OS 15 and 25 LA (Silver)

Ken Cook wrote:Dennis from Brotherhood of the Ring  is a very knowledgeable and generous person. He's also a amazing builder. The amount of planes he's produced in the past year exceeds anything I've done in ten. I suppose being retired does have it's advantages. I've enjoyed many flying sessions with him not to mention phone calls. Dennis has stated to me many times that now would be the time to gather some of the desired OS engines we use. The .15 and the .25 LA.

I tend to agree that these engines are not long to be in production. We both agree that electrics have essentially bombed nitro back into the stone ages. OS has already pulled the plug on some of the LA engines already and these smaller mills have had their time. The LA .15 has been my staple engine in clown racing . Our rules state as many laps in 7 minutes not to exceed 140 using 1 oz. fuel tanks.  The 140 lap time was moved to 140 laps when a Moki .15 rear exhaust dominated the circle. This left the already challenged LA sport engine which was considerably down on power to try and even come close. Many of us considered this a challenge including myself. I had taken the loser circle for the past 4 years. My continuous efforts playing with props and plugs not to mention head clearances finally paid off this year. I was disqualified for exceeding the 140 lap. I went from 131 laps to 146 laps. This had heads turning and several looking at my equipment. This also had many believing that this was an error in counting which now several other insisted I do it again. I did do it again and even with two not so good pits left me with 142 laps.

We turn a exceptionally small prop on break in on the LA .15. We break the engine in at 24K for 2-3 minutes. This practice can result in a LA .15 that doesn't always want to run again so I don't recommend this for those with personal attachments to their engines. The .25 LA is a staple engine to us in the Northeast using Phil Cartier planes. They run exceptionally well on 8x4 props and just take one heck of a ground pounding. While some are not fond of the plastic backplates, I found them to be quite reliable . I use two specifically for speed limit and the others for stunt. They really have a wide variety of useage. Ken

Surfer_kris wrote:I have somewhat mixed feelings about the OS engines. They are easy to use but their liner coatings seems to be thinner or weaker somehow compared to the competition. Here is what an OS .10FP looks like on the inside after some use, the compression is still fairly good but the nickel is falling off.... ;