Paul Law Posted August 5, 2014 Share Posted August 5, 2014 I have an OS 46AX 11 engine in my Irvine tutor, before i run the engine, what type of fuel would you recommend ? Would i be safe enough running the same fuel (Cool power 10%) on the Tutor as i do in my heli's ? Cool power appears to be a lot harder to get these days, may be more prudent going for a fuel more easily found ? Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted August 5, 2014 Share Posted August 5, 2014 Yes Paul I've used cool power a lot, bekra 10 is good fuel as well John Quote Link to comment Share on other sites More sharing options...
Chris Barlow Posted August 5, 2014 Share Posted August 5, 2014 I use Contest 10 on my .46AX powered Boomerang if that's any help? Quote Link to comment Share on other sites More sharing options...
Hangar 9 nut Posted August 5, 2014 Share Posted August 5, 2014 Contest 10 on all my OS engines Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted August 5, 2014 Share Posted August 5, 2014 There's not much difference between Contest 10 and Bekra 10 - I think the biggest difference is the use of either Klotz Techniplate or Super-techniplate. I know that the Bekra is pure synthetic - no castor at all - as castor causes a lot of varnishing / silencer clogging on helis. In days of yore there was quite a lot of prejudice against pure synthetic oils in fuel, but I've run Bekra for years in the most demanding of circumstances without any issues. -- Pete Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted August 5, 2014 Share Posted August 5, 2014 Contest 10 in everything from Cox .049s upwards. Quote Link to comment Share on other sites More sharing options...
Keith Berriman Posted August 5, 2014 Share Posted August 5, 2014 I fly mine on Irvine 5% with no problems on a 11 x 6 have tried a 11.5 x 6 and it struggles Quote Link to comment Share on other sites More sharing options...
cymaz Posted August 5, 2014 Share Posted August 5, 2014 I think the most important thing is keep the fuel fresh by storing it carefully. Keep it free of debris , be clean when filling the tank and run the engine on the very slightly rich side. Doing that with any fuel should keep the engine happy what ever the make Saying that I use Prosynth 5% on everything! Quote Link to comment Share on other sites More sharing options...
Jon Laughton Posted August 5, 2014 Share Posted August 5, 2014 Most of my ic engines are OS: I used to use Model Techincs Duraglow 10% but after a few inexplicable deadsticks I was advised to change to Westons Prosynth 2000 10% and it was a great call..... Quote Link to comment Share on other sites More sharing options...
aidan mcatamney Posted December 3, 2021 Share Posted December 3, 2021 On 05/08/2014 at 20:35, Jon Laughton said: Most of my ic engines are OS: I used to use Model Techincs Duraglow 10% but after a few inexplicable deadsticks I was advised to change to Westons Prosynth 2000 10% and it was a great call..... In the early days, the 1980s, I used nothing else only Duraglow by Model Technics. But for the last 10 years, all I use in both two strokes and fourstrokes is Optifuel 12. This fuel runs all my engines without any hint of trouble. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted December 4, 2021 Share Posted December 4, 2021 Not much choice here in France, only 3 makes to choose from, whatever they are I put 2° caster in them and the rest synthetic oil to bring it up to 17% oil, and 10% nitro, I run all of my stuff on it, from my HP.21 vt / Saito 120 four strokes to my two strokes, Irvin, Os and up to my .90 rossi not forgetting my helicopters OS .50 hyper and Novarossi .61,,, Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted December 4, 2021 Share Posted December 4, 2021 I run my OS55AX on Southern Model Crafts 0%, runs really well. Quote Link to comment Share on other sites More sharing options...
