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RE: New .90 gas engine (15cc) - 1/9/2011 3:21 PM   
a1pcfixer



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Status: offline 		Sheldon,

Your custom new muffler looks great!
One problem area though, get that fuel line re-routed AWAY from that hot muffler!!!!

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RE: New .90 gas engine (15cc) - 1/9/2011 6:24 PM   
airborne2.4


 

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Status: offline 		Thanks Jim, I thought about re-routing the fuel line..... I'll do it today while I'm at the field. Its 70 degrees here and currently the winds are N @ 8mph. A perfect day for flying

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RE: New .90 gas engine (15cc) - 1/9/2011 7:09 PM   
airborne2.4


 

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Status: offline 		Re-routing of the fuel line is done, I'll share some pictures tonight or tomorrow.

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RE: New .90 gas engine (15cc) - 1/9/2011 7:57 PM   
MrBill-TX


 

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From: Wichita Falls, TX, USA
Status: offline 		This horsepower rating thing keeps appearing. I do not have a dyno, nor a DLE 20. I can tell you my JBA is breaking in more each time I fly it and I am regretting putting it on a U can do 46. I really think it will pull the plane apart soon (running a 15x4 prop). Full throttle is never required. I may pick up a larger plane soon. Just to see how it does. May even stick it on a used funtana 100 I am looking at. just to see if it would fly it.

I have seen several motors with smaller displacement have more power. Size does matter on power, but it is not the only factor out there. The design of the motor (port timing, ignition timing, flow, etc...) will also make a difference. I bigger motor will have more torque usually, not always more total power. I am no expert but wish there was a good way to measure what a motor can do vs other motors and sizes.

Wonder if there is a good way to compare the two, power vs weight etc...


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RE: New .90 gas engine (15cc) - 1/9/2011 8:49 PM   
Pa-18cub150



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Status: offline 		Glad i'm not the only on this is confused by the hp ratings

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RE: New .90 gas engine (15cc) - 1/9/2011 10:58 PM   
Heli-NuBee


 

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Status: offline 		I do not have a DLE 20 but I do have a Zenoah G20 EI and I can tell you that the JBA 15G that I have is not nearly as powerful as the Zenoah G20. DLE has a good rep and I am sure that their 20 probably comes close to the power of the Zenoah G20. You are quite right that smaller engines can develop more horsepower than a slightly larger engine depending on design but I do not believe that is the case here. If there is someone out there that has both a JBA 15G and a DLE 20 would do a thrust test with both engines on the same platform, that would give a very good comparison. Thrust measured directly for these engines would clearly tell the story. Mfg. claims as to horsepower and not a very reliable means for comparison because they are often very inaccuracte.

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RE: New .90 gas engine (15cc) - 1/9/2011 11:25 PM   
airborne2.4


 

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Status: offline 		Re-routed fuel line.

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RE: New .90 gas engine (15cc) - 1/10/2011 4:37 AM   
MrBill-TX


 

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Status: offline 		I am in no way saying the 15 is weak, I am actually scared it is getting better still. I sure hope it is done breaking in. That or I will need a stronger plane.


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RE: New .90 gas engine (15cc) - 1/10/2011 2:31 PM   
Heli-NuBee


 

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Status: offline 		I am not saying that my JBA 15G is weak either. Nor am I saying anything negitive about this engine. I am simply saying that my Zenoah 20 is more powerful than my JBA 15G engine. I hope that this makes sense. Using a 90 engine in a 40 size airplane just could be overpowering a bit.

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RE: New .90 gas engine (15cc) - 1/10/2011 11:57 PM   
MrBill-TX


 

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Status: offline 		Ohh it is overpowered. Pretty fun but now that it is breaking in more and more it is a little hard to handle at times. I have been looking at planes designed for the DLE 20 and thinking of trying this on it..


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RE: New .90 gas engine (15cc) - 1/11/2011 1:16 AM   
airborne2.4


 

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Status: offline 		Here ya go
http://www.aero-works.net/store/detail.aspx?ID=406
http://www.aero-works.net/store/detail.aspx?ID=336

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RE: New .90 gas engine (15cc) - 1/11/2011 1:37 AM   
a1pcfixer



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ORIGINAL: airborne2.4

Here ya go
http://www.aero-works.net/store/detail.aspx?ID=406
http://www.aero-works.net/store/detail.aspx?ID=336


No, no, no.....THIS one;
http://aero-works.net/store/detail.aspx?ID=426

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RE: New .90 gas engine (15cc) - 1/11/2011 11:05 AM   
airborne2.4


 

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ORIGINAL: a1pcfixer


quote:

ORIGINAL: airborne2.4

Here ya go
http://www.aero-works.net/store/detail.aspx?ID=406
http://www.aero-works.net/store/detail.aspx?ID=336

No, no, no.....THIS one;
http://aero-works.net/store/detail.aspx?ID=426



Don't know how I forgot about that one



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RE: New .90 gas engine (15cc) - 1/11/2011 12:51 PM   
MrBill-TX


 

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Status: offline 		Yes, the proX260 is the one I have been thinking of. I have been told the 40-60 size would be a good fit, but I think it would be overpowered. I have been leaning towards the 60-90 size you listed.


