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Old Aug 15, 2014, 07:09 AM
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Australia, ACT, Canberra
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Cox .020 powered plane

Hey all,

I was just curious as to what would be the upper limits of what a Cox .020 would fly. How big a wing and how heavy could the plane be before it wouldn't fly or be a bit hairy to fly.

Cheers,

Glenn.
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Old Aug 15, 2014, 09:13 AM
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48in glider at 11oz is possible.
5oz for speed 14in to 22in wing.
7oz sport 26in to 32in wing.
Can spin a narrow width thin 2 blade -without snapping the piston rod over time.
5x2 prop
5.5x 1.5
6 x 1.2
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Old Aug 15, 2014, 03:40 PM
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Hey mate thanks for a great response. Exactly what I was after. Much appreciated.
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Old Aug 18, 2014, 10:30 PM
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Joined Apr 2014
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As a reality check, maybe check the 020 plans from Outerzone. Use the Advanced Search, putting in "RC" for Tag1, and put in "020" under keyword.
At the time of this writing, 26 plans came up.
WS ranged from 20" to 48", even a couple of twins.
I would always encourage you to push your luck and tell us how it comes out.
A few of those designs I am hoping to finish and fly before the snow flies here in NY, maybe late Nov.
Of course for you, you're probably trying to get all your planes done before the daisies pop for the Floriade Festival in a month or two...

Cheers - Poughkeepsie Pete
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Old Aug 19, 2014, 02:14 AM
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Thanks for the tip on the search.

You know I've lived in Canberra for coming on 12 years and I've not been to floriade once haha. This year we are going though.

As for getting planes built we are lucky here. We don't have down time. You can pretty much fly all year round. You just need to get used to flying in windy conditions.

My build time is at night in my shed where I have a good heater hahaha.
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Old Aug 20, 2014, 03:13 PM
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Check out this good news should happen in the next two weeks

http://www.coxengineforum.com/t7067-cox-prop-question
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Old Aug 20, 2014, 05:01 PM
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Oh nice. Thanks for that.

I was at my local yesterday to see what they had and of course there was nothing there. I need to order some from overseas so I'll order some of these when they get in stock.
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Old Aug 20, 2014, 11:42 PM
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That prop design was shaped and fine tuned to eek out real performance for the Pee Wee and really does well on the TD .020 props for the .020 are limited in selection this one is a winner on my Lil Speeder.
TD .020 3ch Lil Speedy - Flying On a Rare Cox 4x2.5 Prop (4 min 29 sec)
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Old Aug 23, 2014, 12:16 PM
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I can still see the picture in my mind of Jim Hewitt flying his Littlest Stick with an .020 on it. Funny how the antenna trailed at about a 45* angle behind the plane. It had a wing span of about 18 inches if I remember and was no speed demon for sure. This was back in the early 80's when Mini servos and mini receivers were scarce.
I still have an Ace Littlest stick and a Gmark .020 that Jim gave me for a birthday present back then. I keep thinking I should build it, with today's servos and receivers with much shorter antennas it should fly pretty well.
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Old Aug 23, 2014, 03:16 PM
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Yes think that would be the G Mark .030 humming bird?
I have never seen a .020 by GM. I sourced one on the for sale forum here a cox 4.5 x 2 or the soon to be released 4 x 2.5 would motivate the plane well. I fired the engine up in my hand as the fuel tank is easy to hold it runs well not fussy at all. Yes these days the 2.4ghrz RX have helped in so many ways.
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Old Aug 23, 2014, 04:10 PM
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I stand corrected, bad memory, it is a GMark .030 I pulled out the box and actually looked.
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Old Aug 23, 2014, 06:06 PM
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I would recommend keeping a little oil on the inside the steel components have been reported to rust over time. A owner on another forum was in shock to see so much rust after his was sitting up for some time.

When mine arrived in the mail there was a grey 4.5 x 2 cox competition prop cut down to a 4 x 2 used to bench test and break in the engine. This is my second G Mark I have a .061 they take some time to break in prior to reaching good rpm.
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Old Aug 24, 2014, 10:06 PM
KE your cub.
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in the gutter, again....
Joined Jun 2005
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Hey NOI5EY, biuld a cannonshot. Frickin' hilarious to fly, takes up about as much room as a shoebox

Here's mine.

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Old Aug 25, 2014, 03:42 AM
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That looks cool. Plans??

My little cox .020 arrived today. I just need to get a couple of props and some spare heads.
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Old Aug 25, 2014, 11:21 AM
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http://www.outerzone.co.uk/plan_details.asp?ID=1247
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