered: Sep 2002  |  IP: Logged


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