Everytime i launch my X8 it's never any problems. That was until i mounted a bigger propeller. I went from 13x6 to 14x9.5 and my plane "suddenly" went out of my hand much faster than before! The result is a painful hand and a lot of thinking :) Maybe some of you guys should think twice before you hand launch your new X8 or similar...

Now i'm considering several options:

1. Build a catapult

2. Hand launch engine off and throttle up after the wing has left my hand

3. Build a device where i can take off in a 30 deg. angle just by using the propeller power itself?

4. Any other ideas??

Views: 23826

Comment by Jesse on June 8, 2013 at 1:41am

Ouch! Although perhaps not the best photo to be on the front page of this site... for those squeamish amongst us... (like me! ;-) )

Comment by Lloyd Breckenridge on June 8, 2013 at 2:44am

This is the cheapest and safest way to launch an X8

All up about $30 worth of materials.

http://www.youtube.com/watch?v=KfVhfR4Cj_Y

I have never even considered hand launching mine.

Comment by Jared Reabow on June 8, 2013 at 2:53am

this is why i wing launch, just hold the par of the wing closeish to the center when you throw and you will be fine :)

Comment by Jared Reabow on June 8, 2013 at 2:55am

Wing launches allow you to throw much harder and they also allow you do do spin launches where you spin on the spot for extra speed and launch, mainly for large models that have a high stall.

Comment by Jason Wise on June 8, 2013 at 4:33am

Why a bigger prop in the 1st place?


Moderator
Comment by Dwgsparky on June 8, 2013 at 5:15am
A catapult is the safest option for flying wings, even the smaller X5 can do a lot of damage. They are safe and predicable. I have a design for a catapult for an X8 or smaller plane that works and is low cost, you can also buy the finished product or a short kit. Send a message. I hope your hand heals quickly.
Comment by Tommy Larsen on June 8, 2013 at 5:28am

@Jared: I will think about the winf launch

@Jason: I saw others fly with a much larger prop than myself so i wanted to try. I had one test before my hand injury and it looks very good with that prop size. Longer flying time on same mAh.

@Dwgsparky: I would like to see pictures/videos of your catapult and consider buying one.


Distributor
Comment by RC Tech.se on June 8, 2013 at 5:45am

In theory, i think you should be able to calculate the launch speed if you measure the distance between the cuts :-)

Comment by Tommy Larsen on June 8, 2013 at 5:55am

38mm between the cuts and 14x9.5 inch propeller. Be my guest :-)


Distributor
Comment by RC Tech.se on June 8, 2013 at 6:01am

Thanks! I think the RPM of the motor is needed as well. Really nasty cuts :-/

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