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Old May 07, 2003, 03:01 AM
KayCee
Guest
n/a Posts
Catapult Launcher plans?

I'm having problems getting enough airspeed by slinging my electric planes,
wings and EDF jets. I think it's time to build a launcher. Anyone have
plans for a catapult for launching small electrics....or maybe a web site?
Thanks-
--
KayCee
Foamie Kit-Basher


Old May 07, 2003, 03:01 AM
A.T.
Guest
n/a Posts
Re: Catapult Launcher plans?

refer to = http://homepages.ihug.co.nz/~atong/
and scroll down to "Catapults, Bungees & Winches"
and in need email me direct for further instructions etc
regards
Alan T.
Alan's Hobby Web Links
http://homepages.ihug.co.nz/~atong/
.................................................. .............

"KayCee" <k.o.cornelius@worldnet.att.net> wrote in message
newsdZta.142367$ja4.6580214@bgtnsc05-news.ops.worldnet.att.net...
> I'm having problems getting enough airspeed by slinging my electric

planes,
> wings and EDF jets. I think it's time to build a launcher. Anyone have
> plans for a catapult for launching small electrics....or maybe a web site?
> Thanks-
> --
> KayCee
> Foamie Kit-Basher
>
>



Old May 08, 2003, 03:00 AM
Mathew Kirsch
Guest
n/a Posts
Re: Catapult Launcher plans?

"KayCee" <k.o.cornelius@worldnet.att.net> wrote in message news:<odZta.142367$ja4.6580214@bgtnsc05-news.ops.worldnet.att.net>...
> I'm having problems getting enough airspeed by slinging my electric planes,
> wings and EDF jets. I think it's time to build a launcher. Anyone have
> plans for a catapult for launching small electrics....or maybe a web site?


I have been looking for catapult plans for years, and I have yet to
find a so-called "plan" that included enough information to build a
catapult. For the most part, all you get are a few grainy photographs
of the catapult from a distance, and a vague description of how it was
constructed...

A simple bungee launcher can be made with a length of surgical tubing
and a tent spike. Problem is, there is no scientific way to figure out
exactly how much force you need to put into a plane to launch it. Not
enough, you crash. Too much, you crash...

Some discussion on bungee launchers takes place in the discussion
groups at http://www.ezonemag.com
Old May 08, 2003, 03:00 AM
The Natural Philosopher
Guest
n/a Posts
Re: Catapult Launcher plans?

Abel Pranger wrote:

> "KayCee" <k.o.cornelius@worldnet.att.net> wrote in message news:<odZta.142367$ja4.6580214@bgtnsc05-news.ops.worldnet.att.net>...
>
>>I'm having problems getting enough airspeed by slinging my electric planes,
>>wings and EDF jets. I think it's time to build a launcher. Anyone have
>>plans for a catapult for launching small electrics....or maybe a web site?
>>

>
> KayCee-
>
> S&E Modeler has just the plans you are looking for, and a couple of
> choices to boot. /
>
> Abel
>


Here is a link to a kit that needs a bungee launcher:
http://www.rbckits.com/id67.htm Both the type of rubber, its length and
the pull are specified.

They also sell a bungee launch kit, but they are in the Netherlands
which you probably are not...


All a bungee is, is some rubber VERY firmly DOUBLE staked in the ground
- and this IS imporetant because tent pegs or metal stakes pulluing out
under 10-50lb tension can take an eye out or even kill you on an
abdominal strike - and a ramp the plabne can slide along - typically
made out of plastic plumbing pipe - and a method of releaseing the plane
- usually with a foot pedal that pulls a pin out of whatever holds the
bungee taut.

Best way to optimse tension is to buld a sheet balsa glider 'thing'
approximately the same weight and size as the plane you are going to
fly. Once you can launch that, pull riound and dead stick it at your
feet, your launcher works I guess :-)

*thinks* Nice project for some scrap and a pair of old servos actually :-)

Old May 08, 2003, 03:00 AM
Normen Strobel
Guest
n/a Posts
Re: Catapult Launcher plans?

