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Old Feb 18, 2014, 10:56 PM
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Mercury Cobra

Just finished my scratch built Mercury Cobra.

It has an increased wingspan of 42inches (extra 2inch rib bay on the inside wing)

Adjustable leadouts, carbon fibre pushrod with adjustable metal clevis at the elevator.

Engine is an older Thunder Tiger 25 modified with a Enya 19 delrin venturi and a OS 20/25fp needle valve. Top Flite 9x4 wooden propeller to begin, modify as needed.

The engine has good compression so it should run well. >fingers crossed<

Home made metal fuel tank, approx 3oz capacity.

Rattle can purple paint with Nitro fuel proof clear over top. White plastic film on top wing covering, blue and white check film on the bottom.

Hand crafted "Cobra" decal.

Weight is 29oz which I am very happy with!!

Az
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Old Feb 19, 2014, 10:18 AM
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Nice plane looks like it should fly very well
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Old Jul 31, 2015, 11:30 PM
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I was just looking for pics of this model and found yours, looks great! I am about to build one and am interested in how it went in the air with a 25 bolted on?

Cheers

Col
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Old Aug 01, 2015, 05:55 AM
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Azryl, that came out very well. At 29oz it should fly sweet.

When's the big test flight? If your weather is like up the road here you could be waiting a week.

* Danny M *
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Old Aug 01, 2015, 07:49 AM
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Given the date of the photos and original post, there was plenty of time to fly it over two years ago before weather made things unpleasant (it was April, when does winter close things down where he is, anyway?)
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Old Aug 01, 2015, 08:39 PM
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Oops - I never looked at the date.

I live not far from Azryl (90 minutes) - nights have been 0C or below, days only in single digits and cold rain and wind for the next week. I can see the snow in the mountains.

Anyway, it would be nice to hear how the model flew.

* Danny M *
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Old Aug 01, 2015, 09:10 PM
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I'm not very familiar with metric temps. I know zero is freezing = 32 F. Here, we hit 100 F for the first two times yesterday and today . . we've actually had a mild summer until now.

P. S. I was only six months old when I left NZ, and despite my earnest wishes, never could afford a vacation visit back there.


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Old Aug 02, 2015, 04:49 AM
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Ack.. sorry guys... I missed updating this thread

It *DID* fly very well... until the elevator clevis broke in flight
airplane hit ground.... the ground won!

I will rebuild it some time, first I will need to dig the dirt/grass out of the engine and clean it

Was nice to fly... taught me inverted flight and horizontal eights

Az


P.S I have been flying every week since this original post
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Old Aug 03, 2015, 01:49 AM
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KE your cub.
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Oh man, thats' a shame, and whats worse is you found out the hard way that RC gear doesn't seem to last very long on control liners.

Another?
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Old Aug 04, 2015, 03:53 AM
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Most of the local flyers are now using these 4-40
http://hobby.dubro.com/resources/eca...ubro/00031.htm

very secure and long lasting clevis... so far so good >fingers crossed<
most of my models are flying with these installed

Az
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Old Aug 04, 2015, 11:15 PM
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I've used them myself, the good thing is the clevis is locked into place, and you can replace it when it wears.

I make a habit of checking mine every 50 flights.
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Old Aug 13, 2015, 05:25 PM
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When you say nitro fuel proof clear are you using 2k clear?

Cheers
Simon
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Old Aug 16, 2015, 12:35 AM
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The fuel proof clear over the top of the purple paint was

Top Flite TOPR7501 Crystal Clear
http://www.monokote.com/lustrekote/lustrekote.html

I bought the rattle spray can from Albury Hobby shop. It went over the base colour well and was fuel proof, though I was only using 5% nitro in the fuel.

Az
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Old Dec 06, 2015, 11:53 AM
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Wing ribs for Cobra.

Where did you get the plans for your Cobra? I found one on Outerzone, but the wing ribs do not seem right. I saw that a 3 inch bell crank was specified, but the one shown on the plan is bigger, and the cut outs for lead outs are not matching. It looks like I am going to have to modify the rib design, but being without CAD software at present, it looks like a pencil and paper job...
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Old Dec 07, 2015, 01:48 AM
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eBay plan

Hello Colinmeister,

I bought the plans from eBay,
http://www.ebay.com.au/usr/flyer21uk...p2047675.l2559
He sometimes has it available, not all the time though

I used a 3inch SIG bellcrank, which seemed to be the right size and fit within the wing okay. I added one extra rib bay on the inside wing

I also installed adjustable line guides and ended up with my lines probably 1/4inch behind the location on the plans!

It flew well, my first stunt trainer. I shall resurrect it one day

Az
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