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Discussion Starter · #1 ·
After flying with Dave McDonald and seeing his MCP, I had to have one, so I ordered a MACs header, wasted a can of mousse and built the thing. I tached my 46FX with the Tower muffler and with the MCP and here is what I got:

Prop: APC 11.5x4
Cool Power 15%

Tower muffler: 12,900
MCP: 12,900

Normally I don't pay any attention to tach readings. If it sounds good and is running strong, I fly it. This is only the 3rd time I've used the tach since I've had it (over a year).

This is not what I expected. The throttle response seemed the same with the two "pipes" also. I generally get good spoolup, with a slight lag with this prop on both. It's my normal flying prop on all my 46's.

I'll get measurements and pics of it later, after I get the kids to bed.
 

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Quicker said:
exactly

Maybe my tach is busted.
or you left it in memory LOL :p
 

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For a mousse can to work correctly, it has to be properly constructed and tuned.

The header pipe has to go into the mousse can quite a ways, almost to the rear of the can, for tuning to take place. Just mounting a mousse can on a header gives you a light, ugly muffler.

Do a search on RCU in the Fun Fly planes for "mousse can", and I think it was Ed Moorman who showed pics of a disected UltraThrust muffler. This is what a proper mousse can muffler should look like inside.
 

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Discussion Starter · #9 ·
Dave McD came back with what seems to be my problem. I used too big of a can.

The style of pipe he is building is not like the traditional MCP in the links Chuck provided. He told me he has built those, and while they gave great boost, the throttle response was not linear, thus poor for 3D. His pipes use a small mousse can (1.75 inch diam) and only have the header go far enough into the can to get a good JB weld joint.

It's too windy here to fly during lunch, so I'll be off to Walmart over lunch to get a new can.

Here is my original header and can. I'll post results hopefully tomorrow.

 

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Discussion Starter · #10 ·
Well, I just got back from a nice lunch hour of flying the Burrito, on my rebuilt MCP.

HOLY CRAP!!!!!

Dave McDDD is a friggin genious :lol: I tached it at a solid 14,000. I got 14,400 at times. I think with a little more needle work I will get it at 14,400 solid. The throttle response was linear and PERFECT, with instant spoolup. The Burrito felt like a totally different airplane.

The change was going to the smaller can that is 1 3/4 inch in diameter. The header only goes into the can about 1/8 inch. Just enough to get a good JB Weld joint.

I'll get pics and measurements tonight.
 

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Quicker, glad to hear your MCP is working great now!

Paul, if you ever get around to putting a MCP on a Webra 50, I'd sure like to hear about your results.
 

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I wanna do that to my Webra's.....
Just don't try to sell em so you don't get in trouble!

If you make one and it works, can I buy one fromy you? :lol:
 

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rik756 said:
I wanna do that to my Webra's.....
Just don't try to sell em so you don't get in trouble!

If you make one and it works, can I buy one fromy you? :lol:
It would be best if you give me one and I will do a review for no charge. :lol:
 

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Discussion Starter · #17 ·
I wanted to make sure y'all noticed on my MCP I was NOT using a stinger. I used a phillips screwdriver to pop the plastic nipple into the can and used the stock hole as the exhaust outlet. The plastic nipple came out the 3/4 inch hole I made in the bottom of the can for the header.

This was on a 46FX. I'm going to be putting this pipe on my MECOA 46 this week to see what it does. I need some more power on my Katana.

A good friend of mine is a decent welder, so we are starting to play around with making our own headers. I have a hard time paying $25 for a MACS header just to stick it on a $1.25 mousse can.
 

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Quicker said:
A good friend of mine is a decent welder, so we are starting to play around with making our own headers. I have a hard time paying $25 for a MACS header just to stick it on a $1.25 mousse can.
Thats the same problem Ive been having, especially on a cheap 25 buck bushing engine to go buy a header that ends up costing more then the engine did. Im sure Id buy a couple headers if you are going to sell some.
 

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Discussion Starter · #19 ·
We'll see. I'm curious as to how the weld will hold up. Last thing I need is a bunch of Bros pissed off at me because of mousse canns falling from the sky.
 
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