Engine for pylon training
10-28-2020 | 04:46 AM
#51
Thread Starter
Whisky, Here's another suggestion. It looks like all but one of the engine set ups on the pictured airplanes have traditional motor mounts. It also looks like they are black "fiber filled nylon" engine mounts. If your rules will allow it, I would recommend he backplate type mounts, or aluminum beam motor mounts. The more rigid your engine is mounted, the more power it will make. The plastic mounts flex more then the aluminum mounts. We also have rear cover back plate mounts for all the engines, but I assume that your rules would disallow them, because they aren't straight "out of the box". I definitely am in agreement with Sparky on the bladder tanks. Tetra, and Jett are the most popular. They allow you to lean the engine closer to peak RPM, and then they don't lean out after 5 laps. Also, most of use a 4 oz. tank in our 424 Quickies.
Those planes are friends, except the yellow one. My seeker already use backplate mount , a friend lathe it for me.
Using bladder tank, how much rpm should I back up?
With regular tank, I backup a few clickts and lift the plane 45 degree, if there is no pitch change at all then i am set.
I have to admit, the subtle pitch change would be difficult to hear when others are running their engine side by side but I got used to it already,
those other Q5 planes, they always set it up too lean on few first flight.
I will definitely run bubble-less tetra, However, I need to practice filling it first, to get use to filling it properly, without bubble
10-28-2020 | 05:02 AM
#52
My Feedback: (6)
Whiskey,
I just sent a PM about the engines send me a email on my gmail account. No big issue with fueling a bubble free tank (BFT) . The tanker is handy but not required you need a syringe that will hold about 5-6 oz total.
Dub Jett model aircraft engines- Jett Engine Saftey and Technical Documentation this 3 minute video will explain everything you need to know about BFT
You will NOT pick up any rpm using a BFT. It will allow you to dial the needle closer to peak and it will stay there until the tank is almost empty before the mixture changes.
Sparky
I just sent a PM about the engines send me a email on my gmail account. No big issue with fueling a bubble free tank (BFT) . The tanker is handy but not required you need a syringe that will hold about 5-6 oz total.
Dub Jett model aircraft engines- Jett Engine Saftey and Technical Documentation this 3 minute video will explain everything you need to know about BFT
You will NOT pick up any rpm using a BFT. It will allow you to dial the needle closer to peak and it will stay there until the tank is almost empty before the mixture changes.
Sparky
11-01-2020 | 01:46 AM
#53
Thread Starter
Whiskey, The basic Jett Quickie .40 is $260.00 + $38.00 for the backplate mount. For a long time the only way it was available was for our 426 Quickie event. Then a year or so ago, Dub made the "detuning" parts available so we could use the engine in our 424 event. If you have the 426 engine, the 424 parts are $35.00, but you can buy the engine configured for the slower event, and then if you want to, you could get the 426 muffler, and venturi. For our 424 Quickie event there is only one prop option, the APC 9/6, so there is no reason for us to experiment with other props. In 426 we use stock unmodified APC props. One example is the APC D-1, 8.8 X 8.75. I believe there is some benefit to practice with something that is faster then your actual race planes. Some things like your race timing will be different, but being able to negotiate the race course with the faster airplane translates in you having more time to master the race course with the slower configuration. If money were no object, you might consider the Jett 426 for practice. I still go back to my earlier recommendation that a Thunder Tiger Pro .46 if you can find one new or used, but not abused. Another option, but harder to find, would be a used Nelson short stroke 428 motor. That event is no longer flown in the US, so sometimes these engines come available on the used market like Ebay. Finally, and this is important, if you bump up the speed with a 426 Jett, or a 428 Nelson be certain that your wing is strong enough to withstand the higher G loading. The Italian Super Tigres were great engines, but they are probably harder to find ones that haven't been run to death.
