On a whim I bought this engine here. I have been interested in these engines for some time but never found one for the right price. Well I found a well used one for a decent price.

This is the first time I have done a Box to the Bench run. I literally opened the shipping box, installed a propeller, and strapped it onto the test stand. I was told this engine had been run previously and I wanted to see how it ran before I did my normal inspection.

Well after getting it running my impressions are, eh. I am not really impressed with the engine at this point. I am trying really hard to find something positive to say about the engine. However, these are just my initial impressions based solely on what is shown in the video.

There are some things I do not like about the engine from this initial few minutes with it.

1. Side mounted glow plug.
2. Not a hand starter. (Now this could change when I get it properly tuned and setup)
3. The RPM range is really not that impressive. I recorded 9120 RPM during my test, but I did not realize that was pushing it according to the instructions.
4. Operating range of high speed needle valve very small. (Maybe this is due to the idle setting)
5. Length of the crankshaft. I had to use two prop washers from other engines just to get the supplied spinner nut to tighten down.

Instructions state the RPM range is 8600-9100 with a 12x6 propeller which is what I had on it.

I guess at this point I am unsure what the advantages of this design are. They say 'compact design'. But if it is gutless, who cares how compact it is. My Saito 50 and 56 will out turn this engine easily.

Well here is my video of the RVC 58CD Box to the Bench.

RCV 58CD box to bench (6 min 30 sec)

Man what a deal this was. Shooboy tipped many off to this sale Tower had. $71 for this airplane plus an $8.00 off shipping coupon. To my door at $71.98 or something.

This is a very high quality ARF. For the price it is comparable to the Value Hobby ones I've had. This is such a straight forward, easy assembly. There are no surprises thus far.

I am showing 3 of the 5 possible engines I will power this plane with. Since it has this nice strap-on type mount, engines swaps are a snap. Easy connector at servo to adjust for throttle lengths if necessary. I did not show my Tower Pro 46. or the Enya SS40BB.

This should be a great flying airplane. Time to start learning the pattern maneuvers again.

I just ran this engine after tearing it down completely, replacing the front and rear crankshaft bearings, and cleaning up all other parts. This engine is a keeper.

I also have several accompanying videos detailing the tear down, cleanup, and re-assembly.

OS FS-90 first run after rebuild (3 min 6 sec)

I started these on Friday and now have a total of 11 videos showing the steps of dis-assembling this engine and the beginning of the re-assembly process. The re-assembly will not be complete until next weekend as I am waiting for front and rear crankshaft bearings to arrive.

If you like what you see please comment and perhaps subscribe to my YouTube channel. Enjoy.
Playlist of all videos.
https://www.youtube.com/playlist?lis...aBL0ElDWgiCyAE

My Channel
https://www.youtube.com/user/dmrcflyr2

I couldn't resist and I purchased my 5th OS FS-90 from this group. Now I don't still have 5 of these engines, I have sold the first 4. This time I am going to keep this one. It is a used engine and in pretty decent shape. I ran a few tanks through it before I dis-assembled it. It ran well enough but since I am planning on keeping this long term I wanted to open it up and see the condition of the internals. I need to see if any bearings need to be replaced and things like that.

I decided to take videos along the way since I have not seen any FS-90 dis-assembly videos online. Here is part 1.

OS FS 90 Dis-assembly Part 1 (5 min 4 sec)

I had some more fun flying the Cloud Dancer today. This is such a sweet flying airplane with gentle flight characteristics. My 9 year old grandson Justus was at the controls of the camera. This young man has improved tremendously in his video skills. It isn't easy to follow an airplane in the air but he is doing great. We went to the field after the Home Depot Kids Workshop where Justus assembled and painted football toss game. Next month we make a fire truck.

Cloud Dancer 60 flights (3 min 41 sec)