It's real simple to build one out of PVC pipe and some elbows. Doesn't need
to be a specific size or at a specific angle to work. It will probably cost
you under 5 bucks to build. I put up a couple of pictures of the one I
built for my T33 electric ducted fan on alt.binaries.radio-control



"Mathew Kirsch" <mkirsch1@rochester.rr.com> wrote in message
news:d6bf3430.0305070404.4c0a02c0@posting.google.c om...
> "KayCee" <k.o.cornelius@worldnet.att.net> wrote in message

news:<odZta.142367$ja4.6580214@bgtnsc05-news.ops.worldnet.att.net>...
> > I'm having problems getting enough airspeed by slinging my electric

planes,
> > wings and EDF jets. I think it's time to build a launcher. Anyone have
> > plans for a catapult for launching small electrics....or maybe a web

site?
>
> I have been looking for catapult plans for years, and I have yet to
> find a so-called "plan" that included enough information to build a
> catapult. For the most part, all you get are a few grainy photographs
> of the catapult from a distance, and a vague description of how it was
> constructed...
>
> A simple bungee launcher can be made with a length of surgical tubing
> and a tent spike. Problem is, there is no scientific way to figure out
> exactly how much force you need to put into a plane to launch it. Not
> enough, you crash. Too much, you crash...
>
> Some discussion on bungee launchers takes place in the discussion
> groups at http://www.ezonemag.com





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Old May 09, 2003, 03:01 AM
Final Reproach
Guest
n/a Posts
Re: Catapult Launcher plans?

Hey Norman,
A few questions, if I may...
How long and what size is the surgical tubing?
Also, looks like the leader is real short. How short?
Can you guess how fast the plane is going as it leaves the rails?

I, like a few others, am trying to build one, any advise would be
greatly appreciated.

Thanks,

--
John Krueger AMA 572030

I think I can save it!




"Normen Strobel" <nstrobel@nospam.zoominternet.net> wrote in message
news:3eb9b938_6@corp.newsgroups.com...
> It's real simple to build one out of PVC pipe and some elbows. Doesn't

need
> to be a specific size or at a specific angle to work. It will probably

cost
> you under 5 bucks to build. I put up a couple of pictures of the one I
> built for my T33 electric ducted fan on alt.binaries.radio-control
>
>
>
> "Mathew Kirsch" <mkirsch1@rochester.rr.com> wrote in message
> news:d6bf3430.0305070404.4c0a02c0@posting.google.c om...
> > "KayCee" <k.o.cornelius@worldnet.att.net> wrote in message

> news:<odZta.142367$ja4.6580214@bgtnsc05-news.ops.worldnet.att.net>...
> > > I'm having problems getting enough airspeed by slinging my electric

> planes,
> > > wings and EDF jets. I think it's time to build a launcher. Anyone

have
> > > plans for a catapult for launching small electrics....or maybe a web

> site?
> >
> > I have been looking for catapult plans for years, and I have yet to
> > find a so-called "plan" that included enough information to build a
> > catapult. For the most part, all you get are a few grainy photographs
> > of the catapult from a distance, and a vague description of how it was
> > constructed...
> >
> > A simple bungee launcher can be made with a length of surgical tubing
> > and a tent spike. Problem is, there is no scientific way to figure out
> > exactly how much force you need to put into a plane to launch it. Not
> > enough, you crash. Too much, you crash...
> >
> > Some discussion on bungee launchers takes place in the discussion
> > groups at http://www.ezonemag.com

>
>
>
>
> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----== Over 80,000 Newsgroups - 16 Different Servers! =-----



Old May 10, 2003, 03:00 AM
Normen Strobel
Guest
n/a Posts
Re: Catapult Launcher plans?

It's 30ft of tubing and 6 ft of leader. You can use a longer leader, if
you want it to gain more altitude. Not sure the thickness, standard high
start stuff. The T33 was able to be hand launched, it was just squirrly for
the first couple of seconds, so really all I wanted was a catapult that
would give it a good burst of speed. I'm guessing 20-30MPH. It went so
fast I would always forget to turn on the motor after the high start
released. I have a video I can email you but it's about 3.5MB Let me know
if you want me to email it to you.

It was a real blast the first day, I would take off, fly a lap around the
field and land it right next to the catapult. By then the guys had the
catapult rigged up again, and I took off again. We did this about 20 times
before the batteries in the T33 drained.


"Final Reproach" <thelorax@wi.rr.com> wrote in message
news:NtDua.10908$JE3.654473@twister.rdc-kc.rr.com...
> Hey Norman,
> A few questions, if I may...
> How long and what size is the surgical tubing?
> Also, looks like the leader is real short. How short?
> Can you guess how fast the plane is going as it leaves the rails?
>
> I, like a few others, am trying to build one, any advise would be
> greatly appreciated.
>
> Thanks,
>
> --
> John Krueger AMA 572030
>
> I think I can save it!
>
>
>
>
> "Normen Strobel" <nstrobel@nospam.zoominternet.net> wrote in message
> news:3eb9b938_6@corp.newsgroups.com...
> > It's real simple to build one out of PVC pipe and some elbows. Doesn't

> need
> > to be a specific size or at a specific angle to work. It will probably

> cost
> > you under 5 bucks to build. I put up a couple of pictures of the one I
> > built for my T33 electric ducted fan on alt.binaries.radio-control
> >
> >
> >
> > "Mathew Kirsch" <mkirsch1@rochester.rr.com> wrote in message
> > news:d6bf3430.0305070404.4c0a02c0@posting.google.c om...
> > > "KayCee" <k.o.cornelius@worldnet.att.net> wrote in message

