They might be saying the size of a 90 but they are the size of the 61 by evolutiion with allmost the same fin design and weight minus the carb and electrionic ignition, of course.

They're NOT just saying, it's true!

This JBA-15G has the same mounting dim's as a Saito 100! Far cry from an Evolution .61
PLUS, this weighs almost 6 ounces more than an Evolution .61

I believe Mike is more interested in a suitable fit, than something that'll rip his wings off,
mess up his CG, and be a bear to handle.

Sometimes, being advised what's NOT a good match, is just as important as what IS a good match.

I agree that gas engines generally produce less power than nitro engines. Judging from the prop that the JBA 15G pulls (14x7), this is the equivilant to what my OS 91 FS pulls which is the rough equivilent to a 60 size two-stroke nitro engine in power. I also believe that this engine is a bit heavier than a 60 size nitro engine but will be able to use a smaller fuel tank to help off-set the weight increase. IMHO the JBA 15G engine was developed for 60 size aircraft and therefore should be acceptable for use in any aircraft designed for 60 size engines. Maybe the mfg can offer his opinion on this subject. He has made some contributions earlier in this thread.

Heli-NuBee (Roger Anderson)

Ok, this is what I was thinking....

I originally thought the 15G might be a little too much but then i started reading this thread from the beginning and see that a lot of people were putting them in .46 sized airframes. Actually a few pages back a host of people were saying that this motor would be a perfect match in the Aeroworks .46 - .61 Edge 540T ARF. If you compare the specs of the AW to that of the Staudacher they are almost the same except for the weight of the airframe.

540t vs. Staudacher
Wingspan 60" vs 60"
Wing Area 693 vs 690
Length 55" vs 48.5"
Weight 5.5 to 6.0 lbs vs. 7.5 lbs

The Staudacher is an older design and built like a brick which explains the heavier weight but it is also not meant to be a 3D performer like the Edge. It's realm is sport flying and an old fashioned IMAC routine which is the type of performance i desire.
After my original post I've talked to a couple modelers who've built and flown the staudacher and they both had .61 two-strokes in the nose. They didn't think the extra weight would be a problem because they both had to add quite a bit of lead in the nose to make her balance.
I'm going to mull it over a little more and see if any more opinions pop up but I think I may give it a shot. Besides, I'm in no hurry because it'll be a little while before its flying season again up here in Vermont[&o]
Thanks
Mike

I had a Staudacher at one time. We used three different engines in that airplane during its life. We used a YS 120, an OS 91 and a 26cc RCGF gas engine in that airplane. I believe the wing span was slightly larger than the one you have some where between 64" and 67" but the plane was never over powered. All 0f the engines required additional weight in the nose of the airplane to balance. Mine had a nasty habit of wanting to tip stall if one slowed down too much on landing but it flew quite well. It met its end when the engine faltered in a forced landing go around causing a tip stall with resultant crash. It sounds as though you would be OK in using the JBA 15 in your airframe. You are correct about some of the folks using this engine in 40 size aircraft. I think that one has to look at each aircraft individually to determine if an engine will work in that airplane. For instance, I have an older Funtana 90 airplane that is powered by a Brillelli Toro 25 gas conversion engine and it is not over powered. I also have a Phoenix Sukoi 31 (a 46 size airplane) powered by a Tower Hobbies 75 that is close to over powered. I hope that this helps.

Heli-NuBee (Roger Anderson)

Here are a few pictures of my old Staudacher.

My Aeroworks 540 T weighs 7lbs 1oz dry with an old Veco .61. The Veco with muffler is about 17&1/2 oz. Im thinking of this engine & would like to hear how it does on this plane.

http://www.rcuniverse.com/forum/m_35..._1/key_/tm.htm

I love my AW 46-61 Edge 540T/JBA 15cc combo.
Thanks Jim and Jody for your advice
http://www.rcuniverse.com/forum/m_96...13/key_/tm.htm

<font size="2">Merry Christmas!

