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Jan 21, 2013, 11:55 AM
Registered User
Quote:
Originally Posted by FireFlyer451
Brettbb,

Just a clarification question on the trigger release. Referring to your photos in #9, Is the release pin simply held in place by the tension of the pin against the launcher tray/plate? And when you push down on the extension sticking out of the end with your foot, it releases the launcher plate?

How is that foot release tube attached inside the larger, longer rail?

Thank you,
M
If you look at post #9 picture 2, I have made a red circle around the rivets that hold the 12mm square tube in. The pin is a partly threaded bolt with its head cut off and is bolted through the 12mm square tube diagonally.

The distance between the rivets and the pin is about 500mm which gives it enough flex to create a "spring". When you push down on the 12mm bar it flexes pushing the pin down.

Hope that makes sense.
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Jan 22, 2013, 12:26 PM
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FireFlyer451's Avatar
That clears the release pin up, thanks a lot.
Feb 03, 2013, 08:23 AM
RID
RID
Registered User
You have heard. Catapult is not so safe. At disrupting the truck off the hook, it can bring harm. Look at the video and see, the probability of injury.
Longer use the catapult, the higher the probability of malfunction-zi wear.
I would advise you to make an additional retainer pin.
After preparing a catapult shoot additional lock with a cord. Catapult ready to launch.
P.S. I apologize for my English.
Feb 04, 2013, 10:01 AM
Registered User
ScottTurchin's Avatar
What grips the aircraft to the mount?

In other words if I just set my Zephyr on there, what's to keep the catapult from pulling out from underneath it?

Nice design!
Feb 04, 2013, 11:50 PM
Psionic001's Avatar
Subscribed.

This is a simple and elegant solution.
Per the previous post. How well does the X8 grip to the sled, and has it damaged the wing in any way with the launch force?

Cheers

Matt
Feb 06, 2013, 12:32 PM
Keep calm and carry on.
Oso M's Avatar
Great design..
Feb 07, 2013, 03:44 PM
Vote F5J Gracia for FPV
sgrouts's Avatar
The x8 does not get damaged during launch.
You can see that the creator strategically positioned the pushing plates exactly at the spot where the wings join with the fuse.
That spot is heavily reinforced foam with double wooden plates where the cf spars go through.
Sakis
Feb 07, 2013, 05:39 PM
Registered User
THESANDMAN's Avatar
can this be used to launch hi performance (150+mph)stykers and funjets
Feb 07, 2013, 05:57 PM
Psionic001's Avatar
I think it's a good idea for most fun jets. But if the funjet is too powerful it just torque rolls on launch and this launch angle would not work.

This is my FunJet, and it rolls at least 5 or 6 times on launch before I have any aileron authority, therefore I have to do vertical hand launch..

Fastest Funjet Ultra 184MPH (296km/h) (2 min 9 sec)


But if we could rig this catapult to also do a vertical launch it would be great. I would need to enhance it so I could go say half throttle and it would have a hold down mechanism that unlocked at the end of the rail, otherwise it would jump off the blocks early.

Cheers

Matt


Quote:
Originally Posted by THESANDMAN
can this be used to launch hi performance (150+mph)stykers and funjets
Feb 08, 2013, 08:27 PM
Registered User
THESANDMAN's Avatar
Quote:
Originally Posted by Psionic001
I think it's a good idea for most fun jets. But if the funjet is too powerful it just torque rolls on launch and this launch angle would not work.

This is my FunJet, and it rolls at least 5 or 6 times on launch before I have any aileron authority, therefore I have to do vertical hand launch..

http://www.youtube.com/watch?v=26B39689ct8

But if we could rig this catapult to also do a vertical launch it would be great. I would need to enhance it so I could go say half throttle and it would have a hold down mechanism that unlocked at the end of the rail, otherwise it would jump off the blocks early.

Cheers

Matt
that funjet is past hi performance , that is more like extreme performance.i have the proper parts to get to that level ,but my skills arent ,so the parts are still in my parts bin.my funjet/strykers are only pushing 140 level and maybe 150 on a dive . so i dont think i would need a vertical set up, the way this lauch is set up now" the unlocking mech woud be viable for my application" ,since i have just a slight torque roll when i hand launch my ships.. i can see why yours would need a more vertical aproach.,
Feb 09, 2013, 12:04 PM
In 1 piece? Not for long...:)
wdog's Avatar
Any way that the cart/holder could be modified so that the tail of nonflying wing aircraft wouldn't hit it on takeoff? i.e the regular Skywalker?
Feb 12, 2013, 01:34 PM
Registered User
Quote:
Originally Posted by ScottTurchin
What grips the aircraft to the mount?

In other words if I just set my Zephyr on there, what's to keep the catapult from pulling out from underneath it?

Nice design!
Quote:
Originally Posted by Psionic001
Subscribed.

This is a simple and elegant solution.
Per the previous post. How well does the X8 grip to the sled, and has it damaged the wing in any way with the launch force?

Cheers

Matt
Have a look at the 2 pictures attached. It clearly shows how the wing slots into place. Im sure it will launch a zephyr perfectly as it is.
There is no damage done to the wing what so ever.
Feb 16, 2013, 07:23 AM
Registered User
emax's Avatar
It's the simplicity which makes it so genious. A very convincing concept and build!

Question: You've made kind of 'clamps' around the wing. Is this to prevent the wing from pitching up upon launch? Or would a 90 degree upwards pointing pusher at the lower end suffice as well?
.
Feb 16, 2013, 11:00 AM
Senior Gravity Checker
With increasing tension your gantry is going to always slam into the end of your launcher. May I suggest you lengthen the launcher and put the attachment point for the bands about 1.5 foot back and looped underneath. Thus when the plane launches the bands will self brake the gantry,
Feb 18, 2013, 01:57 PM
Registered User
tty044's Avatar
I think I will make such device too. Do you have any licensing policy?
My main problem is getting latex 10mm tube. Is there any internet shop with it? I have found something here but the prices are insane...
Regards
Michal


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