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Post  fit90 Tue Dec 15, 2015 6:04 pm

I have a Cox Mantis radio control ARF that has been sitting around in the box for quite some time.  I started to take it apart to get it ready to fly.  I was wondering if anyone knows anything about this little bird.  It looks like it could be a nice enough little plane but I don't know how far I should strip it down just to make sure it is safe.  Any help would be greatly appreciated.

Thank you,

Bob


Last edited by fit90 on Sun Apr 03, 2016 12:01 pm; edited 1 time in total
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Post  fit90 Wed Dec 16, 2015 7:21 pm

Does anyone have any experience with a Cox Mantis? Mantis16
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Post  fit90 Wed Dec 16, 2015 7:21 pm

Does anyone have any experience with a Cox Mantis? Mantis10
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Post  fit90 Wed Dec 16, 2015 7:49 pm

Does anyone have any experience with a Cox Mantis? Mantis11
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Post  fit90 Wed Dec 16, 2015 7:50 pm

Does anyone have any experience with a Cox Mantis? Mantis12

the engine area had been factory fuel proofed and there was a deck behind the firewall.  The balloon tank sat on the deck.  I removed the deck to make room for a plastic tank.


Last edited by fit90 on Sun Dec 20, 2015 6:38 pm; edited 2 times in total
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Post  fit90 Wed Dec 16, 2015 7:50 pm

Does anyone have any experience with a Cox Mantis? Mantis13

The engine. It started as a tee dee .049. It got a non-spi sure start cylinder, a radial mount, an aluminum carb body, a carb, a starter spring, and a merlin style clamp on head with a hot insert


Last edited by fit90 on Wed Dec 16, 2015 7:56 pm; edited 1 time in total
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Post  fit90 Wed Dec 16, 2015 7:51 pm

Does anyone have any experience with a Cox Mantis? Mantis14

I re-glued all joints with CA


Last edited by fit90 on Wed Dec 16, 2015 7:59 pm; edited 1 time in total
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Post  fit90 Wed Dec 16, 2015 7:51 pm

Does anyone have any experience with a Cox Mantis? Mantis15

I roughed up the firewall and epoxied a 1/4" ply mount for the engine mounting and spacing since I am using a radial mount


Last edited by fit90 on Wed Dec 16, 2015 7:57 pm; edited 1 time in total
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Post  fit90 Wed Dec 16, 2015 7:52 pm

Does anyone have any experience with a Cox Mantis? Mantis16

I put a little extra support behind the fire wall


Last edited by fit90 on Wed Dec 16, 2015 7:58 pm; edited 1 time in total
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Post  fit90 Wed Dec 16, 2015 7:52 pm

Does anyone have any experience with a Cox Mantis? Mantis17

The fuel tank area and engine area have been fuel proofed with thinned epoxy
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Post  Oldenginerod Wed Dec 16, 2015 8:09 pm

Bob.
Doesn't look like you're getting much response from other members so I thought I'd keep you company. lol!
I know nothing about the mantis but it's a neat looking aircraft, not at all what I expected from the name. Good luck with it.
Can I just ask, why have you chosen to use a Sure Start cylinder on a Tee Dee. Do you plan to use a muffler?

Rod.
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Post  fit90 Wed Dec 16, 2015 8:40 pm

I chose the sure start cyliner to avoid SPI for all the normal reasons. I probably won't ever use a muffler but I have found that throttle response, especially transition to full throttle after a prolonged idle, is much better and more reliable without a muffler.

Thank you for the company, I was beginning to get lonely.
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Post  Cribbs74 Wed Dec 16, 2015 8:54 pm

Bob,

That is a neat little plane and had no idea such a thing existed. Lools like you are doing all the right stuff to build a good reliable model.

Good engine choice and I hope you have fun with it.

