There is a new relabeled Area 51 out now but they are calling it a 55cc engine. It is a 44mm bore by 35mm stroke, That comes no where near 55cc

It is the same engine with just a few machining changes.

It was posted on the other site and the thread got deleted when the seller of the engine did not like the post made on it.

They advertise there and I guess the power of advertising money over powers the truth wins out. LOL

So much for a new exclusive dealer here in the US for JC engines, They also sell the smaller version of the JC line and have relabeled it also.

Well at least now people who have one of the Area 51 engines know where they can go also to get parts for them.

Milton

Too funny.... Not surprising though.

Perfect example of Karma. LOL
John

Found it, from GA I see.

No difference in the 28cc but the name

A lttle difference in the 50c plus

I am guessing that it is the REV 55 to which you refer. Sold by Precision Aerobatics.

Not only is it simply the Area 51 piston and cylinder, but the intellectual property on the crankcase used belongs to me. It is the old YD-A 56 unit. It is being used without my authority. These engines mysteriously appeared on the scene about a month after I sent my molds and machine codes to JC engines in Shanghai to manufacture items on behalf of an overseas distributor for my old brand name. I have the paperwork and proof that is needed to show this is 100% factual that the REV is the exact same crankcase that I own the rights to.

RC Aero Products is the only company that is authorised to use the designs I own. RC Aero products also has the full rights to use the YD-A brand name initials for the engines (I have the name registered in quite a few countries).

Precision Aerobatics have not once responded to any of my correspondence regarding this so I guess it is just fine for such companies to sell whatever they please and think they are above the law and ethics of the majority of their customer base.

So if it is the REV 55 that is referred to, Good luck any potential buyers. JC engines has a long history of manufacturing poor quality engines that do not last long (until forced to fix the problems - then they usually hide for a while). This is why even though they have released the new 60cc engine to some dealers, none actually have them for sale yet - they are being tested to find out what hidden traps there are in them (and experience shows that there is bound to be plenty). Being a Chinese manufacturer, there is only ever going to be an expectation that they will cheat, thieve and lie to make the next sale so they can pay for the next dinner for their family and friends and brag about what great businessmen they are. . Meanwhile, companies that should know better continue on even though they are informed of the issues and assist thiose business practices.

I know one brand of airframes I will never buy (who knows what the origin of those is) especially as they have refused to correspond on this issue of stolen designs.

There is also a 28cc engine in the range that is simply a relabelling of the JC28. I hope these ones don't have the tilt and die issues that many of the early Version 2 JC 28's I received had - I know what the problem was and it was associated with the factory using up any old parts they had laying around. I fixed them at my own expense with a simple modification (details of which were passed on to a couple of other JC Engines dealers). If you receive a REV 28, pick your plane up by the tail and see what the engine does - another brand got slammed over a similar issue - this one is no better. More than likely the stock they have received is simply the old product left in the factory.

Here is a typical example of how these companies work.

Last year, JC Engines obtained a DA 85 (he told me it was from his Dealer in Spain) then tried to copy it prior to returning it to the dealer that sent it to him. (it was going to be his JC85). I know about this because he made a huge mistake. He accidentally returned it to an ex dealer of his in Southern Africa (one of his many ex dealers around the world).

When the guy who supplied it to him got edgy about how long it had been away from him, Kevin Jiang at JC engines realised that he had made a mistake on where it had been sent to. Due to the actual recipients sense of humor, he let Kevin think it wasn't coming back to him. Kevin then asked me asked me if I could buy him a dA 85 and send it directly to the guy in Spain - I declined on moral grounds however I did contact the person who did in fact have the engine and asked him if he still had it - he sent me proof that he had in fact sent it on to Spain (we had quite a laugh about it all thinking of how much Kevin would have been sweating this). Eventually the Spanish guy did get his original engine back. I still have the e-mail chains regarding this and was just chuckling whilst reading them.


The copy of the 85 never made it to market because whilst it is simple to copy something, understanding the key elements of the design and getting them right are a whole different thing.

I really feel for the many other guys who have been duped by JC engines. I dumped them a while back, not because their final product is all that bad but the business ethics of the Owners are beyond anything reasonable.