> > news:<odZta.142367$ja4.6580214@bgtnsc05-news.ops.worldnet.att.net>...
> > > > I'm having problems getting enough airspeed by slinging my electric

> > planes,
> > > > wings and EDF jets. I think it's time to build a launcher. Anyone

> have
> > > > plans for a catapult for launching small electrics....or maybe a web

> > site?
> > >
> > > I have been looking for catapult plans for years, and I have yet to
> > > find a so-called "plan" that included enough information to build a
> > > catapult. For the most part, all you get are a few grainy photographs
> > > of the catapult from a distance, and a vague description of how it was
> > > constructed...
> > >
> > > A simple bungee launcher can be made with a length of surgical tubing
> > > and a tent spike. Problem is, there is no scientific way to figure out
> > > exactly how much force you need to put into a plane to launch it. Not
> > > enough, you crash. Too much, you crash...
> > >
> > > Some discussion on bungee launchers takes place in the discussion
> > > groups at http://www.ezonemag.com

> >
> >
> >
> >
> > -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> > http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> > -----== Over 80,000 Newsgroups - 16 Different Servers! =-----

>
>





-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 80,000 Newsgroups - 16 Different Servers! =-----
Old May 10, 2003, 03:00 AM
Final Reproach
Guest
n/a Posts
Re: Catapult Launcher plans?

Norman,
That would be great!
Please E-mail it to the reply address listed.
(It is legit, and I have a giant mailbox).
Thanks.

--
John Krueger AMA 572030

I think I can save it!




"Normen Strobel" <nstrobel@nospam.zoominternet.net> wrote in message
news:3ebb9e59$1_6@corp.newsgroups.com...
> It's 30ft of tubing and 6 ft of leader. You can use a longer leader, if
> you want it to gain more altitude. Not sure the thickness, standard high
> start stuff. The T33 was able to be hand launched, it was just squirrly

for
> the first couple of seconds, so really all I wanted was a catapult that
> would give it a good burst of speed. I'm guessing 20-30MPH. It went so
> fast I would always forget to turn on the motor after the high start
> released. I have a video I can email you but it's about 3.5MB Let me

know
> if you want me to email it to you.
>
> It was a real blast the first day, I would take off, fly a lap around the
> field and land it right next to the catapult. By then the guys had the
> catapult rigged up again, and I took off again. We did this about 20

times
> before the batteries in the T33 drained.
>
>
> "Final Reproach" <thelorax@wi.rr.com> wrote in message
> news:NtDua.10908$JE3.654473@twister.rdc-kc.rr.com...
> > Hey Norman,
> > A few questions, if I may...
> > How long and what size is the surgical tubing?
> > Also, looks like the leader is real short. How short?
> > Can you guess how fast the plane is going as it leaves the rails?
> >
> > I, like a few others, am trying to build one, any advise would be
> > greatly appreciated.
> >
> > Thanks,
> >
> > --
> > John Krueger AMA 572030
> >
> > I think I can save it!
> >
> >
> >
> >
> > "Normen Strobel" <nstrobel@nospam.zoominternet.net> wrote in message
> > news:3eb9b938_6@corp.newsgroups.com...
> > > It's real simple to build one out of PVC pipe and some elbows.

Doesn't
> > need
> > > to be a specific size or at a specific angle to work. It will

probably
> > cost
> > > you under 5 bucks to build. I put up a couple of pictures of the one

I
> > > built for my T33 electric ducted fan on alt.binaries.radio-control
> > >
> > >
> > >
> > > "Mathew Kirsch" <mkirsch1@rochester.rr.com> wrote in message
> > > news:d6bf3430.0305070404.4c0a02c0@posting.google.c om...
> > > > "KayCee" <k.o.cornelius@worldnet.att.net> wrote in message
> > > news:<odZta.142367$ja4.6580214@bgtnsc05-news.ops.worldnet.att.net>...
> > > > > I'm having problems getting enough airspeed by slinging my

electric
> > > planes,
> > > > > wings and EDF jets. I think it's time to build a launcher.

Anyone
> > have
> > > > > plans for a catapult for launching small electrics....or maybe a

web
> > > site?
> > > >
> > > > I have been looking for catapult plans for years, and I have yet to
> > > > find a so-called "plan" that included enough information to build a
> > > > catapult. For the most part, all you get are a few grainy

photographs
> > > > of the catapult from a distance, and a vague description of how it

was
> > > > constructed...
> > > >
> > > > A simple bungee launcher can be made with a length of surgical

tubing
> > > > and a tent spike. Problem is, there is no scientific way to figure

out
> > > > exactly how much force you need to put into a plane to launch it.

