RE: Can you believe this flies?  
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RE: Can you believe this flies? - 3/5/2008 1:06:36 AM   
owner


 

Posts: 2
Joined: 8/10/2002
From: Mosier, OR, USA
Status: offline 		Hello Dick, I'm a Roy Cough fan too. I have built the dragonflyer, roto thing and am now building the Martian Space ship. I got the plans from Bill Northrup a couple of years ago. I love his stuff and like you am in a continuous pursuit of plans of his. He was a prolific designer and published all kinds of places so it is a tough job finding plans. Any help in that regard I would greatly appreciate it.

I'm going to make a few changes and would like your input on it. As you can see, I got tired of sticks and went to Blue Foam; why not? I'm also going to blue foam for the outer strakes reinforced with either balsa or carbon tow.

I also put in elevons for control and made a foam cover. The entire tail section is held with two nylon machine screws.

I'm going to put in an LA 40 instead of 25. I don't think the weight will be much different, but I will have more power and as I under stand it, rocks and the Martian Spaceship have about the same glide.

Once I get this thing to fly, probably a couple of weeks, I think I will make another one, same size, but entirely blue foam and use and AXI 2814 for power.

Arthur



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(in reply to dicknadine)
       Post #: 26

RE: Can you believe this flies? - 3/6/2008 11:39:07 PM   
Stick40



Posts: 233
Joined: 8/20/2007
From: Escanaba, MI, USA
Status: offline 		OK, im am not able to find the videos on the site given!Help!

Stick 40

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(in reply to owner)
       Post #: 27

RE: Can you believe this flies? - 3/19/2008 9:10:15 AM   
old git


 

Posts: 705
Joined: 3/10/2004
From: BelvedereKent, UNITED KINGDOM
Status: offline 		I believe the Zeppelins and other "lighter than air" craft regularly flew with negative buoyancy.

Skyship 600? used vectored thrust to take off (with a run) and elevators controlling altitude.

It would be very limiting to use ballast or to vent gas to control altitude. They commonly used
and still use angle of attack to produce the required positive or negative lift.

Note, the do not have any lifting strakes along their length.



old git - - - - - aka John L.

(in reply to rainedave)
       Post #: 28

RE: Can you believe this flies? - 3/19/2008 2:57:27 PM   
50+AirYears


 

Posts: 1147
Joined: 7/29/2004
From: Lorain, OH, USA
Status: offline 		I belive even current Blimps actually maintain negative buoyancy. I had the chance to watch a couple lift off locally, and both times I remember people on the lines only holding the ships from being blown around on the ground, till other ground crew grabbed hold of the side rails on the cabin and "Bounced" the ship up and down several times against the LG strut. The airship obviously was eventually released on the rebound which got it off the ground, at which time the pilot kicked what looked like full UP elevator and gunned the engines for a high angle of attack climb-out.

First time I saw it was with a Navy blimp taking off from our former Naval Reserve facility in the early 50s, and the second time was a Goodyear blimp taking off from Cleveland's Aviation High School parking lot during a Cleveland Air Show sometime in the mid 80s.

I also read this was a normal procedure in an old Air Progress magazine.

(in reply to old git)
       Post #: 29

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