I've go a Thunder tiger .25 pro that will not run for more than a minute at a time. The simptoms are if it is just a bit rich it will run normally to a point then just quit, like someone hit the kill switch. When leaned out to a good setting for level flight, and passes the pinch test, it dies as soon as the vertical test is tryed. I've put feul tubing around the needle and it got me to what I've just described.

I'm thinking I've got to be sucking air somewere in the carburator. twards that end I'm going to try it the next time with a OS Max .25 FP carb the next time out. What are your thoughts?

I have heard the carb on the bb.25 TT is junk. I bet it will work with a different carb.

I have two TT Pro.25 that I bought when first trying combat. Put them on two Predators. One did better than the other, but both were dogs compared to the OS FX and Norvel. I bought OS 40 FP carbs from a guy off the web and they were better, but still not competitive with OS/Norvel. Finally bit the bullet and bought 2 Norvel--lots of power, but lots of headaches also. I put a mouse can muffler on one of the TT's and use it on a PBF just to knock around with--it will hover ok, but I don't have quick enough throttle to tail touch. Dang thing keeps flopping over, or laying down. Still a blast to fly, though.

In summary, the TT Pro.25 is not a very competitive engine, even when running well. I have kept one for back up on an Open B rudder plane, but much prefer my Norvels.

Good luck.

Greg

Gregg, thanks! I've got about four hours in trying to get this peice of ____ to run. I've not had much luck lately with my combat planes my preditor of two years, as many midairs and numorus combat rounds lost a servo this march. When the servo quit it went to full travel and I'm sure you know the rest. The plane and engine was unharmed, so two new servos and back in the sky. Because we run a "beginner combat" we have limited engines to .25 FP or LA (no other 25) or anything smaller. All the beginners feel comfortable while they learn to spread the field of their vission. Any ways to try to find an engine I could put on my preditor to be legal I started with a MVVS .21 and it ran great as long as I did not turn climb or dive. Then I tryed a old FP that had been damaged in a mid-air and that was NG. So as a last resort I had always kept this TT.25 pro as a third backup. I put it on, and the rest you know about.

The os 2a carb I'm using will has been bored out to .25 in intake dia. and the .25 fp would really hum with it so I'm hoping it will do the same for this one. I'll find out tonight!

The MVVS is obviously loosing air from the seam between the cylinder and the case of the engine. I took it apart last night and there was oil al over the nice machined mating surfaces. So if it were a air tight seal there sould have been no oil there eather. so now the search begins for a sealant that is alcohal and nitro methain proof. Anyone got a saggestion, besides hold the MVVS over a garbage can, close my eyes and release.

Thanks
Joe

Joe:

How goes it with the TT .25? Our club, Hawks in Hamilton, OH is getting more into SSC. We have an event in October that will be all SSC so I just bought a second LA .15 which is the prefered power plant. The Tuff Flight boys have a new design, looks like a Predator but they call it something else, that comes with two engine mounts. The plan is to be able to switch at the field between .15 and .25. I love my Predators, and may buy one of these for SSC--made from spongy foam, it should be indesctructable.

Greg

Greg, The OS FP or LA carb worked and the engine runs great, The carb fit right in the hole of the POS that came with the engine. The engine was a bit tight at first but with seven flights on it it is starting to run very nicely.

We ran our first beginner combat on 27Jul03 (the first on got rained/washed out) we had five (new combatants) all flying LA .25's in spads, and Bill Tozer and myself running Preditors mine with the engine discused above and Bills with an engine that was made up from two engines (one with a cracked case and the other with a shattered con rod). Trying to avoid collitions we used 20ft string and 50ft streamers and they all got taken off in the second round. First round we put just the new guys up against each other and plan problems soon had it dow to just two. Our Preditors were slow compared to the Spads, Mine with the hotter (illegal engine) was as fast as the spads. Our rules are simple LA or FP .25 is the larges engine alowed, anything smaller is allowed. Rule number two everyone fly's legal or not and if they do to well with a illegal engine at the end when they start braging we call them a cheeter, and they could not repeat it with a leagal engine (you know the usual banter). Everyone had a good time, we had one mid air and one loss of control but damage was less than $20.00 worth.

We plan to hold one more prior to our RCCA combat meets on 13 & 27 sept and hopefully some of these guys will give that a try.

Joe