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Author Topic: 1st generation Brodak .40  (Read 1797 times)

Offline DanielGelinas

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1st generation Brodak .40
« on: March 09, 2012, 11:53:34 AM »
Hi Guys,

I just purchased a pair of NIB 1st generation Brodak .40 engines.
I have searched the site along with the SSW site for more information on these engines.

I have found a lot of information on how good/bad the 1st generation of engines were.

I'm interested in hearing from people who have them running STOCK or near stock and have had good performance from them. Also like to here what their setup is.

Thanks!

-Dan H^^
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Offline Bill Little

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Re: 1st generation Brodak .40
« Reply #1 on: March 09, 2012, 12:09:20 PM »
Hi Dan,

I have one Brodak .40, AFAIK it is a first generation.  We run it with an APC 10 1/2 X 4 1/2.   It works fine in slight 4-2 run. 5% nitro Sig Champion 1/2 and 1/2.  Never tached it but it is in a "cackle" at launch. (on the 4-2 edge going back and forth)

Tom Hampshire might be the go to guy for these.  I believe he had a lot of input into the design.

Bill
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Offline Clint Ormosen

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Re: 1st generation Brodak .40
« Reply #2 on: March 09, 2012, 10:54:04 PM »
I also have a couple of 1st gen Brodak 40's. My setup is for them is similar to Bill's. Powermaster 10/22, Bolly Clubman 10.5x5 or APC 10.5x 4.5, stock venturi and NVA. Tach reads 10.4K-10.6K ground setting. In the air it's a fast 4 stroke breaking a bit in the manoeuvres. I don't use the stock muffler due to the weight, but the setup is the same. I like Scott Dinger tube mufflers for the Brodak. I think they make a steadier run and better power than any of the tongue mufflers I've tried.
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Offline DanielGelinas

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Re: 1st generation Brodak .40
« Reply #3 on: March 14, 2012, 11:58:51 AM »
Thanks Guys!
-d
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Offline Kim Mortimore

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Re: 1st generation Brodak .40
« Reply #4 on: March 15, 2012, 06:08:48 PM »

Hi Dan,

I flew a 1st gen Brodak 40 for a couple of years in a 38 oz. Old Time plane with very nice results.  It has less power than the newer versions, but for planes under about 42 oz. it's a good choice, in part because of the light weight of the engine.  The stock muffler is lighter than stock O.S. mufflers, but occasionally break in a crash.  The moral:  don't crash.  LL~ 

I tried a wide range of props and found that it liked most of them.  If you need to get the most power out of it, lower pitch (4") and a bit higher RPM should help, but only experimentation can tell you for sure.  Lots of guys recommend breaking them in exactly per the instructions.

What plane are you planning on putting one in?

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Kim Mortimore
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Offline Robin_Holden

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Re: 1st generation Brodak .40
« Reply #5 on: March 16, 2012, 01:14:04 AM »
Greetings guys from a sunny Charente.

I have an early B40 ..... Brilliant engine  !

I was out yesterday afternoon , with a Banshee.

Bolly 10.5x5.
21% total lube' [ 50/50 synthetic / castor ] , 5% nitro'.
Plastic Uniflow , No pressure.
Tongue muffler.

Couple of chokes , 2nd flick , launched at around 10,200 .....Bliss. End of plug for John's engine  !

Just a small point , I agree with some other contributers . Mine did need a careful and pretty long bench running in session.

Hope this helps ,

Robin.
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Offline phil c

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Re: 1st generation Brodak .40
« Reply #6 on: March 16, 2012, 08:42:31 PM »
I've got a couple of the first ones.  I find that it almost insists on running only in a strong 4 stroke.  I've got one in a light Smoothie and it runs well on either a 10/5 two blade, or a 10/5 3 blade Master Airscrew.  But it has to be set for a solid 4 stroke in level flight or it will lean out too much in maneuvers.