John Stainforth Posted December 4, 2021 Share Posted December 4, 2021 I'm another fan of Optifuel 12. Frank, have you tried your OS55AX on 10, 12 or 15% nitro? Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted December 4, 2021 Share Posted December 4, 2021 1 hour ago, John Stainforth said: I'm another fan of Optifuel 12. Frank, have you tried your OS55AX on 10, 12 or 15% nitro? No, I have a stock of straight synthetic and it runs really well on that and is perfectly powered for my Astro Hog, so don't need to go to the expense. It's only been flying for 3 years in this plane which is probably about 120 hours running. The AX series are really good engines. Quote Link to comment Share on other sites More sharing options...
aidan mcatamney Posted December 4, 2021 Share Posted December 4, 2021 10 minutes ago, Frank Skilbeck said: No, I have a stock of straight synthetic and it runs really well on that and is perfectly powered for my Astro Hog, so don't need to go to the expense. It's only been flying for 3 years in this plane which is probably about 120 hours running. The AX series are really good engines. I have two 55ax engines and they run very nicely. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted December 4, 2021 Share Posted December 4, 2021 10 hours ago, Frank Skilbeck said: I run my OS55AX on Southern Model Crafts 0%, runs really well. Years ago at my club, we all used Straight Fuel for everything. The motor gerus warned us of using nitro added fuel as it " rots your motors " they claimed. Times have changed, and we all run motors dry etc, at the end of the day, but all motors will run on Straight Fuel. Quote Link to comment Share on other sites More sharing options...
Jon H Posted December 4, 2021 Share Posted December 4, 2021 More nitro will mean more rust to be fair, especially in a 2 stroke. Given the cost, rust, mess, and fuel consumption disadvantages of high nitro fuel i wouldnt recommend more than 5% for anything to be honest. YS are another story, and heli's use the fuel as coolant so that too is different, but for general sport/scale/aerobatic flying it will make no meaningful difference to the performance of the engine once tuned to suit it. Quote Link to comment Share on other sites More sharing options...
Keith Berriman Posted December 4, 2021 Share Posted December 4, 2021 I can confirm all my 46 AX. Mark 1 & 2 ran excellent ly on Laser 5% tick over through to full power no problems 1 Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted December 5, 2021 Share Posted December 5, 2021 13 hours ago, Denis Watkins said: Years ago at my club, we all used Straight Fuel for everything. The motor gerus warned us of using nitro added fuel as it " rots your motors " they claimed. Times have changed, and we all run motors dry etc, at the end of the day, but all motors will run on Straight Fuel. That's not the reason I do it, it's more to show the guys who insist you need 10% nitro to get a good starting, idle and pick up, my OS55AX when properly primed starts very easy with a back flick, takes a few flicks at the start of the day but then usually one or two on subsequent flights. I have recently started adding 25% neat methanol to reduce the oil content a bit, so far the engine continues to start and run really well, but I haven't really seen any less goo on the model ? Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted December 5, 2021 Share Posted December 5, 2021 Nitromethane does provide a noticeable power boost but needs much less air to burn than methanol, increasing the rate of fuel consumption for the fuel mix and I suspect that the “easier handling” claims have much to do with the increased volume of fuel being metered by the crude carburettors we use, making adjustments a little less critical. Quote Link to comment Share on other sites More sharing options...
Maurice Dyer Posted December 6, 2021 Share Posted December 6, 2021 Southern Model Craft 5% synthetic in everything. Contest 10 is so expensive. Quote Link to comment Share on other sites More sharing options...
Neil67 Posted January 24, 2022 Share Posted January 24, 2022 I have an OS 46 in a Boomerang that I use as winter hack. I use Weston Liquid Gold 10% in the Boomerang and other similar models. Never had a problem, good price and excellent service to your door. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted January 24, 2022 Share Posted January 24, 2022 It will run just as well on the 5%, and you get a free bottle of wine. Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted January 24, 2022 Share Posted January 24, 2022 Could you post a picture of the engine as is please Many many years ago I used some liquid gold fuel in a magnum gp40 which ran well. After a while the engine would get gruby with an orangey brown stain that got worse and worse. This muck was extremely difficult to remove, much more difficult to remove than castor gooo, even baked on castor goooo. This gooo was very similar to the gooo found on a deep fat fryer we were given. But that was over 25 years ago Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.