A local hobby shop has 10% Wildcat Fuel that I was going to run into a LA46. How much castor oil would you add to a gallon for that engine? They list having Omega but I never see it there. They also have Cool Power. I didn't see snyone running Wildcat in "list your La46 set up".

IIRC Wildcat is 18% total oil -- I can't remember if it's all synthetic or a blend.

At any rate, if you're running an ABN or ABC engine, you should be able to get by if you bring the total oil content up to 22%.  You can do this by adding one cup (8 ounces) of castor to the gallon.  It gets pretty close if the stuff is 17% total oil.  One cup should fit in the free space at the top of the jug, and it's easy to remember.

Folks say "don't use medical-grade castor!"  I don't know why, and I've used it.  But it's hugely expensive.  If you're going to do this a lot it's probably worth it to buy a gallon or two of castor from Sig to have on hand -- you can top off a whole lot of gallons of cheap fuel with a gallon of castor.

Would you run Wildcat in your LAs? One of my 46s the piston has a black tint to it, good bad ugly?

 

the jug of wild cat 10% nitro that i have has 16% oil, 80 syn & 20%caster

Wildcat 10% Nitro,  Premium Xtra is 18% oil, 80% of which is synthetic the rest castor.  Opinions vary but, I've been using it in my ABN, ABC engines without any extra castor oil.  Unless my LA's are different (kinda doubt it) they run just fine.  My RoJetts have all loved it.  In warmer weather I jump to 15%.  Don't believe me?  Come to Portland this weekend.

Ok hobby shop has the Omega an asked if I wanted Wildcat with or without castor but they only have the Wildcat without castor. Sooooo go with the Omega an add castor into that

Or you could be like Mike.  I started adding castor to my fuel because the engines seemed to be happier with it, not because it's needed to make them last.

Mike was outflying me at the time, and even though he's gone over to the well-lit side, he still outflys me.

What does going to 15% in warmer weather do? I would think that would make them run hotter... Portland is kind of far for me or I would to learn a thing or fifty.

Read Randy Smith's pinned post in the Engine Setup Tips forum -- in a nutshell, you set up the venturi size, prop, etc., for the run you want, and then when you need more power (i.e., in the summer when the air is thinner) you boost the nitro.

You can add castor if you wish, I tried it and caused inconsistencies for me. 

I tried not using castor, but when I added castor the inconsistencies went away.

There's a lesson in there someplace, if only I were smart enough to figure it out.

Well... the premium xtra the hobby shop stopped ordering cause Byron bought them an raised the price. They checked for me to order is but its out of stock. Sooo back to either Cool Power or Omega i guess. Any different set up for Omega?

In my opinion the most important thing is to use the same thing every time.  So pick something and only change because you want to.

I order cases of GMA from my LHS; as long as he sells an order of fuel often enough that my case doesn't run out, I'm golden.  When I can't get GMA I'll get cases of something else, and doctor it up identically if it's something like Omega.  The last thing I want to do is change fuel right before a contest.

Would you still put a cup of castor in the Omega an go from there?

I've been running Wildcat 10% Premium Xtra for several years now. Like Mike Haverly wrote, the Wildcat Premium Xtra has castor in addition to the synthetic oil. It's also pink, but I haven't seen any discoloration on my plane, if that is a concern. The only engine I've run it in is an OS .46VF AAC. If I was going to run it in a .46LA, I'd add castor to bring it up to 22%-25% oil, and more like 30% for old technology engines (McCoy/Fox, etc.). 

There used to be a fuel modification calculator on the TGD site, but I can't find it anymore. Has it been moved or is it just gone?     Steve

Would you still put a cup of castor in the Omega an go from there?

You should put at least 9 to 10 ounces in OMEGA, Morgan fuels, like Byons  is measured by weight and not volume, so the oil percent is slack

Randy

Fuel mixture calculator.

http://www.nitrorc.com/fuelws/oilonly.asp

ON the recommendation of many who have decades more Fox 35 stunt experience than I

I blend to have 3%~%5 synthetic and 25%~28% total oil using Castor

But I suspect a lot depends on if a new in service engine vs one with 4 decades of 100% Castor running

I have Never experienced this, ( with my low Synth %) but the web mentors caution that a well worn Castor only engine now fed  synthetic (don't know how much) will clean off the Castor varnish and further reduce piston seal

I know several across the web forums who claim they use 50/50 Castor synth with no problems in their Iron engines

I recently put a NIB Green head Torp and Two NIB Fox 35S in service for first tiem

I blended for 15% N and 25%total oil using 3% UCON LB625 synth. Unless I have trouble I suspect is fuel related I intend to use this blend on these three for their life with me

I don't compete and should not have to adjust % N for weather or altitude

I tried 5%N and 10%N and found that with my plug and prop choice they start and needle better with the 15%

Your best bet is take a trip to brodak and get your fuel there. You are close and could get it on a saterday, and I think the club flys that day, you could give them a call. I have use brodak fuel  and it good fuel, it's made by s&w.

Steve