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Author Topic: Brodack .40  (Read 2077 times)

Offline donchandler

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Brodack .40
« on: February 11, 2014, 05:45:19 PM »
i have  a Brodack .40 that I have never been real happy with. Rececntly I saw something that said not to worry, after a  gallon or so thru it it will be fine. I see others are doing just fine with theirs. Mine goes rich on outside manuvers. Same plane with an LA 40 does just fine-(same tank and fuel that is).

Is there a magic button with the Brodack?

Don
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Offline EddyR

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Re: Brodack .40
« Reply #1 on: February 11, 2014, 05:49:36 PM »
Tank is not at the correct height for this motor.
« Last Edit: February 12, 2014, 11:11:56 AM by EddyR »
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Offline Clint Ormosen

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Re: Brodack .40
« Reply #2 on: February 11, 2014, 07:48:53 PM »
Quote from: EddyR on February 11, 2014, 05:49:36 PM
Tank is not at the correct height for this motor.

Agreed. Just because its correct for the OS doesn't mean it correct for the Brodak. Move as needed.
If you have a low time engine, it does get better. Keep running it. What fuel blend are you using?
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Offline donchandler

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Re: Brodack .40
« Reply #3 on: February 11, 2014, 07:56:31 PM »
Sig Champion 10%
Hey Clint-Had the PM up today, flys great! This is the one the Brodack is on.
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Don Chandler

Offline Clint Ormosen

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Re: Brodack .40
« Reply #4 on: February 12, 2014, 03:13:41 AM »
Cool. I don't think that plane had more than 7 or 8 flights on it.

Wait a minuet. PM? Wouldn't it be a PF?
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Offline Brian Massey

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Re: Brodack .40
« Reply #5 on: February 12, 2014, 09:56:46 AM »
Quote from: Clint Ormosen on February 11, 2014, 07:48:53 PM
Agreed. Just because its correct for the OS doesn't mean it correct for the Brodak. Move as needed.
If you have a low time engine, it does get better. Keep running it. What fuel blend are you using?
I've had a Brodak 40 in both a scratch built Chipmunk (52oz) and now an arf Nobler (42oz) and it performs very very well. But it does seem more sensitive to tank alignment that some other motors. Get it setup where it's happy, and you will be very pleased with it's performance.  Wish I could say the same about the ARFs in general.

Brian
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Offline FLOYD CARTER

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Re: Brodack .40
« Reply #6 on: February 12, 2014, 12:55:38 PM »
I have 2 Brodak 40 engines.  Both required the exhaust exit hole from the stock muffler to be opened up before they would run right.  Do a search on Brodak muffler, and you will see this is the usual "fix".

Floyd
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Offline donchandler

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Re: Brodack .40
« Reply #7 on: February 13, 2014, 09:41:10 AM »
Ye-I mean PF.

Thanks for the tips Brian and  Floyd.
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Don Chandler

Offline Dick Pacini

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Re: Brodack .40
« Reply #8 on: February 13, 2014, 09:46:50 AM »
Quote from: FLOYD CARTER on February 12, 2014, 12:55:38 PM
I have 2 Brodak 40 engines.  Both required the exhaust exit hole from the stock muffler to be opened up before they would run right.  Do a search on Brodak muffler, and you will see this is the usual "fix".

Floyd

A search for Brodak muffler brings one to this thread.
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Offline Lyle Spiegel

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Re: Brodack .40
« Reply #9 on: February 13, 2014, 02:38:40 PM »
I used the Sig fuel in my B40 and was not getting same steady run as when I used Powermaster 10-22. I think SIG needed more oil so I added more castor to approximate the 22% in powermaster and got immeadaite improvement. I think SIG is 18% oil and B40 ran hotter. Added oil cured the problem
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Offline Dick Pacini

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Re: Brodack .40
« Reply #10 on: February 13, 2014, 03:34:53 PM »
Brodak says use 10% nitro, 11.5% synthetic, 11.5% castor oil.  A qt bottle is # BF 1218.
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Offline Garf

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Re: Brodack .40
« Reply #11 on: February 17, 2014, 06:03:19 PM »
Quote from: Lyle Spiegel on February 13, 2014, 02:38:40 PM
I used the Sig fuel in my B40 and was not getting same steady run as when I used Powermaster 10-22. I think SIG needed more oil so I added more castor to approximate the 22% in powermaster and got immeadaite improvement. I think SIG is 18% oil and B40 ran hotter. Added oil cured the problem
That says you are a long way from being broken in.
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Offline Balsa Butcher

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Re: Brodack .40
« Reply #12 on: February 18, 2014, 01:28:04 PM »
Quote from: Garf on February 17, 2014, 06:03:19 PM
That says you are a long way from being broken in.
No it doesn't. It says you are not using the recommended fuel. Even when broken in they run best on 10/22. If not completely broken in adding an extra 2.6 ounces of castor to the 10/22 blend will help stabilize the run. 8)
« Last Edit: February 18, 2014, 02:07:02 PM by Balsa Butcher »
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