Not
> > > > enough, you crash. Too much, you crash...
> > > >
> > > > Some discussion on bungee launchers takes place in the discussion
> > > > groups at http://www.ezonemag.com
> > >
> > >
> > >
> > >
> > > -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> > > http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> > > -----== Over 80,000 Newsgroups - 16 Different Servers! =-----

> >
> >

>
>
>
>
> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----== Over 80,000 Newsgroups - 16 Different Servers! =-----



Old May 11, 2003, 03:00 AM
The Natural Philosopher
Guest
n/a Posts
Re: Catapult Launcher plans?

Normen Strobel wrote:

> It's 30ft of tubing and 6 ft of leader. You can use a longer leader, if
> you want it to gain more altitude. Not sure the thickness, standard high
> start stuff. The T33 was able to be hand launched, it was just squirrly for
> the first couple of seconds, so really all I wanted was a catapult that
> would give it a good burst of speed. I'm guessing 20-30MPH. It went so
> fast I would always forget to turn on the motor after the high start
> released. I have a video I can email you but it's about 3.5MB Let me know
> if you want me to email it to you.



That sounds about right. Hand launch will easily get you to about
18-20mph: If thats below stall speed you are in deep trouble, and even
if its above, and thrust is poor, it takes a long straight level flight
before you dare lift the nose or try to turn.

Bunnee launchers for electric jets and other small fast models are not
there to gain height per se, they are there to gain flying speed.

Obviosly you can trade speed for height, using the elevator :-)

Typically about 30mph is enough to get all but the most high wing
loading models into decent flying trim.


>
> It was a real blast the first day, I would take off, fly a lap around the
> field and land it right next to the catapult. By then the guys had the
> catapult rigged up again, and I took off again. We did this about 20 times
> before the batteries in the T33 drained.
>
>
> "Final Reproach" <thelorax@wi.rr.com> wrote in message
> news:NtDua.10908$JE3.654473@twister.rdc-kc.rr.com...
>
>>Hey Norman,
>>A few questions, if I may...
>>How long and what size is the surgical tubing?
>>Also, looks like the leader is real short. How short?
>>Can you guess how fast the plane is going as it leaves the rails?
>>
>>I, like a few others, am trying to build one, any advise would be
>>greatly appreciated.
>>
>>Thanks,
>>
>>--
>>John Krueger AMA 572030
>>
>>I think I can save it!
>>
>>
>>
>>
>>"Normen Strobel" <nstrobel@nospam.zoominternet.net> wrote in message
>>news:3eb9b938_6@corp.newsgroups.com...
>>
>>>It's real simple to build one out of PVC pipe and some elbows. Doesn't
>>>

>>need
>>
>>>to be a specific size or at a specific angle to work. It will probably
>>>

>>cost
>>
>>>you under 5 bucks to build. I put up a couple of pictures of the one I
>>>built for my T33 electric ducted fan on alt.binaries.radio-control
>>>
>>>
>>>
>>>"Mathew Kirsch" <mkirsch1@rochester.rr.com> wrote in message
>>>news:d6bf3430.0305070404.4c0a02c0@posting.googl e.com...
>>>
>>>>"KayCee" <k.o.cornelius@worldnet.att.net> wrote in message
>>>>
>>>news:<odZta.142367$ja4.6580214@bgtnsc05-news.ops.worldnet.att.net>...
>>>
>>>>>I'm having problems getting enough airspeed by slinging my electric
>>>>>
>>>planes,
>>>
>>>>>wings and EDF jets. I think it's time to build a launcher. Anyone
>>>>>

>>have
>>
>>>>>plans for a catapult for launching small electrics....or maybe a web
>>>>>
>>>site?
>>>
>>>>I have been looking for catapult plans for years, and I have yet to
>>>>find a so-called "plan" that included enough information to build a
>>>>catapult. For the most part, all you get are a few grainy photographs
>>>>of the catapult from a distance, and a vague description of how it was
>>>>constructed...
>>>>
>>>>A simple bungee launcher can be made with a length of surgical tubing
>>>>and a tent spike. Problem is, there is no scientific way to figure out
>>>>exactly how much force you need to put into a plane to launch it. Not
>>>>enough, you crash. Too much, you crash...
>>>>
>>>>Some discussion on bungee launchers takes place in the discussion
>>>>groups at http://www.ezonemag.com
>>>>
>>>
>>>
>>>
>>>-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
>>>http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
>>>-----== Over 80,000 Newsgroups - 16 Different Servers! =-----
>>>

>>

>
>
>
>
> -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
> http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
> -----== Over 80,000 Newsgroups - 16 Different Servers! =-----
>



 


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