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Old Nov 09, 2012, 02:14 AM
AvB
Wind, hill, ... I'm keen ...
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Australia, QLD, Woody Point
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Problem with cutting back in is that with most gelcoats, only the very surface is perfectly solid and sealed. When you start cutting back into the gelcoat you expose microporosity. Unless you use a soft polishable gelcoat like SW18. Problems around every corner. If I was happy with "within 1mm" I'd keep the moulds as-is. But it's no good having the TE not closing together. New moulds needed ... somehow.
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Old Nov 09, 2012, 05:36 AM
making my own planes...
decones's Avatar
Curitiba - Brazil
Joined Oct 2007
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Andrew, about the damage moulds, you sad that you did some repairs and then sanded with 800, 1200, 2000, polish,... Didn't you sand the TE? Sometimes we focus in a specific part and don't pay attention that the sand is touching another part of the mould... Any mould edge should not be sanded, if you sand it starts to become round and when closing you will have a gap, exactly like you described....

I like your Scratcho's colour scheme based on your Shockwave hehe...
congrats!

André
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Old Nov 09, 2012, 05:37 AM
Arrarrar!
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Australia, NSW, Wagga Wagga
Joined Jan 2010
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hey Andrew, sorry to hear about your moulds! Before you chuck them, how about using a long flat sanding block and sanding the whole flange area down by however much you need to get your TE back to size. You could leave the LE flange alone and taper the flanges towards the back too. did this to the trailing edge of my full wing mould because there was originally too much material there and it worked a treat.
Cheers mate
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Old Nov 09, 2012, 05:54 AM
AvB
Wind, hill, ... I'm keen ...
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Yeah might be worth a try Josh, thanks. But I'm lusting after new fin and stab moulds now!
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Old Nov 09, 2012, 06:21 PM
Self confessed Aeroholic
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Australia, QLD, Elimbah
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Another consideration with CNC at home is the noise. Unless you're in a bunker, hour after hour of a screaming router is seriously going to annoy the neighbours.
Unless, of course, they're modellers too.
Geoff, who milled the Sniper plugs, moved to an industrial area from his back yard for that very reason.
D.
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Old Nov 09, 2012, 11:30 PM
AvB
Wind, hill, ... I'm keen ...
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Some Hobby King stuff just turned up, and I'm a bit excited about the pushrods/ snakes that I got. Must be new because I'm always on the hunt for pushrod systems and have never seen these before. Nice thin plastic tubes and springy wire rods. Just the right length for the Scratcho. I'd post a pic but the kids stole the camera!
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Old Nov 10, 2012, 02:31 PM
PB of 733kph
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Christchurch, New Zealand
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Here is some good scratcho action:

Foamies and Scratchos at Wainui (10 min 47 sec)
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Old Nov 10, 2012, 03:48 PM
AvB
Wind, hill, ... I'm keen ...
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I wanna move to Christchurch. Cheesh, Wainui 30 - 35 knots SW .... Having been there now, that's like code words for "DS Heaven". Really nice vid and love the music. Looks like it's still pretty cold up there!
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Old Nov 10, 2012, 04:12 PM
ETS....Energy retention system
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gold coast australia
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Cool vid Alex.... Great start to my day.. Good vibes.

Tim
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Old Nov 10, 2012, 05:26 PM
Arrarrar!
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Nice one Alex. Was that foamy one of your homebrews? It was super slick!
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Old Nov 10, 2012, 05:50 PM
PB of 733kph
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Christchurch, New Zealand
Joined Jul 2005
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Cheers guys! Hopefully there will be at least 6 of my foamies on the hill in Dec.

Green Foamy is a R60 Reaper. Blew up at 169mph, but video was rolling. Lost fuselage, but have made a new one. Wing was fine. This is now a dedicated light-medium wind foamy.
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Old Nov 21, 2012, 10:08 PM
Brettski
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Brisbane, Australia
Joined Apr 2007
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Pushrods...

Quote:
Originally Posted by AvB View Post
Some Hobby King stuff just turned up, and I'm a bit excited about the pushrods/ snakes that I got. Must be new because I'm always on the hunt for pushrod systems and have never seen these before. Nice thin plastic tubes and springy wire rods. Just the right length for the Scratcho. I'd post a pic but the kids stole the camera!
Andrew,

I was planning on calling you about pushrods. Do you have a HK part number? Initial thoughts?

Brettski
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Old Nov 21, 2012, 11:17 PM
AvB
Wind, hill, ... I'm keen ...
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Haven't looked at them again Brett.

I just got a message from Alex saying he's in 45 - 60mph winds at Cass Ridge right now and had the old Ampreg Scratcho fluttering and it was the fastest it's ever been. Considering it was gunned at 267 at Tekapo, and he reckoned the fast laps were missed , it sounds like it just went pretty fast. Cass seems to have a lot of power.
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Old Nov 21, 2012, 11:47 PM
Brettski
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Brisbane, Australia
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Quote:
Originally Posted by AvB View Post
Haven't looked at them again Brett.

I just got a message from Alex saying he's in 45 - 60mph winds at Cass Ridge right now and had the old Ampreg Scratcho fluttering and it was the fastest it's ever been. Considering it was gunned at 267 at Tekapo, and he reckoned the fast laps were missed , it sounds like it just went pretty fast. Cass seems to have a lot of power.
I've got a strong feeling that you'll be back in NZ bending sticks before too long....

It's a fantastic spot for any flying..

Brettski
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Old Nov 22, 2012, 12:02 AM
PB of 733kph
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Christchurch, New Zealand
Joined Jul 2005
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Probably was going 270mph odd. Cass is slightly smaller than Tekapo so would seem like it is going faster. Report in the NZ DS thread
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