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Old Jan 06, 2014, 01:34 PM
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Launching Jet From Twine?

I had an idea for takeoff that may or may not work. Imagine I put two parallel pieces of very sturdy and smooth twine/string/cable across a 100 foot body of water about 3-5 feet above the water. I would then gouge out two parallel grooves on my jet that are equal width and spacing as the string. If I put the jet on the string then fired it up, would that be a reliable launching method? To counteract the bending of the string (which would make the nose point down), I would put the second string anchor higher than the first.
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Old Jan 06, 2014, 01:40 PM
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Here is a crude representation of the launch system.
http://i.imgur.com/7PuqMjU.png
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Old Jan 06, 2014, 04:06 PM
I broke it
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USA, NC, Clayton
Joined Feb 2001
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Honestly, I think you'd cut your wings off
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Old Jan 06, 2014, 04:33 PM
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Great Idea

Would you please post a video of your first attempt, should be interesting!
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Old Jan 06, 2014, 04:36 PM
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Where do you plan to land?
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Old Jan 06, 2014, 05:34 PM
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Maybe it's for launching this project?

http://www.rcgroups.com/forums/showthread.php?t=2062971
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Old Jan 06, 2014, 08:00 PM
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No. Let's just pretend that the previous embarrassment of a post didn't exist. This is for an EDF jet that will not do anything special but launch from twine. I was just musing in the other post, not thinking.

EDIT: I would land by setting the plane down into said body of water. It's foam so it floats.
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Old Jan 06, 2014, 08:16 PM
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Nevermind the video

It will be so fast we wont be able to see it.

Have Fun!


FPV Jet Budget?
I am thinking about delving into RC jets. I have played around with regular electric RC prop planes before, but my main interest is in electronics and software, in which I believe I am capable of the electronics and software I describe. I am considering making it my project to work on a miniature jet that:
1. ...can fly at 300 mph or more.
2. ...can switch from manual FPV flight to GPS-based autopilot and vice versa.
3. ...can fly for a range of at least 20 miles (and back).
4. ...has a wingspan of less than 1 yard.
5. ...has an entirely custom-built miniature jet engine.

I would construct the shell of the plane out of a 3D-printed material consisting of aluminum dust suspended inside of hardened nylon. The jet engine would be machined from medium-carbon steel. The control surfaces would be controlled by a miniature servo-based hydraulics system. The autopilot and software would be based off of the Atmega328 microcontroller (Arduino UNO). The engine would burn butyl alcohol, or butanol. It is very similar to gasoline. I realize that this is not a reasonable goal, but is it possible? I am setting my max budget at 2,000 USD. Is that reasonable?
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Old Jan 06, 2014, 08:49 PM
world's slowest builder
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So this is how Skynet begins...don't do it!!!
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Old Jan 06, 2014, 08:51 PM
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Joined Jun 2009
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Quote:
If I put the jet on the string then fired it up, would that be a reliable launching method?
No.

Why not do something really reliable and proven like a bungee launch?

Quote:
I would land by setting the plane down into said body of water. It's foam so it floats.
Yes, foam floats.
Do you have a plan for going out and getting the floating foam jet?
And what about the dunking that the electronics are going to be getting?
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Old Jan 06, 2014, 08:53 PM
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why aluminum dust....go for lithium dust suspended in polymer..and make the entire airframe the battery...and put a Stumax on that sucker! This is an electric jet forum after all.

butyl alcohol is for kids...
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Old Jan 07, 2014, 10:06 AM
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"...1. ...can fly at 300 mph or more.
2. ...can switch from manual FPV flight to GPS-based autopilot and vice versa.
3. ...can fly for a range of at least 20 miles (and back).


Lets hope HLS or NSA does not see this thread...
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Old Jan 07, 2014, 04:48 PM
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Is this what comes with legalizing marijuana?
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Old Jan 07, 2014, 05:41 PM
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Quote:
Originally Posted by PikeStaff View Post
Is this what comes with legalizing marijuana?
Yes, it is, as a matter of fact.

I'm not sure if everyone is making fun of me or just being critical. I'm sorry for being so unrealistic and making a post that a 10-year-old who watches Michael Bay films non-stop would make. I realize that an RC plane can't fly at 300mph or more and I am in no way capable of building a GPS-conscious autopilot system and I definitely can't go 20 miles in a model and FPV is illegal on jets and it is a feat unto itself just to put a turbine jet on an RC plane.

Yes, I do have a plan for retrieving the jet. I have a raft I can go into the water with and get the plane (it is pretty cold now, though). Making a waterproof compartment for the electronics is not hard.

The aluminum dust thing wasn't meant to sound really cool. I was considering 3D printing the plane's body in panels. This was a cost-effective option that does the job. http://www.shapeways.com/materials/alumide

Let's hope that the NSA/federal government DOES see this thread. That way they can rest assured knowing that they aren't the only idiots in town; there is some guy trying to build a magic camera-mobile in his garage that goes 20 miles.
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Old Jan 07, 2014, 06:07 PM
Do it Right, the first time!
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United States, MN, Hermantown
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They have a forum for this:

Modeling Science -- Physics, Aerodynamics, Engineering, Circuitry, and other scientific discussions.

http://www.rcgroups.com/modeling-science-136/
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