You will find the 15cc upgrading size 17cc, and my new 25cc/35cc-with side-exhaust/35cc-with rear-exhaust/ 70cctwin one by one.

please pay attentions after your vacation.


best wishes for you all!

michaelchow</font>

Will it be cost effective to turn the 15 into a 17cc?A simple liner and piston change maybe,Thanks

Mr. Michael Chow

Thank you for your efforts. We look forward to all your new products.

Happy Holidays!

Heli-NuBee (Roger Anderson)

Here here is a second try at uploading a few pictures of my old Staudacher



Read more: http://www.rcuniverse.com/forum/m_96...#ixzz18cDhMEkC

Help: I have tried tuning the high speed needle WOT and everytime I get my fingers close to the needle the engine changes RPM. I have set the needles and so for the engine is still not reliable. Also I have noticed that when it dies sometimes the prop is winmilling as if it has no compression but as soon as I check it on the ground the compression seens to be just fine. I have set the needles everyway to get the best idle and transion to high and as of now the carb changes every flight. Any thoughts and help would be greatly appreciated. The winmilling has only happened three times and at first I thought I was loosing my mind.

Do you have a pic of what the wrap round Pitts muffler looks like or a product number ?

I'd give Jody or Tom a call and see what they have to say or offer.

A 17cc would work on a .60-.90 size model? What would you mount a 25cc on?

A 35cc WITH A REAR EXHAUST

yes the 17cc fit the .90 model, and 25cc is same size as OS120.

35cc is with two style, side-exhaust and rear -exhaust.

in 2011,  I will promote the 9cc gas engine fit the size less than 1.5m model, with more smaller and lighter Carb and CDI.  this is important!

I will show the whole manufuture and process, this is my dream to share the process of manufacture with your all advice and enjoy the sucess with you all.

because you are all expert and I trust you and happy to do this work with you.

I just want to change something of the current products and service to fit your requires.

and I will show my new company and new engines fly in the blue sky with more videos. should be after the colder winter. so from now you all can enjoy your vacation and happy time, but  I can't and I must work hard to complete, this is my happy time. haha !

ok,  it is all!

Happy New Year!

see you all in 2011.

 best wishes from your worker and <font color="#0066cc">employee</font>   Michaelchow    haha!

A 9CC? Awesome!!!
Even more glow engines can be replaced with gas!

Sure will look forward to the specifications and photo's of your 9CC gas engine!
Happy New Year indeed!

Hey Noflaps, go to J-Tech's web site for info on the pitts muffler. They make several different configurations to suit your needs. Here is their link http://www.jtecrc.com/index.htm

Heli-NuBee (Roger Anderson)

You know, this thread really sucks. The majority of the posts have nothing to do with this specific engine.

Anyway, This engine will work perfectly in replacing a .60 sized engine. I have one in my Pica FW190 and it is perfect really. Again, I am having the same reliability issues. I have only had one flight that did not deadstick. I think it might be my small tank. The internal hardware just needs more room to move around.

Please try to keep this thread on topic.

I'll have to think of a way to display my glow engines LOL. Goodbye glow fuel

You could weld all your glow engines together, and make a BIG yard ornament!

Between this new 9cc, JBA-15cc, the new 17cc, and the DLE20cc, a whole slew of
expensive (fuel) slimy glows are going to get sold &/or retired!

Sure hope that 9cc is light and a good price.

Hey Vertical Grimmace,

How many flights do you have on your engine and what size is your tank? Also, what type of fuel line is on the clunk and is it quite flexible? I have not flown mine yet but there seems to be several of you folks with reliability issues out there. I found that my engine on the test stand was quite sensitive to being lean on the high end and would quit suddenly if it went in the least bit lean. You could well be correct about your tank.

Heli-NuBee (Roger Anderson)

A yard ornament sounds like a good idea LOL

DLE started the revolution with the introduction of the new 20cc!! JBA is also riding the wave with their 15cc and we'll soon have a 9cc and a 17cc!!!!! The glow engine manufactures won't be happy about this.
The 35cc with a rear exhaust should be interesting, can't wait to see the specs.

That Staudacher looks familiar to me