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View Full Version : how to use a JATO


wambulance
02-12-2007, 01:54 AM
ok i was thinking that i wanna mod one of my planes with jato rockets for a huge boost in speed for a few seconds. How would i do this? could i just use mini model rocket engines as seen here

http://www.hobbylinc.com/htm/est/est1507.htm

or is there a homemade way do doing this?. BTW i am a complete noob to rockets.

B.L.E.
02-12-2007, 04:12 AM
I have seen someone do it. He used a 9V transistor radio battery with a servo operated switch to light the motor in mid flight. It was on a glider though.

This would be a cool project for a scale Bell X-1 dropped from a scale B-29. After the B-29 drops it, light the rocket and blast off.

Riverman
02-12-2007, 05:01 AM
I've conducted a few experiements here and there.

http://www.youtube.com/watch?v=B7UjtqppDL4 RATO 1 & 2
http://www.youtube.com/watch?v=2nXILLw6chg RATO 3
http://www.youtube.com/watch?v=2UJWKV42MKY Rocket Assisted Braking

redneckflyer
02-12-2007, 06:14 AM
I've conducted a few experiements here and there.

http://www.youtube.com/watch?v=B7UjtqppDL4 RATO 1 & 2
http://www.youtube.com/watch?v=2nXILLw6chg RATO 3
http://www.youtube.com/watch?v=2UJWKV42MKY Rocket Assisted Braking
with the short runway i have, this might be a good idea!:)
because i cant takeoff my aerobird extreme with the short of runway i have.


thanks for this idea Riverman! but i have a question, how do you ignite the rocket motors? thanks in advance!:)

wambulance
02-12-2007, 06:22 AM
^ yes how do you ignite and where and what type of rocket engines did u you

EpoweredRc
02-13-2007, 02:44 AM
ok i was thinking that i wanna mod one of my planes with jato rockets for a huge boost in speed for a few seconds. How would i do this? could i just use mini model rocket engines as seen here

http://www.hobbylinc.com/htm/est/est1507.htm

or is there a homemade way do doing this?. BTW i am a complete noob to rockets.

In your back yard, away from people I guess your allowed to do anything you want to try, But I am pretty sure putting rockets of any kind on your model airplane is against the law.
;)

EpoweredRc
02-13-2007, 02:46 AM
I've conducted a few experiements here and there.

http://www.youtube.com/watch?v=B7UjtqppDL4 RATO 1 & 2
http://www.youtube.com/watch?v=2nXILLw6chg RATO 3
http://www.youtube.com/watch?v=2UJWKV42MKY Rocket Assisted Braking

even ilegal, those 2 vids were pretty cool...

wambulance
02-13-2007, 03:06 AM
well im still willing to learn and try lol. pray i dont get sent to jail for being creative

EpoweredRc
02-13-2007, 03:11 AM
well im still willing to learn and try lol. pray i dont get sent to jail for being creative

as long as the FCC isn't around when you do it, you should be okay.

B.L.E.
02-13-2007, 03:15 AM
Rockets that can be fired from RC planes as projectiles is definitely against AMA rules and possibly illegal too but rockets used to propel model airplanes are probably legal. Model rocketry is legal after all. AMA rules are not laws but conditions that have to be met in order for them to underwrite a flying club.
I'm not sure if a radio control rocket powered Bell X-1 dropped from a scale B-29 counts as a projectile but an experienced and competent modeler could probably obtain a waiver to fly something like that, similar to the waivers needed to fly turbines on AMA fields.

Riverman
02-14-2007, 12:10 AM
ok i was thinking that i wanna mod one of my planes with jato rockets for a huge boost in speed for a few seconds. How would i do this? could i just use mini model rocket engines as seen here

http://www.hobbylinc.com/htm/est/est1507.htm

or is there a homemade way do doing this?. BTW i am a complete noob to rockets.

Wambulance

Estes rocket engines like the ones you linked to will work for RATO. I used them for my experiments. However, the size of engine that you linked to puts out negligable thrust for most RC airplane RATO applications. It really depends on the mass of the aircraft, of course. My point of reference is my Aerobird Xtreme, which ways about 2.5 lbs.
I started with single "A" sized engines to be safe. When I fired a single "A" engine (fixed to the A/C) in level flight, the nose just barely pitched up a degree or two for about a second. I moved on to "B" engines, and then multiple "B"s, until I finally arrived at "C" series engines. The videos you see on my YouTube page are done using "C" engines. The thrust generated by two "C" engines will put the Xtreme airborne in about 2 seconds from a standstill. Pretty impressive to see!
If you're serious about this, I recommend that your purchase an "Estes Blast Off pack", which comes with a range of sizes of rocket engines, 24 in total, and can be bought pretty cheap.
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXF416&P=M
This will allow you to start out with low power engines ("A"s) and experiment with what works for your particular RC. Be careful, and have fun!

Cheers!

B.L.E.
02-14-2007, 02:23 AM
Check out this video!

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

wambulance
02-15-2007, 05:10 AM
Wambulance

Estes rocket engines like the ones you linked to will work for RATO. I used them for my experiments. However, the size of engine that you linked to puts out negligable thrust for most RC airplane RATO applications. It really depends on the mass of the aircraft, of course. My point of reference is my Aerobird Xtreme, which ways about 2.5 lbs.
I started with single "A" sized engines to be safe. When I fired a single "A" engine (fixed to the A/C) in level flight, the nose just barely pitched up a degree or two for about a second. I moved on to "B" engines, and then multiple "B"s, until I finally arrived at "C" series engines. The videos you see on my YouTube page are done using "C" engines. The thrust generated by two "C" engines will put the Xtreme airborne in about 2 seconds from a standstill. Pretty impressive to see!
If you're serious about this, I recommend that your purchase an "Estes Blast Off pack", which comes with a range of sizes of rocket engines, 24 in total, and can be bought pretty cheap.
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXF416&P=M
This will allow you to start out with low power engines ("A"s) and experiment with what works for your particular RC. Be careful, and have fun!

Cheers!



how did u ignite it?

B.L.E.
02-15-2007, 06:05 AM
Model rocket engines are ignited with electric current. A special igniter wire is inserted into the nozzle and connects to a battery. A pack of rocket engines usually comes with these igniter wires. It's up to you to figure out a system to power the igniter. I have seen someone have success using a 9V transistor battery and a microswitch operated by a microservo. A cannon fuse lit with a match also works.

wambulance
02-15-2007, 06:39 AM
where can you buy fuses at. and how long to the engines last before it ends?

Riverman
02-15-2007, 11:09 PM
wambulance

The Estes engines burn from anywhere around .5 to 1.5 seconds, if I remember correctly. Not very long.

wambulance
02-16-2007, 02:23 AM
Cool that long but how did you ignite it. what was your method?

Riverman
02-16-2007, 03:04 AM
I used a spare channel on my radio to trigger a remote relay to supply battery voltage to the included igniters

Airhead
02-16-2007, 03:34 AM
Check out this video!

http://www.youtube.com/watch?v=GtIL_VjBUGo
Wow... I've never seen a B-29 that large before to begin with. Good show..:)
Thanks.

TLyttle
02-16-2007, 03:39 AM
Better be a good model to sustain that kind of thrust for such a short time. The Rapier rockets from Europe would be a better bet, as they have less power but a longer duration; much more realistic.

Solid Hit
02-16-2007, 04:41 PM
Check out this video!

http://www.youtube.com/watch?v=GtIL_VjBUGo
That is a fantastic video. I really thought the plane was in trouble at one point until the "pilots" ejected. Good flying and a very cool performance.