Spade Grip Fire Button Drawings???

Read the forum code of contact

Member for

13 years

Posts: 140

Does anyone have drawings for the fire button from a Dunlop spade grip? Mine was converted to an electric button for use in a Harvard and I'd like to convert it back to an operational pneumatic button.

Thanks,

Ron

Original post

Member for

13 years

Posts: 140

Its for my Hurricane grip so the round type button. Below is a picture showing the electrical wiring exiting the brass bass.

 photo 11960f_zpsycxosoql.jpg

What I'm looking for are drawings to machine a new brass bass and attached brass tubing for the pneumatic system. So in the picture below, it's the item on the left for which I need a drawing.

 photo IMG_5808_zpsemqkaxng.jpg

Member for

17 years 6 months

Posts: 9,739

There is a group that were at the Brenzett / Shoreham Aerojumbles that manufactures replica firing-buttons of this type. I don't remember if they were pneumatic or electric but presumably they must have drawings to manufacture these.

Maybe somebody here can put you in touch with this group?

Member for

13 years

Posts: 140

Does anyone know how to remove the firing button assembly from the spade grip?

Member for

17 years 6 months

Posts: 9,739

It is probably a simple press-fit?

Incidentally, forum member Tangmere1940, as long-time organiser of the Shoreham Aerojumble, will probably be able to put you in touch with the group producing replica spade-grips and firing-buttons...

...if his private-message in-box isn't full (as it usually is)!

Member for

13 years

Posts: 140

I actually have a replica button assembly but oddly is too large to fit the spade grip. And I'd really like to use as many of the original parts as possible.

Now that I've take the assembly apart it turns out that I require items 6, 9, and 10 to restore the assembly back to its original pneumatic system. I'm hoping someone has "spares" or drawings that I can use to make the replacement parts. Even photographs of these parts would be helpful.

Many thanks everyone for your feedback.

Cheers!

 photo Spade Grip AP-1641_zpssh6wohzo.jpg

Member for

17 years 6 months

Posts: 9,739

My hope was that the group producing the 'replica' firing-buttons had done so from original drawings and so the parts would be interchangeable with original parts (and they would have copies of the original drawings)...

...maybe they simply produced good 'looky-likey' firing-buttons?

I suppose the danger with faithful replicas is somebody passing them off as originals.

Member for

13 years

Posts: 140

Update
I've been able to borrow and complete Hurricane Grip from another project team. And using the fire button assembly from that grip I've able to determine the dimensions I require with one exception. That dimension is the threads for the air valve that screws in to the valve body with the inlet pipes. Or even better, does anyone know the model number of the original air valve or a replacement valve?

I'm happy to share the drawings when I'm finished with the understanding that they are not for an airworthy project.

Thanks,

Ron

Member for

17 years 2 months

Posts: 248

Update
I've been able to borrow and complete Hurricane Grip from another project team.....
I'm happy to share the drawings when I'm finished with the understanding that they are not for an airworthy project......

Any chance of a picture?

Member for

13 years

Posts: 140

Any chance of a picture?

Of the borrowed grip or the grip that I'm restoring?

Member for

17 years 11 months

Posts: 2,605

The valve is a standard Schrader valve I believe.

Member for

13 years

Posts: 140

Below is a picture of the valve body with the valve in place. The head of the valve looks larger than any standard valve I've seen. Maybe the head is modified.

 photo IMG_0836_zps00tvqr92.jpg

Member for

13 years

Posts: 140

Anymore thoughts on the make and model of the valve now that I've posted a picture?

Thanks,

Ron

Member for

11 years 9 months

Posts: 146

Anymore thoughts on the make and model of the valve now that I've posted a picture?

Thanks,

Ron

Sorry I can't help with size or type but would it be possible for you to take the one in the photo out and measure it up?

Member for

11 years 9 months

Posts: 146

[ATTACH=CONFIG]237310[/ATTACH]

Hope this might help

Attachments

Member for

13 years

Posts: 140

Sorry I can't help with size or type but would it be possible for you to take the one in the photo out and measure it up?

I tried but the valve won't budge. :(

Member for

13 years

Posts: 140

Great picture, Cornovii! Thank you. What document is this page from?

Member for

11 years 9 months

Posts: 146

[ATTACH=CONFIG]237331[/ATTACH]

Goes under Air Ministry on here. He might have a copy to purchase.

Attachments

Member for

13 years

Posts: 140

Thank you again :)

Cheers

Member for

17 years 2 months

Posts: 248

Goes under "Air Ministry "on here. He might have a copy to purchase.
interesting, thanks for sharing.