Fuji 099 SR

There are many versions of these engines, they look nice but the performance is not so great. A common factor is the low compression ratio, they are only meant to do around 10000-13000 rpm...

Surfer_kris wrote:There are many versions of these engines, they look nice but the performance is not so great. A common factor is the low compression ratio, they are only meant to do around 10000-13000 rpm...

The factory specs on the Fuji 099's (with Enya 09 for comparison) are as follows:

Engine	Bore x Stroke	Displ cc	Comp Ratio	CL oz	RC oz	CL hp	RC hp	CL rpm	RC rpm	CL prop	RC prop	FF prop
Fuji 099S-II	12.7x12.7	1.60	5.5:1	4.0	4.3	0.22	0.16	11000-14000	2500-12500	7x5	7x5	7x4
Enya 09-III	13.0x12.2	1.62	7.5:1	3.4	4.1	0.20	0.16	9000-16000	2500-13000	7~8x6~4	8x4~3	7~8x4~3
Fuji 099SR	13.6x12.36	1.79	7.7:1	4.1	4.6	0.28	0.22	15000-17000	2500-16000	8x5	8x5	8x4

Comparing it to my Enya 09-III TV, the Fuji 099S-II internals appear to be copied from Enya. Here is a photo of it along side the unrelated OS Max 10R/C:



The liner is a mirror image of the Enya. The Enya is a really nice engine, swinging a variety of props. I have found it does very well with a 7x6 wood prop, doesn't seem to like the plastics. I imagine the Fuji's lower compression means that it was intended to run on higher nitro fuel, like that for Cox .049's (25% nitro versus lower for the Enya). If one is not into pure power and coupled with the right airframe, the Fuji 099S-II seems to be a good sport engine. The 099SR is actually .11 in displacement. I am told that the 099SR is decent engine, very powerful.

Similar to the Enya, I imagine the power/torque curves peak out at a lower RPM. Peter Chinn's comments about the Enya 09-III TV is that there was no advantage to running props smaller than 7x4.

One thing I haven't tried is running the Fuji with a larger diameter prop. The lower compression reminds me of the Cox .049 Texaco. Break-in prop is listed as an 8x3. Unfortunately, the 8x3 is a hard to find prop. I haven't check to see if the Fuji will run with a 7x6 wood prop, producing more thrust than the 7x5.

As far as I can tell, most of which was gleaned from this

http://www.modelenginenews.org/ad/fuji_ch1.html

There were 18 versions of the Fuji 099 including the SR produced and developed over 25 years or so.

ian1954 wrote:As far as I can tell, most of which was gleaned from this http://www.modelenginenews.org/ad/fuji_ch1.html There were 18 versions of the Fuji 099 including the SR produced and developed over 25 years or so.

Yes, I remember reading from that website some time back when I was interested in knowing more about the Fuji .099's. Still wish I had my older twin port Fuji 099 on a 33" span Midwest profile P-63 King Cobra CL stunt job.

Prior to a year ago, I didn't know that my reasons for not being able to successfully run my ABC 099S-II was my use of plastic props. Those have too much inertia even for my Enya 09-III TV's. These engines run best on lower inertia wood props.

The advantage to ABC is being able to run with the modern fuels that have a slightly lower oil content. I have one 099 slated for a Hobby Lobby Miss Stik 55" (1,400mm) wingspan electric park flier. The other is slated for a House of Balsa 2x2 two meter glider. There, they should do a lot of good. With muffler the engine is a heavy bugger so it is best used in planes that have a short coupled nose moment, or follow modern 3D practice and mount servos in the tail to compensate.