Any one using JBA075A or dependable substitute?
09-24-2008 | 05:58 PM
#1
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Any one using JBA075A or dependable substitute?
I would like to power my US60 (under construction) with a 0.75 engine. I would like it to be a TH-0.75 but still out-of-stock. So, I have been searching for possible substitutions.
I see the OS-75AX as the last option due to its cost only. I know performance and reliability are there. Then, I have been looking at the JBA075A and supertigre, which is out of stock too.
So, Is there anyone using this engine or would like to provide a recommendation of a dependable substitution?
Thanks in advance,
Pedro
I see the OS-75AX as the last option due to its cost only. I know performance and reliability are there. Then, I have been looking at the JBA075A and supertigre, which is out of stock too.
So, Is there anyone using this engine or would like to provide a recommendation of a dependable substitution?
Thanks in advance,
Pedro
09-24-2008 | 06:53 PM
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From: Cincinnati,
OH
RE: Any one using JBA075A or dependable substitute?
This Magnum 91 is a very nice engine too! I believe it is identical to an ASP, but the Magnum seems to be more readily available in the US. I REALLY like mine!
http://www.hobbypeople.net/gallery/210806.asp
http://www.hobbypeople.net/gallery/210806.asp
09-24-2008 | 06:56 PM
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From: Cincinnati,
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RE: Any one using JBA075A or dependable substitute?
Oh yeah... The weight of a 91 is very little to no more than a 61, so a 91 will work very well on a 60 sized model. You just have to be a little careful you don't rip the wings off! 
09-25-2008 | 07:38 PM
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RE: Any one using JBA075A or dependable substitute?
As Turk says, the JBA .75 and .91 weigh the same. The .61, .75 & .91 are all built in the same case. The best one to buy is the largest, the JBA .91.
I have had an SK 90 and an Evo 100 on my US 60. The SK 90 requires a 15-6 prop so a longer gear or bigger wheels might be needed. I also have a couple of Tower .75s and they like a smaller prop. They really hum on an 11-8 or 12-6.
I would pick the JBA .91.
I have had an SK 90 and an Evo 100 on my US 60. The SK 90 requires a 15-6 prop so a longer gear or bigger wheels might be needed. I also have a couple of Tower .75s and they like a smaller prop. They really hum on an 11-8 or 12-6.
I would pick the JBA .91.
09-25-2008 | 10:58 PM
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From: Tokoroa, , NEW ZEALAND
RE: Any one using JBA075A or dependable substitute?
ORIGINAL: Ed_Moorman
I have had an SK 90 and an Evo 100 on my US 60. The SK 90 requires a 15-6 prop so a longer gear or bigger wheels might be needed.
I have had an SK 90 and an Evo 100 on my US 60. The SK 90 requires a 15-6 prop so a longer gear or bigger wheels might be needed.
For $65 or so it's hard to beat the SK for value.
09-26-2008 | 08:38 AM
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From: Cincinnati,
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RE: Any one using JBA075A or dependable substitute?
ORIGINAL: XJet
What's wrong with a 14x8 or a 13x10. I've used both and they work very nicely on the SK90.
For $65 or so it's hard to beat the SK for value.
ORIGINAL: Ed_Moorman
I have had an SK 90 and an Evo 100 on my US 60. The SK 90 requires a 15-6 prop so a longer gear or bigger wheels might be needed.
I have had an SK 90 and an Evo 100 on my US 60. The SK 90 requires a 15-6 prop so a longer gear or bigger wheels might be needed.
For $65 or so it's hard to beat the SK for value.
09-26-2008 | 11:54 AM
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RE: Any one using JBA075A or dependable substitute?
ORIGINAL: Ken6PPC
The best price I have found on a SK 90 is ~$100.
ORIGINAL: XJet
What's wrong with a 14x8 or a 13x10. I've used both and they work very nicely on the SK90.
For $65 or so it's hard to beat the SK for value.
ORIGINAL: Ed_Moorman
I have had an SK 90 and an Evo 100 on my US 60. The SK 90 requires a 15-6 prop so a longer gear or bigger wheels might be needed.
I have had an SK 90 and an Evo 100 on my US 60. The SK 90 requires a 15-6 prop so a longer gear or bigger wheels might be needed.
For $65 or so it's hard to beat the SK for value.
09-26-2008 | 06:04 PM
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From: Cincinnati,
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RE: Any one using JBA075A or dependable substitute?
That link is to a supplier in China. Not only will you have to pay for shipping from China, but you will have limited warranty support, at best. Buying one for $100 might be cheaper in the long run.
