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Forum: "1/2 A" & "1/8 A" airplanes

04-14-2019, 08:28 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

Are the dimensions-as per the notebook sketch-the...

Are the dimensions-as per the notebook sketch-the final ones you used in terms of spigot depth, bowl depth and squish band? And what size ball mill did you use? [I have a range of ball mills -plus...

Forum: "1/2 A" & "1/8 A" airplanes

04-14-2019, 03:18 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

Well done that man-you're nicely confirming Mike...

Well done that man-you're nicely confirming Mike Billington's prediction that 'there was potentially more power to be extracted from the basic design. I hope Greg Kamysc will be persuaded to offer...

Forum: "1/2 A" & "1/8 A" airplanes

04-14-2019, 01:21 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

Great effort-especially with your limited tool...

Great effort-especially with your limited tool range. Looks the part and no doubt will serve the purpose admirably.

ChrisM
'ffkiwi'

Forum: "1/2 A" & "1/8 A" airplanes

04-04-2019, 08:57 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

Great work pondskipper-you might well find a lot...

Great work pondskipper-you might well find a lot of takers for those turbo heads and backplates if you intend going into production-I'd certainly take several-I forget how many 03s I have...4 or 5 as...

Forum: "1/2 A" & "1/8 A" airplanes

04-04-2019, 10:54 AM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

Quite right-but I suspect Pondskipper is...

Quite right-but I suspect Pondskipper is referring to the .03 G-Mark.....but a 1K increase in either of them is a respectable goal and if achieved puts both of them right into TD territory.....which...

Forum: "1/2 A" & "1/8 A" airplanes

03-20-2019, 12:10 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

well counterbores only go down to 3mm screw size...

well counterbores only go down to 3mm screw size generally in any case....in your situation the only option I'd suggest is using an endmill or slot drill to open out the screw hole to partial depth...

Forum: "1/2 A" & "1/8 A" airplanes

02-09-2019, 10:59 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

No reason at all why that ''diet version'...

No reason at all why that ''diet version' approach wouldn't work-I'd try and use some aerospace grade alloy sheet for if I were you though-.....I've just measured up a backplate screw-I make it about...

Forum: "1/2 A" & "1/8 A" airplanes

02-09-2019, 05:28 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

G-Mark 061

I wouldn't bother-the weight loss is minimal and it seriously devalues the engine should you at some future time decide to get rid of it. Personally I find the beam mounts useful for anchoring things...

Forum: "1/2 A" & "1/8 A" airplanes

02-07-2019, 12:59 AM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

OK here it is-very rough. The material is 2mm...

OK here it is-very rough. The material is 2mm thick alloy-the centre hole is 10mm diameter, and the inner 3 holes in a triangle match the backplate mounting screw location. The mount has been stamped...

Forum: "1/2 A" & "1/8 A" airplanes

02-06-2019, 09:11 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

I suggest you try a 4-40 pressure tap-you will...

I suggest you try a 4-40 pressure tap-you will probably find them on one of the cl stunt or cl racing websites. People like Joe Klause of Kustom Kraftsmanship and Fox used to manufacture them as...

Forum: "1/2 A" & "1/8 A" airplanes

03-17-2018, 11:20 PM

Replies: 54

G-mark .061 prop question

Views: 9,046

Posted By ffkiwi

Actually the G-Mark prop screw is 3mm metric:...

Actually the G-Mark prop screw is 3mm metric: M3x0.5 which makes it a bit smaller than the Cox 049 prop screw which is 5-40 thread-and 1/8" diameter. There are plastic bushings available from APC...

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