Hi there. So I had finally picked up a gallon of Sig Champion 5%, All Castor Oil for my Fox engine (thank you Dennis for picking this up for me). I am now in need of Castor oil to top the overall oil percentage to 29%. Castor oil is all but non-existent here in Manitoba. Locally, I have exhausted all of my resources in trying to source anything. I called speed and race shops, motorcycle shops trying to find anything. I was asking for anything with pure castor, a Lucas product, or Klotz Benol, as they are the only two I am aware of by name. I did this with zero success at any of the shops. The hobby shops here (been to both) no longer carry Castor oil, only the synthetic blends, nor do they carry Sig fuel either so that is also out of the question. I have done some reading, and I am torn up on what to do next. I do realize that it will not be cheap, BUT, could I get away with pharmaceutical grade castor oil, as it is my last hope (ok, second as I am waiting to hear back from a possible performance shop to get back to me). Darn, $6 CAD for 3.3 oz/100ml. But at the same time, I do not want to ruin my new Fox 35! If anyone here has any other suggestions as to castor oil use that I may try to find locally, it would be greatly appreciated. Thank you.

Great Hobbies sells Sig castor . Mail order from them should be easy - no customs . Check under fuel .

Brad
MAAC 5418L

I race go-karts (for 45 years).

Do not put go-kart castor in your glow fuel, it's not the same, it's thinned down and usually has additives that will not mix well. You can order the right stuff from S&W Fuels or Sig. Also, do not put Sig castor in your go-Kart.

20% castor is plenty for a Fox 35. We race them 10 minutes at a shot fully leaned out with 20% castor and they live just fine so a 2/4 stunt run is a cake walk.

MM

Well I am waiting for another reply from the local supplier I had emailed yesterday.  He is going to see what he can do. Anxiously waiting.

McMaster-Carr has castor oil.  It works fine.  I don't know if they ship to the Frozen North.

The castor oil in Klotz benol is a thinned down version of castor oil. Bigger engines run hotter than model engines. If you put our pure modeling castor in a big engine it will coke up badly in a very short time which is why they thin it down. Also, Klotz benol has synthetic oil and other additives in it that may or may not mix well with glow fuel. Do not put go-kart/motorcycle oil in your glow fuel.

5% nitro 20% castor will be just fine for your Fox.

MM

Hi there. So I had finally picked up a gallon of Sig Champion 5%, All Castor Oil for my Fox engine (thank you Dennis for picking this up for me). I am now in need of Castor oil to top the overall oil percentage to 29%. Castor oil is all but non-existent here in Manitoba. Locally, I have exhausted all of my resources in trying to source anything. I called speed and race shops, motorcycle shops trying to find anything. I was asking for anything with pure castor, a Lucas product, or Klotz Benol, as they are the only two I am aware of by name. I did this with zero success at any of the shops. The hobby shops here (been to both) no longer carry Castor oil, only the synthetic blends, nor do they carry Sig fuel either so that is also out of the question. I have done some reading, and I am torn up on what to do next. I do realize that it will not be cheap, BUT, could I get away with pharmaceutical grade castor oil, as it is my last hope (ok, second as I am waiting to hear back from a possible performance shop to get back to me). Darn, $6 CAD for 3.3 oz/100ml. But at the same time, I do not want to ruin my new Fox 35! If anyone here has any other suggestions as to castor oil use that I may try to find locally, it would be greatly appreciated. Thank you.

If your  Foxes  are new or at least not full of burned on castor, you will be well served to use 28% oil in your fuel with 1/2 or 3/4 %  castor and  25 or 50% synthetic oil mix, they will work better and  last longer.
DO NOT  use  20%  oil, you will  kill the top of the rod, and put wear on the  engine much faster, plus it will  NOT  run as well.

I would check your Sig fuel.  they make all castor 20 and 25%  oil

Randy

This is the Benol you could get from Tower Hobbies. http://www3.towerhobbies.com/cgi-bin/wti0001p?&P=SM&I=LXS627  I don't know if there are other "Benol" products from Klotz, but you can always check the Klotz website.   

This "Tech Info" will tell you what you can mix with it: http://www3.towerhobbies.com/cgi-bin/wti0001p?&P=SM&I=LXS627#tech

However, since you have 25% castor to work with, I'd be thinking about adding enough "Klotz Super Techniplate" (which is itself 20% castor) to bring it up to 29% or 30% oil for your bench running, and potentially for further running. For future fuel, I'd try to get 10% nitro x 25% castor and again, add some Super Techniplate.

You can also get "Aero-1" lube additive from Randy Smith. I've used it quite a bit, typically in Wildcat Premium 10-18 R/C fuel, which has some castor oil in it...and is used in my ABC or AAC engines. I'd use it for break-in in any engine, especially a Fox .35.

I know George Aldrich used a test prop that was an 8x5, cut down from (IIRC) an 11" wood. Run it very rich to keep the rpm down to start with. Check Randy's pinned articles at the top of this forum for more info. I'd plan on using a 4-cycle/Big Bore Thunderbolt glowplug. You might need to keep the battery on for awhile...ideal place for a power panel/glow driver combo driven off a 12volt gel cell, if you've got one. When you have most of the gallon of fuel through it, it might be ready to fly, if you're careful to run it quite rich and run a 10-5 prop at most.    Steve