Check the head clearance.  One came through with about 0.80 in. head clearance and had a very weird run.  It would run a great 4 stroke in level flight, but break into a weak 2 stroke and slow down in maneuvers.  Decreasing the clearance between the head and piston to .015 fixed that completely.
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Offline patrick

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Re: 1st generation Brodak .40
« Reply #7 on: March 16, 2012, 08:50:28 PM »
I have 2 brodak 40 currently. how do u see if it is MK I or other MKs..... ??? H^^
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Offline L0U CRANE

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Re: 1st generation Brodak .40
« Reply #8 on: March 17, 2012, 12:46:57 AM »
Been running an early B40 on a 575 sq in profile at about 40 oz. On 11-4 or 11-5 APC and 10% nitro, 22% (50-50) oil in low 2-cycle there's plenty of consistent power. Haven't clocked RPM, just dialed it so that a barely audible 'strain' can be heard in overheads and clover...

Quite satisfactory...
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Offline Clint Ormosen

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Re: 1st generation Brodak .40
« Reply #9 on: March 17, 2012, 11:06:35 PM »
Quote from: patrick on March 16, 2012, 08:50:28 PM
I have 2 brodak 40 currently. how do u see if it is MK I or other MKs..... ??? H^^

Easiest way is to look at the exit hole in the muffler. 1st gen Brodaks have a really small hole. It's easier if you have a later one to compare with. When did you get the engines?
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Offline patrick

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Re: 1st generation Brodak .40
« Reply #10 on: March 18, 2012, 08:47:23 AM »
Quote from: Clint Ormosen on March 17, 2012, 11:06:35 PM
Easiest way is to look at the exit hole in the muffler. 1st gen Brodaks have a really small hole. It's easier if you have a later one to compare with. When did you get the engines?

well i got it a couple of years ago... i use my ruler to measure and it is 9.5mm or around 3/8''. so is that MK1? beside the outlet dia is there any other difference? 
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Offline Balsa Butcher

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Re: 1st generation Brodak .40
« Reply #11 on: March 18, 2012, 10:58:02 AM »
I just measured my thin wall muffler, 9.88mm outlet hole so you may have the first generation. Don't let this worry you. Either version gives strong repeatable stunt runs, quick starts and lotsa power. In the real world I have not been able to tell the difference between how the two versions perform. I run mine pretty much identical to what Clint and Bill Little recommend. 8)
« Last Edit: March 18, 2012, 12:58:13 PM by Pete Cunha »
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Offline Clint Ormosen

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Re: 1st generation Brodak .40
« Reply #12 on: March 18, 2012, 12:15:08 PM »
Quote from: patrick on March 18, 2012, 08:47:23 AM
well i got it a couple of years ago... i use my ruler to measure and it is 9.5mm or around 3/8''. so is that MK1? beside the outlet dia is there any other difference? 

No other external differences that I can find. Like Pete said, they all run pretty much the same. If your engines are brand new, follow the break-in instructions "to the letter".
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Offline Kim Mortimore

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Re: 1st generation Brodak .40
« Reply #13 on: March 18, 2012, 05:52:08 PM »

If you remove the backplate and look at the bottom of the piston skirt, early versions are perfectly circlular, while later versions have two large indentations cut into the bottom of the skirt, one on each side, as part of the power-increase program for the later engines.  You can't miss 'em.

Also, on all the B40s I have looked at, the crankcase on the early versions is a matte dark gray.  On the later versions it is a lighter, somewhat "glittery" gray, a bit like metallic gray paint on a car body.  I am told this results from sandblasting, but I'm not enough of a metallurgist to say fer shure.  Hope this helps.
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Offline DanielGelinas

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Re: 1st generation Brodak .40
« Reply #14 on: March 19, 2012, 03:18:19 PM »
I believe the prop screw is 1/8 inch longer on the newer versions.
Haven't decided between this engine or an older os 35s for an arf oriental.
-Dan
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Offline Balsa Butcher

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Re: 1st generation Brodak .40
« Reply #15 on: March 19, 2012, 05:14:06 PM »
The nice thing is they are unterchangeable...well, the B-40 is probably 1/16" longer than the 35S. Try them both, for the Oriental I predict you will like the Brodak better but both are good engines. 8) 
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Pete Cunha
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Offline patrick

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Re: 1st generation Brodak .40
« Reply #16 on: March 20, 2012, 07:39:41 AM »
Quote from: Pete Cunha on March 19, 2012, 05:14:06 PM
The nice thing is they are unterchangeable...well, the B-40 is probably 1/16" longer than the 35S. Try them both, for the Oriental I predict you will like the Brodak better but both are good engines. 8) 
Oh yes... i had the os 35s on the nobler and when i switch to brodak 40 mk I version that i have, there is no turning back....
 
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