Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 63 users online :: 6 registered, 0 hidden and 57 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Engine Magnetos as Ignition Source for Combustion Cannons

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Engine Magnetos as Ignition Source for Combustion Cannons

Unread postAuthor: Jimmy K » Wed Mar 10, 2010 6:54 pm

So one of my main hobbies is rebuilding antique engines. I just bought a Wisconsin engine a couple of days ago. Now, these old Wisconsin engines were equipped with outboard mags (Fairbanks Morse) which have impulse couplings.

See this video if you don't know what I'm talking about:
http://www.youtube.com/watch?v=TpyMllc1pcM

Anyway, would rigging one of these up with a spark plug work for ignition on a cannon (Crank 1/2 turn to fire)? These routinely produce sparks of up to 3/4" in my experiences.
  • 0

User avatar
Jimmy K
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Wed Jan 20, 2010 9:17 pm
Reputation: 0

Unread postAuthor: Skywalker » Wed Mar 10, 2010 7:34 pm

I don't see why not. It'd just be kinda awkward to have to turn the crank like that to fire the cannon. I suppose you could modify it with a catch and a trigger of somekind to release the internal spring on command, instead of just letting it slip off whenever the crank is turned so far. We've kind of been over this concept before though:
http://www.spudfiles.com/forums/spark-g ... 20098.html
  • 0

User avatar
Skywalker
Sergeant Major
Sergeant Major
 
Posts: 177
Joined: Sun Aug 05, 2007 7:22 pm
Reputation: 0

Unread postAuthor: Gippeto » Wed Mar 10, 2010 7:41 pm

Bulky, awkward and on the heavy side....but an FM mag in good condition puts out one HELL of a spark. :D A far hotter spark than anything a piezo ignitor ever dreamed of putting out.

I've been bitten by more than one of these, and it'll turn your whole arm numb. 8) We used to rebuild these (and Bosch and Wiko) at work.

It'll light yer fire". :D

You could also remove the impulse, and drive it with a motor (drill) for multiple sparks.

I assume you know, but on the off chance ... Never fire it ungrounded or at a gap greater than 5/16"... you'll damage the coil.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2394
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: Jimmy K » Wed Mar 10, 2010 7:53 pm

I'm building a Howitzer style cannon mounted on a trailer. I was going to use a rope pull to pull the mag across the impulse coupling from about a 5 to 10 foot distance. So bulky and awkward have no impact in my case. I'm just looking for the most practical sparky thing Ive got. And right now its one of the dozens of mags I've got laying around haha.
  • 0

User avatar
Jimmy K
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Wed Jan 20, 2010 9:17 pm
Reputation: 0

Unread postAuthor: Zeus » Wed Mar 10, 2010 9:42 pm

Get a used disposible camera, connect the primary of the coil(assuming it ha a primary) in series with a switch, and connect that to the capacitor in the camera. (For those not well versed in the black art of disposible camera hacking, the capacitor is marked 330V 80u).
That will get inch long sparks and is far more compact.

However, if you want 4 inch long sparks, do the same thing but use two ignition coils out of phase. To connect them out of phase, just wire
the + terminal to the - terminal and do that with the other side.
The arcs will be between the output terminals.

Enjoy.
  • 0

User avatar
Zeus
Major General
Major General
 
Posts: 1422
Joined: Tue Oct 27, 2009 7:34 pm
Location: 'Straya, C*nt
Reputation: 2

Unread postAuthor: irisher » Wed Mar 10, 2010 9:53 pm

I am going to have to disagree about the inch long sparks bit. In my experiences they only produce ~ 1/8" sparks.
That will get inch long sparks and is far more compact.
  • 0

User avatar
irisher
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 420
Joined: Mon Dec 29, 2008 2:53 am
Reputation: 0

Unread postAuthor: Zeus » Wed Mar 10, 2010 10:03 pm

It depends on the capacitor, I have done a fair amount of research on the topic and 3/4 inch arcs are quite common
I will post some proof of the power of magnetos soon.
  • 0

User avatar
Zeus
Major General
Major General
 
Posts: 1422
Joined: Tue Oct 27, 2009 7:34 pm
Location: 'Straya, C*nt
Reputation: 2

Sponsored

Sponsor
 


Unread postAuthor: rcman50166 » Wed Mar 10, 2010 10:25 pm

Huh, well Ive got a really cool circuit for a motor I'm upgrading. Trouble is it's $442... Real cool, and has a pickup trigger. I can post a video of it if you would like.
  • 0

Image
User avatar
rcman50166
Colonel
Colonel
 
Posts: 697
Joined: Sat Jan 19, 2008 7:11 pm
Location: Bethel, CT
Reputation: 0

Unread postAuthor: Zeus » Thu Mar 11, 2010 1:35 am

I shall post the results of the anti-phase ignition coils in two days.
  • 0

User avatar
Zeus
Major General
Major General
 
Posts: 1422
Joined: Tue Oct 27, 2009 7:34 pm
Location: 'Straya, C*nt
Reputation: 2

Return to Combustion Cannon Discussion

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'