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RE: JBA .56 - 1/30/2008 5:29:39 AM   
bigedmustafa



Posts: 2608
Joined: 6/19/2005
From: Omaha, NE, USA
Status: online
quote:

ORIGINAL: jjaypops

Hey Guys,
I ordered a .39 & .56 last monday from BJ's Model Engines ( they had the lowest prices I could find) three days later they were on my doorstep, I needed the .39 for a 40 size Piper Cub and did not have any time to properly break it in. So I just put it on the plane and ran it really rich for the first couple of flights. Let me tell you this engine "Rocks". I had a TT Pro on it before and the JBA blew its socks off. It had alot more power than the TT. I would definitely recommend JBA engines...


B.J.'s Model Engines sure sounds like a terrific place to shop, jjaypops!

BJ's Model Engines

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To a tree, balsa wood and MonoKote taste just like chicken!

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       Post #: 51

RE: JBA .56 - 2/1/2008 2:35:49 AM   
[AKA]StraferX



Posts: 92
Joined: 9/5/2007
From: Smyrna, DE, USA
Status: offline 		I purchased a JBA .56A and it arrived today. I hope to get er broke in this weekend. Probably will be on the bench testing since they are calling for monsoon rains, high winds and cold . May be thee flying gods will give us another break here to get some air time in.

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       Post #: 52

RE: JBA .56 - 2/2/2008 2:39:23 PM   
lowbatt


 

Posts: 7
Joined: 12/25/2007
From: Jakarta, INDONESIA
Status: offline 		my JBA New F series 46F and 56 F have came from factory. this sunday i will brake in and test it fly..

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       Post #: 53

RE: JBA .56 - 2/3/2008 8:41:09 PM   
mpascual


 

Posts: 71
Joined: 10/22/2003
From: Tres Cantos, SPAIN
Status: offline 		News: "the 4 stroke engine will be ready at March" (2008, of course).
JBA will deliver first batch in April/March




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       Post #: 54

RE: JBA .56 - 2/5/2008 2:38:29 AM   
bigedmustafa



Posts: 2608
Joined: 6/19/2005
From: Omaha, NE, USA
Status: online 		I received the following e-mail and pictures from Ed Moorman regarding my JBA .56. Ed is busy breaking in his JBA .56, and he has his Thunder Tiger F-75s to test as well:

-----
Ed,

Here are some more photos of your engine in the air. You can see it was a clear day and pretty dry for us down here. The engine choked down in outside squares, but I landed and opened the needle a little and it was OK. This is pretty common for us since we normally have a fairly high humidity. Not as high as up in Alabama, north of us. For some reason, near the coast it isn't as bad. Anyway, on a really dry day, everyone's engines run lean.

I'm going to test fly a new Ultra Stick 60/SK 90 tomorrow. Next week, I'll get around to removing your engine and sending it to you. Mine is on the test stand, but not run. I'll do it the same as I did yours and install it in the Wild Stik.

The photos are a little glary. Mark, who took the pictures with my camera must have bumped the control knob from the program setting to aperture priority so they came out with too much contrast.

Ed
-----

I'm looking forward to finally seeing my engine! It's nice to know that it will actually fly a plane. That Wild Stik is pretty cool looking with the negative angle of the wings. Apparently it removes the coupling effect when in knife edge flight.

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To a tree, balsa wood and MonoKote taste just like chicken!

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       Post #: 55

RE: JBA .56 - 2/9/2008 1:45:57 AM   
[AKA]StraferX



Posts: 92
Joined: 9/5/2007
From: Smyrna, DE, USA
Status: offline 		Finally got around to putting my JBA .56A on the test bench this evening. My new tach-0-meter descided today was a non working day so we went by ear. Gotta say I am please. The break-in went well and very excited about throttle responce. Quite snappy motor. Looking forward to seeing it in the air.

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       Post #: 56

RE: JBA .56 - 2/10/2008 12:55:42 AM   
[AKA]StraferX



Posts: 92
Joined: 9/5/2007
From: Smyrna, DE, USA
Status: offline 		Replaced the battery in the Hangar 9 micro tachometer so went back to the test bench. Here are my results.

Motor: JBA .56A
Fuel: Dynamite Blue Thunder Race formula 10%
Temp: 50* @ 13ft above sea LVL with 8 mph winds and 18% humidity
Tach: Hangar-9 Micro Tachometer
Plug: OS#8 -used
Prop: TopFlight 11 x 7 and TopFlight 12 x 6

Series Prop Max rpm Idle rpm

Tank 1: TF 11 x 7 @ 11,700 3600
Tank 2: TF 11 x 7 @ 11,739 3285
Tank 3: TF 11 x 7 @ 12,000 3100
Tank 4: TF 11 x 7 @ 12,120 2600

Tank 5: TF 12 x 6 @ 11,120 2500

I will perform another battery of bench runs tomorrow with a fresh glow plug and see how well it goes. So far I can see and hear the performance increasing as the test results show. Plenty of nice grey goo when running rich and good smoke. Throttle responce from 1/3 rd to full, 1/4 th to full, 1/2 to full and 1/8 th to full are very tight with no hesitation. I think it actually showed me some teeth when I tried to bogg it down but it wouldn't. Two bolts on the back right side of the head wanted to keep loosening a little bit so I tightend after every run. The only complaint I have would be that on the right side mounting tang were it meets the body, the paint is ever so slightly sparse. If thats the worst of my problems, I can handle that. I am very pleased with the performance so far and I anticipate that after a few more tanks of castor goodness she will be running in peak condition and tuned properly. Attached is a couple pictures on my crude test bench next to a garage I am building.



