Re: Cox Conquest .15

Kim Mon Apr 23, 2012 1:29 pm

Man....throw that thing in the saddlebag of that blue two-wheeler of yours and bring it down to the Skunk Works ! We'll run it, and video it! I got Thursday evening open !

WingingIt74 Mon Apr 23, 2012 1:33 pm

LOL you do, but I don't Smile

Surfer_kris Mon Apr 23, 2012 1:53 pm

You don't need any electric starters, the conquests are really user friendly engines, just prime until a little wet, set the throttle near idle and flip, should fire right up. Deburr the prop or use a glove.

If it doesn't start then something is wrong. Prime it a little wet and it will start if you have a good glowdriver. The handheld ones are not very good, the batteries have to be absolutely fully charged to be anywhere near the required voltage of 1.5V. The average battery voltage of 1.2V is not enough for a little wet engine...

WingingIt74 Mon Apr 23, 2012 1:56 pm

Surfer_kris wrote:the conquests are really user friendly engines

Easy for you to say Smile

Surfer_kris Mon Apr 23, 2012 1:57 pm

You'll also need full castor fuel, the synthetic stuff is no good on old-school engines...

WingingIt74 Mon Apr 23, 2012 2:04 pm

All I can tell you is my arm is sore,my finger hit the needle valve more then once and ripped my finger open.

Oh and fuel BURNS in a cut!!!! lol!

WingingIt74 Mon Apr 23, 2012 2:05 pm

I'll take a pic and you tell me what I am doing wrong.

Surfer_kris Mon Apr 23, 2012 2:18 pm

Yes, please do take a picture. How can you hit the needle valve...? Shocked

WingingIt74 Mon Apr 23, 2012 2:30 pm

Flipping it hard with my finger and giving it a little too much finger Wink

WingingIt74 Mon Apr 23, 2012 7:21 pm

Yes I see the air bubble, that's from sitting overnight.

I think I need a better glow plug clip, then the stock Cox clip.

ahrma_581 Mon Apr 23, 2012 7:50 pm

WingingIt74 wrote:I think I need a better glow plug clip, then the stock Cox clip.

When in doubt, alligator clips.

Any chance you wound up with a 2.0v glowplug? Used to make those, for wet cell batteries. Course that was back in the day, might be hard to find one nowadays, even if you were looking.

Surfer_kris Tue Apr 24, 2012 12:57 pm

The battery tray and clip from Bernie works well:

Cox Conquest .15 - Page 2 Cox%20starter%20battery%20box%20with%20clip%20049%20%20to%2015%20-%201

WingingIt74 Tue Apr 24, 2012 1:14 pm

Surfer_kris wrote:The battery tray and clip from Bernie works well:

I'll post a pic what I made. I can switch it from 1.5V to 3V. 2 D cells don't last really long when trying to get an engine to run though.

Surfer_kris Tue Apr 24, 2012 1:21 pm

2 D cells should last a few months, depending on how much you fly, you can also use rechargable batteries if you prefer. The trick is to not have the battery connected all time. Prime and turn the engine over until it feels right first, and only then do you connect the battery, it should fire right up or something is wrong.

WingingIt74 Tue Apr 24, 2012 1:26 pm

Ya you said that. BUT how do I know what "feels right"? I tried to get it to fire on prime only and no go, so I think my batteries were shot or my connection was bad.

nitroairplane Tue Apr 24, 2012 1:27 pm

WingingIt74 wrote:Ya you said that. BUT how do I know what "feels right"? I tried to get it to fire on prime only and no go, so I think my batteries were shot or my connection was bad.

It feels a bit wet but not sloppy and the compression feels a bit more because feel is tanking up space in the combustion chamber.

WingingIt74 Tue Apr 24, 2012 1:30 pm

It was just getting sloppy. Not sure what's up. Directions say 5 turns, but to me that seems to much, but I couldn't get it to run on 3.5 turns either.

Surfer_kris Tue Apr 24, 2012 1:45 pm

You'll need a good battery and connection to start an engine, sounds like a combination of too much fuel and not enough power to the glow plug.

fit90 Tue Apr 24, 2012 2:04 pm

Is your glow plug the correct length?

WingingIt74 Tue Apr 24, 2012 2:10 pm

as per MECOA, yes.

Surfer_kris Tue Apr 24, 2012 3:14 pm

Long reach is a good match to the thread length in the head, but it should run on any glow plug length anyway.

Jason_WI Wed Apr 25, 2012 10:57 pm

Hee is the new conquest I got off of RC groups a few weeks ago. Has the venturi, perry carb and tuned pipe. I need a pipe coupler and a needle valve for the venturi.

WingingIt74 Thu Apr 26, 2012 7:24 am

Jason_WI wrote:Hee is the new conquest I got off of RC groups a few weeks ago. Has the venturi, perry carb and tuned pipe. I need a pipe coupler and a needle valve for the venturi.

I think your exhaust manifold is upside down. Per the head and no spinner, it was a RC version converted. MECOA has most of those parts for this engine available I believe.

http://www.mecoa.com/rjl/c15/c15-parts.htm
https://shop.mecoa.com/shopdisplayproducts.asp?id=105

I wonder what the serial number means. Yours is 1002043 and mine is 2000203. Can there be that many out there?

WingingIt74 Thu Apr 26, 2012 7:41 am

per wikipedia:
Cox Conquest .15 (Cat# 2800 Manufactured 1976-1978)

I would guess yours is a 1976 and mine is a 1977.

WingingIt74 Fri Apr 27, 2012 7:08 am

I think the cylinder and piston are shot. It won't hold compression and it hisses past into the exhaust.

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