Fox 07 R/C

No-that's the engine test-which I'm already familiar wirh...what I want is the actual operating instructions that would have come with the engine when purchased brand new.....normally a double sided pamphlet. Mecoa has most of them in archive form on their website-but they only go down to 09-as the rights to the 049 and 07 engines were sold off by Fox to Richard Rikel and his partner back in the early 90s...H&R Engines-the guys who reintroduced the Fox 049 FAI Special-long before Mecoa acquired the Fox line.... Of course the Fox 049/07 engine residue changed hands several times subsequently.

ChrisM
ffkiwi'

Hello ChrisM, I'm sorry I can't help, I'm just leaving my message to congratulate you on the acquisition, I didn't know about this engine and from the link Eric left, I see a beautiful R/C engine....congratulations and if you want it at some point, of gear to the engine, it will be a pleasure to see it working here. Thank you!

MauricioB wrote:Hello ChrisM, I'm sorry I can't help, I'm just leaving my message to congratulate you on the acquisition, I didn't know about this engine and from the link Eric left, I see a beautiful R/C engine....congratulations and if you want it at some point, of gear to the engine, it will be a pleasure to see it working here. Thank you!

Mauricio-they don't crop up that often-but they do appear on Ebay from time to time....as does the standard 07...also known as the 'Fox compact stunt motor'....the 07 R/C being 15 years ahead of its time-and 25 years ahead of its time in terms of a throttle for its size category-we had to wait till the MP Jet 061 appeared to get a throttle of similar refinement.....its a pity there was no really lightweight gear around at the time-other than cascaded escapement type single channel-that would have allowed it to really make its mark. As the engine test noted-other than capacity, there was very little parts commonality between the 07 and the 07 R/C other than the P/C set and glowhead.

I haven't run either of mine yet-but want to have at least some written backup in the event that the throttle settings have been fiddled with-and Fox throttles-at least of this era -were adjusted a bit differently to modern types and I have to find the correct settings. Powerwise-according to the tests both versions are up there with a Cox Medallion 049 or Black Widow-but capable of turning larger props-7x3 or 7x4-which is no bad thing-about 16% more swept area-which ought to suit some of the classic 1/2A designs from the 60s and 70s. In any case I'm by no means short of throttled 1/2A engines-so if these get used in anger it will be in something period appropriate.

ChrisM

Sorry Chris , I didn't read the whole article till now and see there is no reference to what a starting point would bee for the adjustments . Sounds like a interesting engine to run hope you can get it figured out .

getback wrote:Sorry Chris , I didn't read the whole article till now and see there is no reference to what a starting point would bee for the adjustments . Sounds like a interesting engine to run hope you can get it figured out .

no biggie-Eric and Roddie-the test itself I looked up as soon as i acquired the two examples. I'm just taking precautions in the event that the settings have been fiddled with. If they had, without knowing what the factory suggestions are, any adjustment by me could make things worse rather than better......mainly as regards idle mixture.....the setup as noted in the engine test article is a bit different to what is normal these days-with the low speed jet always in use and the high speed only functioning at full throttle...

As I noted-many years of collecting and using engines have borne out the truism that if something can be unnecessarily fiddled with.....it will be....and especially with diesels. i've lost count of the number of engines that have passed through my hands with the liner in backwards, or the piston 180 degrees out..!

ChrisM

Unfortunately I don't have any manual either...

You can get a rough check by blowing into the fuel line, a slight hiss usually works as a starting point. From what I remember the low end setting isn't very critical. Instead one would run the "low-end" well on the rich side, this gives a two-throttle setting, a rich low rpm setting a higher revving lean WOT. One should not expect a true proportional throttle like we have on more modern engines.

Here is a picture of one of my engines and the low-end setting: