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Engine basics => Engine set up tips => Topic started by: Terry Caron on May 21, 2016, 04:26:25 PM
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I think there are a handful of variations - is this a desirable one?
Terry
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They're all good, Terry. That one looks like the standard iron/steel version they've been selling for years. Unusual to see it with a metal venturi instead of Delrin - perhaps someone converted it from RC?
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Could be a conversion, Steve, and it should nicely fill the hole between my .19 V and .35 III B.
Such a deal, I couldn't resist. ;D
Thanks.
Terry
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I bench ran it today and it started easily, turning a 9-6 APC to 12k on 5% nitro.
.8 oz heavier but, a la .20 FP BBTU (flat pitch/hi rpm), should do OK on a .35-size plane.
Pix of an NIB Enya .25 SS with the metal venturi insert make me think it's a factory stunt version.
Terry
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Terry,
The Enya SS25 w/o muffler is a bit heavier, but if you compare both engines with the stock muffler, the Enya is lighter then OS 25FP/LA
If you are planing to use this engine with a 35 size model, I suggest you try a 7.0 and 7.5mm venturi (both available from Enya) 10% nitro, 23~25% oil, APC 10.5x4.5 launching around 10000~10500rpms in a wet 2-2-2. Start with 60'~61' lines.
This Engine needs special break in, if you need help with that let me know. Many people give up on Enya engines with Iron Piston because with improper break in the engine will not develop good power, and in some cases it can cease during the first flights.
Martin
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And thank you for the encouragement, Martin.
I'm familiar with iron/steel engine break-in procedure, but don't know if I'll live long enough to complete it. LL~
It has the 7mm insert installed.
I'm surprised by (seems large for a .25) but accept your prop recommendation - of course, I don't have any. HB~>
I have a Flight Streak wing that might be a reasonable basis for a plane.
Terry
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An APC 10x4 works well on mine, and a 9x6 is also quite ok if you don't mind lapping a bit quicker. (I haven't tried a 10.5x4.5 on my SS25, but it's a great prop for the SS30 and 35-III.)
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Hi Terry,
It does not take a lifetime to break in an Enya Iron engine :) The way I do it, takes about one hour on the bench. This is the break in instructions I follwow :
10 runs of 1 min in a solid 4 stroke with the needle one hair open before it start to burble in 2. Let the engine fully cool before starting again
8 runs of 2min with the same setting
4 runs of 3 min same setting.
5 runs of 6 min with the needle in the same setting but this time pinch the fuel line to sustain peak rpm for 10s, then release the fuel line, wait 10s and repeat pinching process til the end of the 6 minutes run. Start pinching the fuel line slowly and watch the rpm to increase, if rpm goes down you went to far, back up a bit to keep it at the highest rpm it can hold. If you can, measure the maximum sustain RPM, you will notice that this number will improve. If after this process you still notice that the top rpm is still improving do a few more runs like this. If it sags when you fly, repeat this process a few more times. A very few engines comes to tight and these will take an extra 4 full tanks to do the job right. Never got one like this but some friends did.
If the engine is not ran at the peak rpm then it will take for ever to break in and to develop itīs full potential. Many people gave up on Enya engines because they thought the engine was weak, when it is quite the contrary.
With a Flight Streak/Enya SS25 I would try 9x5, 10x4, 10x5, APC 9.5x4.5 and APC 10.5x4.5 to see which I like best, all these prop will work. So far APC 10.5x4.5 seems to produce the best results.
I setup Profile models like this with 4Oz Sullivan RST plumbed for Uniflow and I mount it on the other side of the fuselage, I mean inboard side. This requires you to launch at peak rpm, as the engine will get rich when start flying. The nice thing is that with the fuel tank on the other side it will richen the mixture if the plane pick up speed and when doing the overhead maneuver the tank will be lower and the engine runs stronger.
Martin
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Great info, Martin, I'll keep notes for reference as I develop this project.
As you and Steve say, the proper prop is a fly-n-try proposition. ;D
Thanks again!
regards,
Terry