Author Topic: Do I need to add castor and how much to Omega fuel (Read 2418 times)

Matt Piatkowski · « **on:** June 16, 2015, 11:51:19 AM »

Those of you who read my previous posts know that I have Jett 60. This engine, customized in 2000 by George Aldrich, died suddenly ( almost zero cold compression) in the Summer of 2014 and received the face lift from Dub Jett. "face lift" included new Ro-Jett liner, head button, piston and venturi. Dub suspected that rust damaged the liner-piston fit but this was never proven.

I have easy access to Omega fuels sold in every hobby store in the Toronto, Canada, area. Other fuels are not easily available here.

Each time I buy a new gallon, routinely with 10% nitro, I add some castor to bring the total oil content to 21-22% oil. This was recommended by two good stunt flyers from my club using Jetts ( 65 and 90 ) and I followed this advice.

When my Intrepid XL ( equipped with Jett 60 ) flies, it leaves a very heavy smoke trail. After landing, the rear part of the fuselage and tail are covered with thick layer of partially burned castor and this is annoyingly messy.

Do I need to add so much extra castor to Omega 10% fuel?

Can Jett run ok, get enough lubrication and cooling on stock Omega?

I do not want to overheat or damage the engine but all this spewed castor is, like I said above, annoyingly messy.

Thanks,
Matt

Steve Helmick · « **Reply #1 on:** June 17, 2015, 05:29:02 PM »

Morgan apparently measures their fuel components by weight, instead of volume. We rather expect it to be measured by volume, as most mixers do it, and we have been accustomed to the use of volume to measure fuel components. Nitro is heavy, alcohol is light, oil is somewhere between. What it works out to is about 14% total oil by volume. Might work for R/C, with throttle often reduced and an easy flight abort.

Morgan says Omega is 17% oil, with 30% of that being Castor and 70% being synthetic. There's the problem. You might try adding Klotz instead of castor. The "RO-Jett" mix from Powermaster is (I think) 5% castor and 15% or less synthetic...but I've never bought or used it...and can't find the VP/Powermaster website. Might try a search on Stunt Hangar for the percentages, or just call Dub or RO.

This is a very nice feature of tuned pipes. Mine squirts about 1/4 teaspoon of castor on the outboard side of the fuselage, under the stabilizer. I'm using 10-18 Wildcat Premium with an ounce of Randy Aero's "Aero-1" added. Wildcat sold out to Byron's. I'm not sure what the exact %'s of castor and synthetic are...speculation is 20% & 80%; info which comes from the Klotz "Super Techniplate" KL-100 blend, AFAIK. You can get the KL-100, KL-200 and Klotz "Benol" castor oil in quarts from Tower Hobby.

Steve

Author Topic: Do I need to add castor and how much to Omega fuel (Read 2418 times)

Matt Piatkowski

Do I need to add castor and how much to Omega fuel

Steve Helmick

Re: Do I need to add castor and how much to Omega fuel