Ron
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Post  RknRusty Wed Dec 16, 2015 9:08 pm

Hi Bob,
I've never seen nor heard of a Cox Mantis. It sure is a different model from what the Cox name usually brings to mind. And a balloon tank, that's neat, but I guess it was dry rotted by now. It'll be interesting to see how it flies.
Rusty

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Post  roddie Wed Dec 16, 2015 9:49 pm

I was curious about this Cox model too.. and found these images. Did Graupner have a hand in the creation of this model by chance?

Does anyone have any experience with a Cox Mantis? Client10
Does anyone have any experience with a Cox Mantis? Us541710
Does anyone have any experience with a Cox Mantis? Zx721910
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Post  duke.johnson Wed Dec 16, 2015 9:52 pm

I haven't been able to visit the forum today. Cool plane. I'll keep my eye on this one, I'd buy and fly one for sure!
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Post  66 Malibu Thu Dec 17, 2015 12:13 am

Fit90...I have never owned a Cox Mantis but knew a guy who did. I believe you will be a might disappointed in using an .049 TD , since it came originally with a TD09RC from Cox. My friend said it flew fairly well with the TD09RC, but was heavier than he preferred.
I'm fairly sure that the kit may have been made by Hacker in Germany or Czech Republic ? They did the RTF's for Norvel back in their day also.
I hope to find a kit someday myself. I have a TD09RC ready for it if it comes without one......
Steve.....
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Post  getback Thu Dec 17, 2015 9:58 am

Looks like a nice little ARF , I had seen some of these on the bay but not thought to much about it , seems ARF are more about rebuilding the plane someone else started .... But it does appear that you know all the quirps and tricks to make it a good flyer , Thanks for sharing your build with us and would bee nice to see one in action . getback RC Plane
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Post  Mark Boesen Thu Dec 17, 2015 4:22 pm

i noticed the post when it first appeared, but didn't see any photos? Looks like a nice plane, but i also think it might be be a little doggie with a Tee Dee .049/.051. You might surf eBay for a O.S. .10 (or any .10 size R/C engine) that or go really light with components, small servos, battery pack, etc.. You also might look for a plastic clunk tank, as that metal wedge tank might cause fuel draw issues.
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Post  fit90 Thu Dec 17, 2015 8:45 pm

I will be using pretty light stuff. A small LiFe battery, a four channel Spektrum receiver, and three micro/sub-micro servos. I think it will do just fine on the tee dee .049. If not, then a Medallion .09 will be in order. I am also using a one and a half ounce plastic clunk tank. I think it is a Sullivan. I will post more pics this weekend.
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Post  ARUP Sat Dec 19, 2015 7:54 pm

I've never seen one of these but there is a lot I haven't seen... at least... that's what she said! Laughing
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Post  fit90 Sun Dec 20, 2015 6:15 pm

Does anyone have any experience with a Cox Mantis? Mantis17

Here is the inside of the fuel tank compartment.  I chose to vent the fuel tank from below the fuselage.  You can see where some fuel line is on the solid fuel tube that runs out the bottom of the fuse. This tubing will attach to the solid vent tube coming out of the fuel tank.


Last edited by fit90 on Sun Dec 20, 2015 6:21 pm; edited 2 times in total
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Post  fit90 Sun Dec 20, 2015 6:16 pm

Does anyone have any experience with a Cox Mantis? Mantis18

Here is a pic showing the throttle hook up


Last edited by fit90 on Sun Dec 20, 2015 6:22 pm; edited 1 time in total
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Post  fit90 Sun Dec 20, 2015 6:16 pm

Does anyone have any experience with a Cox Mantis? Mantis19

Here is the fuel tank with the vent line hooked up to the vent that goes out the bottom of the fuse.  This is a Sullivan 1.5 ounce rectangular plastic, clunk tank.


Last edited by fit90 on Sun Dec 20, 2015 6:33 pm; edited 2 times in total
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Post  fit90 Sun Dec 20, 2015 6:17 pm

Does anyone have any experience with a Cox Mantis? Mantis20

 Here is a pic of the fuel tank and throttle completely hooked up.


Last edited by fit90 on Sun Dec 20, 2015 6:25 pm; edited 2 times in total
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