stunthanger.com
Engine basics => Engine set up tips => Topic started by: Robin_Holden on February 14, 2013, 04:23:18 AM
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Greetings fellas from a pretty damp Charente in S.W.France.
Started flight testing with my Evo 60. Findings are as follows .
She seems to perform best with the following set-up :
Fuel : A French brand called 'Rocket Fuel' . It's a synthetic mix but they don't mention the percentage. I 'assumed' an 18% mix so I added Castrol 'M' to take the overall lube' mix to 20%. I've found this fuel to be excellant quality .
Prop' etc : After a lot of experimenting I've settled on a TT 12.5 x 5.5 , launching at around 8,800 rpm. In the mild weather conditions here yesterday , around 9/10 degrees , the needle setting was at around 5 and a quarter turns open.
I was circulating at around 5.2 secs on my 65 foot lines.
Evo tongue muffler with NO exhaust pressure.
Just as an aside the model was a profile ship , based on an excellant article written in CLW a couple of years back by Bradley Walker. Well worth a read.
Briefly to remind colleagues , he suggested using a large engine , say a 60 , in a smaller say 40 sized 'plane as long as there was NO weight penalty . He advocated using the 60 size engine in a 'deep' low RPM setting .
The plane I am using has around 580 sq. inches of wing area weighing in at approx' 47 oz . Wing loading therefore around 11.8 oz/sq.ft. She loafes around , not too much pull on the lines and even a really lousy pilot like me can cope .
Just to finish , the Evo [ in my very amateur opinion ] represents great value for money. It's docile , a second flick starter , dead easy to set up out of the box once run-in . Just fit the smaller of the two venturis supplied and bingo !
End of plug for the Evo 60 , supplied as usual with polite efficiency by Randy.
Regards from the Charente ,
Robin [ ex-pat Brit' in the Charente full of ex-pat Brits' ]
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Hi, Robin, thanks for the excellent report. I, too, believe the Evo 60 is a nice stunt engine...easy to set up, easy starting, with good stunt power. Hope to see more of these flying this season!
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It just so happens that I have a TT 12.5 x 5.5. and an Evo 60. I will give it a try. Thanks! 8)
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TWO flips! Why is it so hard to start? What's your starting "drill"? ;) Steve
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TWO flips! Why is it so hard to start? What's your starting "drill"? ;) Steve
Steve , good morning.
What's my starting 'drill' ?
Same as usual .... A couple of flicked chokes, on with the plug igniter and she'll start up after the 2nd flick ....Uusually !
Oh I forgot to mention in my missive the following fellas.
The Evo is very relaxed regarding fuel ! I have used an all castor 80/20 brew without any problems.
Just a different needle setting , around 3 and a half turns open on the needle.
Robin.
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TWO flips! Why is it so hard to start? What's your starting "drill"? ;) Steve
Probably not broken in yet. Based on the Evo 36 after about 1 gallon it starts to come alive then gets even better. Less vibration too. I was getting 1 flip starts choking 3 times after the finger gets wet and 15 times no choke, connect battery and get a bump then flip. Green Cool power worked well for me.
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I am using a Xoar 12x6 prop on a 74 oz plane. About 82 to 83 hundred RPM gives good lap speeds and great engine runs.
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How much fuel does your Evo 60's use for the pattern?
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Hi, Stan, with the smaller venturi, we're using 5.75 ounces of 10% nitro, regular Powermaster (17% total oil). No muffler pressure, uniflow
metal tank. Nice, soft 4/2/4 break, very repeatable.