This is a quote from the article about the SK 90 on RC Reviews (I believe our very own XJet wrote this):
I used the shipping calculator on that web site, and shipping for one SK 90 from China will cost between $23 and $37, depending upon the carrier and timeframe. Shipping one from Kangke USA is a minimum of $6.50.
It doesn't appear that the SK 90 is quite the bargain that it seemed to be at first glance, but a purchaser in the US can have one delivered for a little over $100. That is still pretty cheap for a 90!
This is a quote from the article about the SK 90 on RC Reviews (I believe our very own XJet wrote this):
At this stage I have to issue a caveat in respect to my experiences with SK engines.
This particular example from the SK factory is indeed a great little engine but I had far less joy with an SK50 I purchased at the same time. This SK50 will be the subject of another review to be published shortly. However, it's fair to say that it is obvious that a factory which can produce engines at both ends of the quality spectrum has real issues with quality control.
I therefore issue my standard warning when it comes to the purchase of products that sport the "Made in China" label...
Don't be tempted to buy an SK engine from a dealer or distributor that doesn't perform pre-sales inspections and checks of the product. While you might save a few dollars buy purchasing directly from China, there's always the chance that you'll have wasted money rather than saved it. If your engine is a dud, the only option you have is to ship it back to China for a replacement which will almost certainly be uneconomical.
Do yourself a favor and buy from a local dealer with a good reputation for after-sales support. It'll likely be cheaper in the long run.
This particular example from the SK factory is indeed a great little engine but I had far less joy with an SK50 I purchased at the same time. This SK50 will be the subject of another review to be published shortly. However, it's fair to say that it is obvious that a factory which can produce engines at both ends of the quality spectrum has real issues with quality control.
I therefore issue my standard warning when it comes to the purchase of products that sport the "Made in China" label...
Don't be tempted to buy an SK engine from a dealer or distributor that doesn't perform pre-sales inspections and checks of the product. While you might save a few dollars buy purchasing directly from China, there's always the chance that you'll have wasted money rather than saved it. If your engine is a dud, the only option you have is to ship it back to China for a replacement which will almost certainly be uneconomical.
Do yourself a favor and buy from a local dealer with a good reputation for after-sales support. It'll likely be cheaper in the long run.
It doesn't appear that the SK 90 is quite the bargain that it seemed to be at first glance, but a purchaser in the US can have one delivered for a little over $100. That is still pretty cheap for a 90!
09-26-2008 | 09:48 PM
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From: Tokoroa, , NEW ZEALAND
RE: Any one using JBA075A or dependable substitute?
You're right I would advise anyone in the USA (where KangeUSA is the authorized distributor I believe) to buy locally and take advantage of the extra measure of quality control and support they've been proven to offer.
Those who live in countries where SK has no official support will just have to take their chances and import direct from China.
Those who live in countries where SK has no official support will just have to take their chances and import direct from China.
09-27-2008 | 01:17 PM
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From: Frederikshavn, DENMARK
RE: Any one using JBA075A or dependable substitute?
ORIGINAL: Ken6PPC
This Magnum 91 is a very nice engine too! I believe it is identical to an ASP, but the Magnum seems to be more readily available in the US. I REALLY like mine!
http://www.hobbypeople.net/gallery/210806.asp
This Magnum 91 is a very nice engine too! I believe it is identical to an ASP, but the Magnum seems to be more readily available in the US. I REALLY like mine!
http://www.hobbypeople.net/gallery/210806.asp
ORIGINAL: Flyboy Dave
....the ASP .91 two strokes are available....do a search.
Mucho power....little money.
FBD.
....the ASP .91 two strokes are available....do a search.
Mucho power....little money.
FBD.
09-27-2008 | 02:54 PM
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From: Tokoroa, , NEW ZEALAND
RE: Any one using JBA075A or dependable substitute?
The Magnum and ASP are the same engine but the SK90 is a completely different unit with markedly different characteristics.
09-27-2008 | 04:39 PM
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From: Frederikshavn, DENMARK
RE: Any one using JBA075A or dependable substitute?
Sorry. Yes, that's the SC that it similar to APS and Magnum... And DC as written here http://www.himodel.com/engines/A15A_...Airplanes.html
09-27-2008 | 06:53 PM
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From: Mount Royal,
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RE: Any one using JBA075A or dependable substitute?
I have a JBA 75 and all of the SK engine line. The JBA 75 and the SK 70 are identical except for engine porting (and the paint job). The JBA ports are higher, like a standard port engine, where the SK are lower, thereby lowering RPM but increasing torque.