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       Post #: 57

RE: JBA .56 - 2/10/2008 1:27:25 AM   
rainedave



Posts: 5168
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: offline 		That engine looks a lot nicer in your photos than it does on the Kangke site. Thanks for the test data.

David

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       Post #: 58

RE: JBA .56 - 2/10/2008 8:56:00 PM   
[AKA]StraferX



Posts: 92
Joined: 9/5/2007
From: Smyrna, DE, USA
Status: offline 		Second set of bench test results are in and this motor is progressing nicely. Throttle response is still good and the castor blowing out the muffler is starting to get a little cleaner looking. I went with a fresh/hotter plug an OS A3. So here it is.

Motor: JBA .56A
Fuel: Dynamite Blue Thunder Race formula 10%
Temp: 40* @ 13ft above sea LVL with 27 mph winds with 42 mph gust and 36% humidity
Tach: Hangar-9 Micro Tachometer
Plug: OS A3 - fresh
Prop: TopFlight 11 x 7 and TopFlight 12 x 6


Series Prop Max rpm Idle rpm

Tank 6: TF 11 x 7 @ 12,200 2570
Tank 7: TF 11 x 7 @ 12,260 2550
Tank 8: TF 11 x 7 @ 12,300 2550
Tank 9: TF 11 x 7 @ 12,300 2550

Tank 10: TF 12 x 6 @ 11,300 2400


I am pleased with my results so far. This is the second engine that I have broken in and have learned a lot between the two. I would really like to try another tachometer and compare. What do you guys think of these results. Am I on par with what is to be expected. Is this good/bad?

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       Post #: 59

RE: JBA .56 - 2/11/2008 2:45:33 PM   
Fuelman


 

Posts: 1035
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline 		I have a JBA 56 and I was pleasantly surprised at how nice it ran. On initial inspection when I bought it, the inside of the engine had a lot of swarf and machining dust / debris in there that I flushed out. Pinch was nice and tight, which I thought was a good sign.
It started right up without problem and I ran a couple tanks through it like I normaly do without problem.
When I started fine tuning it, I did notice that the needle valve settings would sometimes have effect and other times little effect. I discovered the problem of it having horrible needle valve O-rings. I pulled them out and lubed them up nice with pure castor and all was fine for a dozen runs or so. I need to replace the O-rings for accurate tuning. It looks like they were too big for the application and were slightly cut upon installation. Other than that, I thought it ran fine and have flown it numerous times on my dad's Sportster Bipe. It ran a lot stronger than the 46FX that was on it (it had to be removed due to its liner peeling for the second time).


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Fuelman
Cooper Fuels LLC

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       Post #: 60

RE: JBA .56 - 2/15/2008 6:53:38 PM   
bigedmustafa



Posts: 2608
Joined: 6/19/2005
From: Omaha, NE, USA
Status: online 		Well, it looks like Ed Moorman is finished with my JBA .56 and is preparing to start flying his own. I received a nice e-mail from Ed today that sums up his experiences with the engine so far:


"I am leaving the needles right where I had them. The high speed might be a little rich for you. I always fly with a nice smoke trail so I don’t get too lean in maneuvers or at the end of a flight.

Your engine has 5 break-in runs, plus 2 or 3 tanks for the rpm testing and 4 or 5 flights, I forget. It 1-flip started and never missed a beat in the air. I flew it with an APC 12.25-3.75 3D prop, Omega 10% castor blend fuel. I would say an 11-7 or 12-6 would be good props, too. The glow plug is a K&B that I had and nothing special. It didn’t come with one and this one lasted the whole time. I wouldn’t change any of the settings for the first flight. Oh, yes, I had a kill button set up on my JR 9303 and the engine shuts down after maybe a 1-3 second delay.

They both started by hand in usually 1 flip. The only time I used a starter was when I was doing the rpm runs and ran short runs to tune for max rpm, then shot down and changed props. The engine never got a chance to really cool down. I bumped it with a starter and it went right off.

To tell you the truth, I have looked for a down side and haven't found one. It just starts up, runs good and keeps on running. And it will definitely out turn any .46 out there. Maybe not a Jett on a small 10-6 prop, but probably would on a big one."

Ed (Moorman)

I have a Phoenix Models SeaBee ARF that is likely going to be the new home for this engine once Ed ships it back to me from Florida. It's 10 degrees Fahrenheit today with 30 mph north winds here in Omaha, NE, so having Ed test out this engine for me is about as close to glow flying as I'm likely to get for a while!

It looks like the $79.99 I spent on this JBA .56 has turned out to be money well spent.

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To a tree, balsa wood and MonoKote taste just like chicken!

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       Post #: 61

RE: JBA .56 - 2/15/2008 10:41:43 PM   
Ed_Moorman



Posts: 3683
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline 		And I got to try if first, check the rpm on my test stand and then fly it. I liked it so I bought one of my own. I'll be flying it in a couple of weeks. This weekend, my buddy Flaps Laffert has me testing a refurbished Northrop A-17, 1930's dive bomber and predecessor to the Douglas SBD Dauntless, which he flew in WW II. It's been cleaned up after hanging a couple of years and a new set of Robart retracts have been installed. It has perforated flaps.

The photo is Flaps and the original A-17. Magnum 1.08 power.

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< Message edited by Ed_Moorman -- 2/15/2008 10:42:13 PM >

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Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

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       Post #: 62

RE: JBA .56 - 2/16/2008 12:10:07 PM   
Turk1



Posts: 644
Joined: 10/8/2004
From: Istanbul, TURKEY
Status: offline 		Kangke replied no JBA 56 available now until may.I wonder anybody can buy a JBA 56 from Kangke these days?(Special treatment for me??)

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       Post #: 63