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E firewall for Bravo

Old 05-14-2011, 06:43 AM
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bondtasha
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Default E firewall for Bravo

Does anyone by chance have a template for a firewall for the Wistmodel / Lorenz Bravo.

What method are you guys using to get the shape of the firewall and what material and glue are you using

Thanks
Old 05-14-2011, 11:18 AM
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f3a05
 
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Default RE: E firewall for Bravo

Hi Chris, this is the way I do it, to mount the rear of an out runner to a firewall:

1/ Attach the spinner backplate to the motor’s prop driver.
2/With 1/161/8th spacers between the backplate and the fus.nose, tape the backplate and motor securely in place.
3/ Cut a small square of liteply, just big enough to carry whatever fixings (eg bolts) you will be using to fix the motor to the firewall, and fix it to the back of the motor.
4/ cyano multiple 1/8 or so balsa sticks to the liteply square, with each stick radiating out to touch the fus sides.

You’ll end up with something like this:


Uploaded with ImageShack.us

5/Remove the porcupine,draw round the edge,and produce a liteply firewall template., to check the fit to the fus, fixing points, &c.

For the actual firewall, I use two layers of 1/8 liteply, with the outer ply grains at 90 degrees to each other, skinned with 200 gram/sq.metre carbon or glass cloth front and back, all fixed under pressure(I use g-clamps, melamine-faced chipboard, with black polythene bin-liner separating film),using wing-skinning epoxy.
I glue the firewall in,bolted up to the back of the motor, with 24-hour araldite, reinforced with beads of 30-minute epoxy/micro balloons around the margins,front and back faces.

Here(shades of Blue Peter) is one I made earlier:



Uploaded with ImageShack.us
Old 05-14-2011, 08:44 PM
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DaveL322
 
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Default RE: E firewall for Bravo

What motor are you planning to mount? I might have a template for Neu F3A w/ Hyde softmount.

Regards,
Old 05-14-2011, 08:58 PM
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Ryan Smith
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Default RE: E firewall for Bravo


ORIGINAL: f3a05

Hi Chris, this is the way I do it, to mount the rear of an out runner to a firewall:

1/ Attach the spinner backplate to the motor’s prop driver.
2/With 1/161/8th spacers between the backplate and the fus.nose, tape the backplate and motor securely in place.
3/ Cut a small square of liteply, just big enough to carry whatever fixings (eg bolts) you will be using to fix the motor to the firewall, and fix it to the back of the motor.
4/ cyano multiple 1/8 or so balsa sticks to the liteply square, with each stick radiating out to touch the fus sides.

You’ll end up with something like this:


Uploaded with ImageShack.us

5/Remove the porcupine,draw round the edge,and produce a liteply firewall template., to check the fit to the fus, fixing points, &c.

For the actual firewall, I use two layers of 1/8 liteply, with the outer ply grains at 90 degrees to each other, skinned with 200 gram/sq.metre carbon or glass cloth front and back, all fixed under pressure(I use g-clamps, melamine-faced chipboard, with black polythene bin-liner separating film),using wing-skinning epoxy.
I glue the firewall in,bolted up to the back of the motor, with 24-hour araldite, reinforced with beads of 30-minute epoxy/micro balloons around the margins,front and back faces.

Here(shades of Blue Peter) is one I made earlier:



Uploaded with ImageShack.us
Excellent method to determine firewall shape! I'll have to use that in the future, seems to be very simple and can get you in the ballpark very quickly!

Thanks for sharing, I'll have to try that on my next build.
Old 05-14-2011, 11:05 PM
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bondtasha
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Default RE: E firewall for Bravo

Thank you Alan,

The motor will be the Himax which will as far as I can see only mount via a firewall

Really pleased with the Bravo quality so far
Old 09-29-2011, 09:32 PM
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Andy P.
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Default RE: E firewall for Bravo

Hey Chris,

How about a photo or two of the firewal install? Have you tried out the Himax yet??
Old 10-01-2011, 04:21 AM
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bondtasha
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Default RE: E firewall for Bravo

As requested sir

Not yet spun the Himax but the fus now fully fretted out where needed and carbon horns on order

I have also ordered more carbon kevlar for the battery tray. Peally got the laminating bug now

Pity there is not more about this ship on here.
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Old 10-01-2011, 11:43 PM
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Andy P.
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Default RE: E firewall for Bravo

Nice work mate!

That firewall looks like the 'scream' mask

You should have said, I've got more CK cloth here you could have had

As an aside, the Twister is going in to primer (maybe today), got all the prep done last sunday in the club workshop so should be ready in around a week [X(]..............or two .

No joy with the masks yet though, seems our northern brother has gone to ground [&o]

Drop me a text if you need owt...............

Andy.
Old 10-02-2011, 05:12 AM
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Default RE: E firewall for Bravo

I have been using Hysol 9642 to glue the firewall to the fuse. The stuff probably is much stronger than regular epoxy.

I like f3a05's "stick method" to get the shape of the template quickly. Excellent.
Old 11-21-2011, 01:21 PM
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Shahid
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Default RE: E firewall for Bravo

Hello Chris, good to see you on here (and Alan "legend" Wild too)

I will be sticking a Plettenberg in my Bravo, my issue is removal of the motor for maintenance and what not. I like Alans method, but think I'll make a lip, say 15-20mm deep, which the actual firewall will then bolt onto, that way you can pop yer motor in and out with ease. Any thoughts?
Old 11-21-2011, 02:43 PM
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bondtasha
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Default RE: E firewall for Bravo

Hi Shahid,

It is never going to be easy to remove the firewall backwards with the motor on an get it past the undercarriage mount ( which is by the way beautiful engineering) The Himax is 63mm diameter and with the nose fretted out there is plenty of room to remove the motor from the 83mm nose.
Nose fretted out with diamond burr to about 65mm

C
Old 11-23-2011, 04:46 PM
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Shahid
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Default RE: E firewall for Bravo

The Plett is 60mm diameter so you might just have a point!

Such a shame to fret the nose out, but Hacker is not for me [8D]
Old 11-26-2011, 09:12 AM
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bondtasha
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Default RE: E firewall for Bravo

not a problem with neat work -not by me but a certain AndyP
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