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How-to: remote ignition

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Unread postAuthor: MrCrowley » Fri Nov 11, 2011 1:32 am

I'll do some research next week (if you haven't been counting down, I finish on Monday and my 3 and a half month holiday begins) and see what I can do :P
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 11, 2011 1:55 am

Brilliant :) perhaps dewey can weigh in on this one?
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Unread postAuthor: dewey-1 » Fri Nov 11, 2011 1:54 pm

jackssmirkingrevenge wrote:Brilliant :) perhaps dewey can weigh in on this one?


What do want me to weigh? :D

Let me do some research on the Receiver and Transmitter modules.
There needs to be encoding/decoding circuits as well.
Note that they are on the same frequency as the RC remote firing system.

I think a fiberglass or plastic tube would be ideal for the body so it does not reduce the transmitter range due to excess metal shielding.

JSR; see if you can locate fluorescent tube plastic containers. They maybe cheaper than fiberglass and possibly strong enough.

The nose cone would be the only metallic piece.

MrC; What is the exact bore dimension in that new barrel?
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 11, 2011 2:00 pm

dewey-1 wrote:What do want me to weigh? :D


The sanity of leaving MrC to his own devices :D

I think a fiberglass or plastic tube would be ideal for the body so it does not reduce the transmitter range due to excess metal shielding.


My thoughts exactly ;)

JSR; see if you can locate fluorescent tube plastic containers. They maybe cheaper than fiberglass and possibly strong enough.


I was thinking PVC tube would be up to the job...
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Unread postAuthor: dewey-1 » Fri Nov 11, 2011 2:08 pm

PVC is to heavy and has thick walls.
You need a thinner walled plastic tube. Even ABS thin wall would be better.
I will do some searching.
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 11, 2011 2:11 pm

dewey-1 wrote:PVC is to heavy and has thick walls.
You need a thinner walled plastic tube. Even ABS thin wall would be better.


Sectional density good :) plus it can't be too weak or it will fold on firing.

Stupid question, can a metal body be used as an aerial of sorts?
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Unread postAuthor: dewey-1 » Fri Nov 11, 2011 2:32 pm

jackssmirkingrevenge wrote:
dewey-1 wrote:PVC is to heavy and has thick walls.
You need a thinner walled plastic tube. Even ABS thin wall would be better.


Sectional density good :) plus it can't be too weak or it will fold on firing.

Stupid question, can a metal body be used as an aerial of sorts?


The sectional density would be in the nose cone.

Yes a metal body could be used if it is made for the antenna requirements.
I won't go into details yet until I complete more research on the transmitter antenna requirements.
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Unread postAuthor: MrCrowley » Sat Nov 12, 2011 1:31 am

dewey-1 wrote:MrC; What is the exact bore dimension in that new barrel?

47.8mm

As for the antenna, one could be made in to the fin section by running a wire along the thickness of each fin or the tail could be hollowed out and one of these spring like antennas used:
Image

That's just off the top of my head, I'm sure when I've done some proper research better ideas will come to light.
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 12, 2011 2:24 am

MrCrowley wrote:47.8mm


Close.

MrCrowley wrote:As for the antenna, one could be made in to the fin section by running a wire along the thickness of each fin or the tail


Brilliant idea :D

OOH OOH!

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Unread postAuthor: MrCrowley » Sat Nov 12, 2011 5:49 am

jackssmirkingrevenge wrote:
MrCrowley wrote:47.8mm


Close

I guess 47mm/1.88" would be close enough, bit of tape or even grease could make it a better fit.
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 12, 2011 6:05 am

MrCrowley wrote:I guess 47mm/1.88" would be close enough, bit of tape or even grease could make it a better fit.


Shouldn't be a problem, pusher plate doesn't have to pass over the cross slide during manufacture, and the fins will be made separately.
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Unread postAuthor: RJB INDUSTRIES » Sat Nov 12, 2011 12:24 pm

Sorry guys... Why you want apply this inside the projectile? What would it do on?
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Unread postAuthor: dewey-1 » Sat Nov 12, 2011 1:02 pm

It is a crude tracker system.
A method using a directional receiver to locate the projectile.
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Unread postAuthor: dewey-1 » Sun Nov 13, 2011 1:06 pm

Here is a complete updated schematic for you MrC.
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Unread postAuthor: MrCrowley » Sun Nov 13, 2011 1:16 pm

Thanks, I'll update it to the video, main page of this thread and instructable.

Edit: love the names you gave the components. Wish I had one of those printing label things so I could put "auto arm", "manual arm" and "master arm" on the project box :D
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