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RE: New .90 gas engine (15cc) - 1/13/2011 12:49 AM   
Heli-NuBee


 

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Status: offline 		My Nitro Planes 60 size Mustang is coming along quite well now. Here are a few pictures of the JBA 15G engine installation.



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RE: New .90 gas engine (15cc) - 1/13/2011 12:51 AM   
Heli-NuBee


 

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Status: offline 		Here are a few pictures with the cowl rough fit.

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RE: New .90 gas engine (15cc) - 1/13/2011 1:26 AM   
airborne2.4


 

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Status: offline 		Looks good! After you run one gallon through that JBA 15, WATCH OUT

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RE: New .90 gas engine (15cc) - 1/13/2011 1:36 AM   
a1pcfixer



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Status: offline 		You should try doing something to insulate your spark plug wire from the heat off your exhaust pipes.
That plastic wrap may not last long so close to that heat.

Everything else looks great!!!!!

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RE: New .90 gas engine (15cc) - 1/13/2011 1:37 AM   
denney47


 

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ORIGINAL: Pa-18cub150

Glad i'm not the only on this is confused by the hp ratings

The HP rating on the 15G is wrong, I have asked the factory to give us a correct HP rating but not sure if and when we will get it.  We sell at least one of these engines per day but we do not advertise the HP rating.  If and when I get it I will post the correct HP rating here.
Tom
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RE: New .90 gas engine (15cc) - 1/13/2011 2:43 AM   
Heli-NuBee


 

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Status: offline 		Hey Denny,

Thanks for the update. I have been saying the same thing but in a less direct way. I do not believe that the 15G makes anywhere near 3.2 HP. I believe it will be much closer to the 1.6 HP developed by an OS 91 FS.

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RE: New .90 gas engine (15cc) - 1/13/2011 8:54 PM   
mpascual


 

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ORIGINAL: Heli-NuBee

Hey Denny,

Thanks for the update. I have been saying the same thing but in a less direct way. I do not believe that the 15G makes anywhere near 3.2 HP. I believe it will be much closer to the 1.6 HP developed by an OS 91 FS.



When i wrote the instruction manual of JBAJ15G for the factory, i sent this text :

Specifications:

Type 2 Cycle Air Cooled Gasoline Engine for airplane use only
Displacement (cc) 14.93cc ( .90 c.i.)
Bore x Stroke (mm): 27.8 x 24.6
Carburetor: Walbro WT series (Diaphragm & Butterfly Valve )
Maximum Output xxxHP @ NNNN RPM **** CORRECT THIS DATA or delete
RPM Range 1800-10.500 RPM CORRECT THIS DATA
Ignition: Auto advanced RCEXL DC-CDI (RoHS and CE Certified) with special spark plug cap.
Spark plug type: 1/4 * 32 Rcexl
Ignition Power DC 4.8 Volts (4 cell NiCad or NiMh battery)
Lubrication Oil: 2 cycle Engine Oil API TC / JASO FD or better specs. (Mobil +M2T)
Break-in fuel oil ratio: 25:1 (4%)
General use fuel: 33:1 ( 3%)
Recommended Propellers: 13*8-15*8 , (two blades)
Weight: 635 g (without ignition and muffler)
824 g complete (with ignition and muffler)

The factory put 3.2HP , not me .......

Regards

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RE: New .90 gas engine (15cc) - 1/13/2011 9:49 PM   
Craig 01


 

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Status: offline 		That would be inline with some other chinese manufacturers advertising not entirely correct figures for market share/increased sales.

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RE: New .90 gas engine (15cc) - 1/13/2011 11:25 PM   
aussiesteve



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ORIGINAL: Craig 01

That would be inline with some other chinese manufacturers advertising not entirely correct figures for market share/increased sales.


Why use the word "Some" ?

They actually may be posting the figures they believe - here is my reasoning on that.
In that Country, Many things are sold "By the Kg" - except the "KG" used is 500 grams - not the usual 1000 grams as used everywhere else in the world. Maybe their HP figures are similar - they are comparing to very small horses

I think all Non chinese enigne manufacturers should post thier HP figures with numbers that only include the number "4" - it is an unlucky number to the chinese and then the other manufacturers would finally have somehting they wouldn't copy



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RE: New .90 gas engine (15cc) - 1/13/2011 11:40 PM   
a1pcfixer



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ORIGINAL: aussiesteve

Maybe their HP figures are similar - they are comparing to very small horses



small horses....LOL!!!!

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RE: New .90 gas engine (15cc) - 1/13/2011 11:49 PM   
Craig 01


 

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Status: offline 		Maybe HP is for "Horse Pony",not very funny i know,oh well

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