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Type: Posts; User: Mr Cox

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  1. The pipe sounds a little too short in the movie...

    The pipe sounds a little too short in the movie to me...
    It sounds like the engine is almost getting onto the pipe sometimes, as it surges a little, but it doesn't quite manage to stay there?
    ...
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    The engine is in an control line, CL, plane....

    The engine is in an control line, CL, plane. There the centripetal forces dominate over gravity, and moving the tank outboard will have a similar effect as to moving it downwards on an RC plane.
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    No problem, no offense taken. It just seems to...

    No problem, no offense taken. It just seems to often become a rather heated topic...

    The link explains it quite well I think, and it should be a trustworthy source too.
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    A lapped engine needs to stay tight, you don't...

    A lapped engine needs to stay tight, you don't want to have any excessive wear, it should only be just enough for a tight seal and then heat and work harden the surface to keep that fit. The piston...
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    This sounds more like an old-school ringed engine...

    This sounds more like an old-school ringed engine break in to me.
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    Excessive long and rich runs of these engines...

    Excessive long and rich runs of these engines will only wear out the engine prematurely, so there has to be a bit of a "feeling" for the engine involved. The initial rich run is there to mate all the...
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    I think I bought it from rcflight.se (it's 2 or 3...

    I think I bought it from rcflight.se (it's 2 or 3 years ago) but they seem to be out of stock now.
    You might be able to get just the drawing from here; http://www.modellproduktion.se/
    That would be...
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    I made some 2" racing wheels and an aluminum...

    I made some 2" racing wheels and an aluminum landing gear now, with a weight of 34g (1.2oz).
    So the total weight now, including landing gear, is just shy of 20oz and it should still do well on a .10...
  9. That was with 10% nitro and 20% all castor. With...

    That was with 10% nitro and 20% all castor.
    With a second engine I've seen around 18200rpm on the APC 5.7x3 and the same fuel. That was after some rework though, which included sealing of the porous...
  10. I thought the CS were long gone too, I wonder if...

    I thought the CS were long gone too, I wonder if they are actually making any engines or merely selling old stock...

    I found the link to a short movie of the sports engine that I posted when I was...
  11. Have you tried any of the read head sport engines...

    Have you tried any of the read head sport engines yet?
    The quality is very low but if you're lucky they can fly something after some rework...

    The "speed" ones also came in two versions, one for...
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    I think they run best with a 7x4-7x5 or slightly...

    I think they run best with a 7x4-7x5 or slightly larger loads. Should spin around 14500rpm on the 7x4 as I remember it.
  13. Thread: OS .15 mods

    by Mr Cox
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    The GP series from Thunder Tiger is a bit of a...

    The GP series from Thunder Tiger is a bit of a dissapointment I think, the BB Pro version are better but they only make, or rather made, them in larger sizes.

    The older classic cross scavaging...
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    An 8x4 is a fairly low load, and with the low...

    An 8x4 is a fairly low load, and with the low pitch it will also unload a lot in the air.
    I suggest trying with an 8x6, or even 9x6 instead and see if that changes anything
  15. Thread: OS .15 mods

    by Mr Cox
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    There have been report also of misaligned exhaust...

    There have been report also of misaligned exhaust ports and restrictive mufflers. Japan man worked and wrote about that sometime ago. On my engine the muffler didn't have any baffles and there was no...
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    I don't know how it can go lean, overcompressed,...

    I don't know how it can go lean, overcompressed, and missfire all at the same time, something doesn't add up...

    It could well go lean and missfire, but it cannot go overcompressed at the same...
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    That fact that it runs hot just shows that it is...

    That fact that it runs hot just shows that it is not "happy", I think. It is not necessarily any evidence of a too lean setting...

    The compression ratio and fuel ratio are linked inversely, i.e. a...
  18. Thread: OS .15 mods

    by Mr Cox
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    The Norvel is stronger than the OS... ;) The...

    The Norvel is stronger than the OS... ;)

    The stock carb is very restrictive on the Norvel. The actual bore is fine but the spray bar in the center is comparatively large. This give a great idle...
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    Sounds more like a tank position problem, you...

    Sounds more like a tank position problem, you could try putting it further out?
  20. It sounds similar to the results I had with the...

    It sounds similar to the results I had with the APC 7x4 then. The engines turns similar rpms to an open exhaust configuration and it never gets on to the pipe, don't think that it really can do that...
  21. Yes, my figures are with 10% nitro and 20% all...

    Yes, my figures are with 10% nitro and 20% all castor in the fuel.

    I wouldn't trust everything you can find on the web, if it sounds too good to be true then it probably is...

    +18000rpm on a...
  22. How much of an improvement did you see on the OS...

    How much of an improvement did you see on the OS .10?

    With the stock timing on the OS .10 FP I have not seen any gain over an open exhaust by using the MACS tuned pipe. I got much better results...
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    Please do make a build thread on it. I have had...

    Please do make a build thread on it.
    I have had this one on my to-do list for a long time...

    If you put the engine in a 90 configuration it can look quite good. The cylinder can then be hidden...
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    Ahh, sorry I missread that completely.... Only...

    Ahh, sorry I missread that completely....
    Only the receiver behind the CG then (?) and the battery goes under the tank?

    On all my latest builds I've ended up with the battery behind the wing, so...
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    How much was that NiCad in weight, around 2oz? ...

    How much was that NiCad in weight, around 2oz?

    You can easily balance all that off by a much smaller weight which is positioned right at the very tail end. So I wouldn't worry too much about it, a...
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