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Dec 22, 2012, 01:27 PM
Registered User
Scaledown, sorry to hear that the FOK is not co-operating. No popping, no suction. For fuel suction try: thumb over the venture, get an air bubble in the fuel line, flip the prop. Does the air bubble move? If not, then possibly an air leak at the seal on the rear cover (which was ok before you removed it?), or the piston/cylinder taper is too loose at the bottom as you have suggested.
To get a “pop”, prime the engine with fuel, then add a drop of 30W oil into the exhaust area. The oil will help with the seal for one or two pops before it is burnt out.
Page 237 post #3701 has a review for the FOK25.

The Taifun Hurrikan is a very nice diesel. I’ve always liked them since I first saw one in my LHS (early 1960s). Post #3730 shows what appears to be a home made twin.

An R/C carb for the 1.5, the Parra Wasp uses an Enya carb, post # 3836.

Shown also in post #3836 is the Cox .09 for comparison. There was also an RC version that used an air bleed carb.
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Dec 26, 2012, 06:44 PM
Bill Mohrbacher, MECA Fox Guy
G WILLIE's Avatar

WOHM Diesel


Reggie, Did you ever take your WOHM apart? My wife got me one for Christmas. I'm curious to see inside.
Dec 28, 2012, 05:47 AM
Registered User
Reginald's Avatar
Quote:
Originally Posted by G WILLIE
Reggie, Did you ever take your WOHM apart? My wife got me one for Christmas. I'm curious to see inside.
No way. That engine was run-in by the maker and with diesels it is better not to unscrew things when the engine is set up properly. The only thing I did replace are the lockable set screws that you can obtain from that same maker, forgot his name right now......
Dec 28, 2012, 08:48 PM
Registered User
earlwb's Avatar
I haven't looked inside of my WOHM engine either. I would only do it if I had to because of a problem of some sort.
Dec 28, 2012, 09:11 PM
Registered User
A side comment, the TD 09 is a 50 year old design, and still a standard for comparison for high power 1.5cc engines. I wonder, 50 years from now, what engine new today will be the standard for comparison? Maybe we will still use the TD 09.
Dec 30, 2012, 04:01 PM
pch
pch
Registered User

Fok 15


Scaledown, I have samples of the FOK 10, FOK 15 & FOK 25. They came to me as a box of spares & faulty returns from when Ripmax, the UK importers, stopped supporting them.

I only managed to get one FOK 10 complete & running, but this is a delightful sport engine easy to start and runs very reliably. It was regularly used in a reduced size F/F Rambler, trimmed properly for a near vertical climb then that slow circling glide.

I made up a couple of FOK 15s, these are lightly made engines that like to rev, probably not much down on power to my PAW 1.49s and usually power my C/L Jasco Tracer, but they are a little fragile.

There were lots of FOK 25 bits in the box, so I assume they had more returns of this size. I spent quite a lot of time selecting the cleanest ones and then lapping the piston/liner till I could get them running. IIRC much of the lapping was done with toothpaste. The 25 was not my favourite engine, a bit of a slogger, so most were sold on.

..................Paul Harrison
Dec 30, 2012, 04:50 PM
Registered User
Gluehand's Avatar
This FOK 15 (1.5 cc) was manufactured for Engel Modellbau in Germany, who sold it as "Engel Rebell", designation cast into the crankcase.
My example is pretty much used, but still in good condition, with a nice "bouncy" feel when flipping the prop.
This is a late version with a single R/H exhaust port (in order to simplify manufacure of an exhaust collector/silencer).

I have yet to find some use for it though...I've been thinking of putting it in a power pod for a glider eventually...it's too good to sit in a drawer....

Dec 30, 2012, 11:30 PM
Registered User
earlwb's Avatar
Quote:
Originally Posted by Jim Thomerson
A side comment, the TD 09 is a 50 year old design, and still a standard for comparison for high power 1.5cc engines. I wonder, 50 years from now, what engine new today will be the standard for comparison? Maybe we will still use the TD 09.
I could see that standard moving to some other 1.5cc engine. But it is hard to choose something else. Cox simply made so many of the things. Cox very likely made more .09 engines than all the other engine companies did combined. So it is hard to beat those production numbers. it just makes that engine one of the most common ones to see and use.

I would probably choose the Parra 1.5cc engine as a new bench standard to compare to. But some other ones would be good candidates too.
Dec 31, 2012, 02:55 AM
Greggles47
greggles47's Avatar
You Americans will continue to love the TD's but in terms of sheer performance the Oliver Cub would be a far better motor. But again it's not comparing like with like. The Cub was a TBR diesel and could swing a very wide range of props. In 1/2A Team Racing it was unbeatable for many years.

Regards

Greg
Dec 31, 2012, 03:59 AM
Registered User
Reginald's Avatar
Quote:
Originally Posted by earlwb
I could see that standard moving to some other 1.5cc engine. But it is hard to choose something else. Cox simply made so many of the things. Cox very likely made more .09 engines than all the other engine companies did combined. So it is hard to beat those production numbers. it just makes that engine one of the most common ones to see and use.

I would probably choose the Parra 1.5cc engine as a new bench standard to compare to. But some other ones would be good candidates too.
Exact production numbers were published in MAN or Flying Magazine years ago, I seem to remember a total production of over 32 million engines ! Imagine shoveling that amount into your basement.
Dec 31, 2012, 05:59 AM
It must have a machinegun
Scaledown's Avatar
I've got an Engel Rebell 1cc which starts well and produces plenty of power. I had expected my 1.5 to be good also.

Did FOK produce Engel or did Engel produce FOK?
Dec 31, 2012, 06:49 AM
F1B is ok.
Alexander Engel was/is only a dealer. (Brochure of 1958.)

Heinz
Dec 31, 2012, 08:56 AM
Registered User
Gluehand's Avatar
Aah...the tiny 0.25 cc VT-11 is a real beauty....and very rare....

The Hungarian ALAG, VT, FOK etc, belong to a huge engine family, connected to the AKKÜ Company, the Vella Brothers a.s.o...
An interesting history lesson by Adrian Duncan is to be found HERE

Also, HERE is a site, showing several members of the actual family tree, mixed with other fascinating, rarely seen engines.....

Dec 31, 2012, 09:01 AM
Registered User
Hastf1b, what is/was a DM in exchange for $ 1 US?

About 1959 a Cox Olympic .15 was $12.95

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Dec 31, 2012, 09:03 AM
Registered User
Gluehand, nice collection.
The "Red Head" glow in the back almost looks like the McCoy RV racing engines.
John


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