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Sep 10, 2005, 02:22 AM
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How to drill out GWS HD Props to fit MP jet collet adapters

Is there a trick to drilling or widening the opening of the GWS HD props so that the adapter fits properly, any specific drill sizes, or instructions would be appreciated. Thanks RMac
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Sep 10, 2005, 10:20 AM
Registered User
Dr Kiwi's Avatar
You can use a prop reamer, but I've never had one of those. I simply use as many imperial drill sizes as I can, as intermediaries before using the 5mm or 6mm metric drill bit to get the final hole.

3mm and 3.2mm MP Jet adapters need 5mm bore, 4mm need 6mm bore, 5mm need a stepped 7-8mm........

To get from the original 4mm bore GWS HD hub to 5mm bore: use
(first)11/64 = 4.3656mm
(then) 3/16 = 4.7625mm
(finally) 5mm

To continue to 6mm: use
(first) 13/64 = 5.1594mm
(then) 7/32 = 5.5562mm
(then) 15/64 = 5.9531mm
(finally) 6mm

Cheers, Phil
Sep 10, 2005, 12:30 PM
Registered User
Phil, can I use a hand drill or should I track someone down who has a drill press. Thanks for the info RMac
Sep 10, 2005, 01:15 PM
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Dr Kiwi's Avatar
Originally Posted by RMac
Phil, can I use a hand drill or should I track someone down who has a drill press. Thanks for the info RMac
I sometimes use my drill press, but usually I'm in a hurry so I put the prop hub in a vise and just hand-hold my cordless 14.4v Makita power drill on high speed. I don't imagine you could do it well with a real old-fashioned "hand drill", since the bit will "bite" even at low rpm on the power drill, let alone the minimal rpm of a hand drill.

Cheers, Phil
Sep 10, 2005, 05:31 PM
Team30 Micro EDF
NitroCharged's Avatar
I actually do use a hand-drill when I am in the field. I get a flying buddy to hold the prop flat against my van floor and go for it (but turning it slowly). Once it bites to the bottom I hand spin the prop down onto the drill bit to finish the hole off.
Sep 11, 2005, 01:50 AM
Registered User
My mistake Dr Kiwi & NC, I meant a cordless electric drill. I was able to find a tapered round file and used that to enlarge the opening, prop adapter fits well. I am eager to try these new props out as I have been using APC slow fly's and have heard that the HD can draw less Amps and provide similiar thrust.Also added a Watt's up to the flight box. Great info as usual. Thanks RMac
Sep 11, 2005, 08:58 AM
Designer of Flying Things
-=SLaPPiE=-'s Avatar
An electricians step bit, with only one cutting edge is what I use.

Sep 11, 2005, 09:31 AM
Registered User
John O'Sullivan's Avatar
If you don't have a proper reamer readily available, the tang of a suitably sized file does a good job.
John O'Sullivan

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