Well I know what engine brand I'm not buying. Thanks Steve.

I could be wrong but if you take that engine case put a different cylinder and a 2mm longer stroke, you have Steve's original YDA 57.

Also when they changed the cylinder to a CM6 plug on the relabeled Area 51, They just drilled and taped it for 10mm plugs and did not machine it to work with a CM6 plug.

The threads are so deep the CM6 plug electrodes do not protrude into the firing chamber but are recessed up into the threads.

Milton

Interesting stance FG took in deleting an entire thread on the exact same subject. One would have thought that a reputable forum would see it in their readers' interest to be aware what is happening. I never saw any heated debates, personal slanging matches or anything such but only calm statements of facts like here.
Credit to RCU Moderators that they have left this thread alone.

It makes you think, given the rubbish that gets posted on "the other forum" where people go for one another tooth and nail and all of that is left to fester how quickly they responded to a big advertiser (Precision Aerobatics) to suppress the truth. I have myself been on the receiving end of slander on "the other forum" and my pleas to Moderators were not even responded to.

Interesting world we live in and I know very well which forum holds credibility in my eyes.

Again
Just shows the power of advertising dollars over the power of people posting the truth about a particular product. LOL

Milton

I've seen this on one of their earlier products. I still have a couple of heads where the plug boss is so deep it lowers the comression ratio about 15 points, causes severe plug fouling, and encourages "missing".

Steve knows of that which I speak.

You are absolutley correct

Unfortunately he also has the YD-A cylinder mold at his premises too so it probably won't be long before we see those under a different name as well. He has already shown a willingness to do it with the crankcase - why not the whole thing.

Then of course - if you was to get another 2mm or so on the cylinder diameter, and use another off the shelf piston and a DA85 lookalike cylinder - you have a - 60cc !!!

I wonder where those ideas came from.

I am sooooo glad to be out of that arena. The brands I enjoy now are the leaders, not the followers. (that is largely why they cost a little more I guess - nothing to copy so they need to spend time thinking up their own ideas and making them work)

[[/quote]

I've seen this on one of their earlier products. I still have a couple of heads where the plug boss is so deep it lowers the comression ratio about 15 points, causes severe plug fouling, and encourages ''missing''.

Steve knows of that which I speak.
[/quote]


Yep, I received this in my email quite a few months ago, from, guess who ! ha ha Sent all 4 of those engines back !!!!!!!!!!!!!!!!!!!! Pemanently !

"There are no issues with the plug seat - in fact the recess of the plug helps to obtain a clean burn and improve the environmental rating of the engines - this is a "precombution chamber" effect for the flame front propogation. There have been a couple of customers not this in their engines and they are not happy about it. We have decided that in order to obtain market acceptance, we will allow the electrode to protrude as is the "accepted practice" and we will ignore the environmental benefit of the original design."

DR

I was getting these cylinders for replacements when I was getting parts.

The first ones I took to a machine shop and had them milled for the cm6 plug to work, Sent Kevin (JC engine) a email about it but was told they were ok and to just use them.

Was costing me a good bit of change ($) to do that so I started changing the plug caps to a 5/8� hex cap and using a NGK CMR7A spark plug. This let the electrodes to protrude into the combustion chamber.

I don’t think nobody knows the he** I went through repairing JC engines.

Milton

I'll bite, bet it has 4 letters....

I figured out a couple weeks ago that I m a good engine designer also.

Took a Area 51 case and installed a some DLE clone crank, piston and cylinder to it, With a little modification it worked great.

Has to be one of the smoothest running engines I have ever seen but the squash is off about 1mm and the power is down about 8%

Need to mill off about 1mm from the cylinder or the case but not worth the cost.

Was just trying to figure out what to do with these cases I have no parts for

Milton

Made a nice looking engine

A Milton Special 55cc !

One thing for sure, If I need parts for it I know where to get them. LOL

Milton

I wonder if the Piston in any of these new JC engines is the same?

The REV, Area51 and the YDA all use the same two ring piston.

Milton

Milton,

I think Bob's post was a "play" on words.....................

The REV and Area 51 use the same cylinder.

Milton

LOL

Milton