Engine for my Viper?
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Engine for my Viper?
I have two set up for Q25 racing, and a spare.... Engine choices I have are .... TT.40 Pro ... Webra Speed .40 ... old Super Tigre .45, the round/6 bolt head. What do you recommend? Prop size and quess on speeds?
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Will the TT be faster than the Webra? This one won't be used for any racing, looking to go as fast as it can, with what I have. I thought maybe the ST .45 propped right would be the fastest.
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if you can work on the engines then you should. With some mods you can get 17,000 with a APC 9x8. open up the carb, exhuast port, might have to lower the sleeve, and might have to mess with the crank timing. now if you dont want to do that then a great option is to sell them and buy a newer super tiger 45 from tower and order a "black" jett muffler. this combo stock will spin a 9x8 APC prop 17,000. this will pull that plane around 130-140.
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I had a new ST .45 on it a few years ago with a red Jett muffler and a little work, and it went low 130's I got rid of that engine when it started losing some compression, and made all of them Q25 legal. I have an UltraThrust muffler for the Webra, I think I'll stick that on it for now. I don't really want to buy anything right now.
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Speaking of which, if I can slightly hijack for one question - I know APC's "190,000/dia" rule, that suggests the Q500 props are good for up to about 21.5k. In practice how fast do people consider them safe in use?