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Type: Posts; User: Mr Cox

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  1. Replies
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    I think The Magnum/SC .15XLS is a better engine,...

    I think The Magnum/SC .15XLS is a better engine, than both the OS .15LA and the Magnum .15 that this thread was originally about.

    I think that the file below might have the sought after...
  2. I guess an owners club thread can never get too...

    I guess an owners club thread can never get too old. ;)

    Here are two different versions of the X.11 engines. The pretty blue heads ones are no good, but the the plain heads ones are great. They...
  3. Replies
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    4,179

    The VA MkII feels much better than the MkI. In...

    The VA MkII feels much better than the MkI. In terms of power the difference isn't very different to a regular Norvel .049, to me, but the handling is much nicer. Very easy to handstart and throttles...
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    154

    I don't use any high nitro fuels myself, because...

    I don't use any high nitro fuels myself, because of the high cost, and on 10% Nitro it is no easy task to get out .5 hp from a .15 engine, in my experience.

    Below is a plot for a few (three)...
  5. Replies
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    154

    The power curve seems to peak well below .40hp at...

    The power curve seems to peak well below .40hp at less than 19000rpm. So there is no point in propping them for something above that in the air?
    More nitro may well increase the power output but I...
  6. Replies
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    159

    There is another problem I had when bench...

    There is another problem I had when bench running, the throttle will go well past full throttle...

    Once in the airplane with the screen off, one can easily use the servo endpoint to adjust for...
  7. Replies
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    159

    Here are two mods that one can do, I thought it...

    Here are two mods that one can do, I thought it would be too much to do them both but it turns out that the description is pretty accurate;
  8. Replies
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    The OS .10 could work fine in terms of weight I...

    The OS .10 could work fine in terms of weight I think (depending on the model, the later ones are heavier than the FSR). With the Norvel engine I have to put the battery right up against the firewall...
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    The MVVS .15 (RC) will spin the APC 6.5x5 at...

    The MVVS .15 (RC) will spin the APC 6.5x5 at +22000rpm (with a tuned pipe), this is about 0.5hp in terms of power, I think.

    I think it will take a Cox Conquest (with open exhaust) to get out those...
  10. Replies
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    159

    You might have to check the reed valve if it has...

    You might have to check the reed valve if it has been sitting for a long time without being used.

    The carb needs a low end-compensation and then it works okey at least. You can do this by making a...
  11. Replies
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    The first one looks like a "Space Bug" without...

    The first one looks like a "Space Bug" without the tank part or possibly butchered tank.

    The engine with the spinner looks like a Thermal hopper with the stock backplate from Cox.
  12. Replies
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    159

    Yes, the APS .12 are very nice engines, they are...

    Yes, the APS .12 are very nice engines, they are set-tup for low nitro and small props. The true ABC technology and dual needle makes them a little nicer than the OS .10 engines. The X.11 are a ...
  13. Replies
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    159

    I took the head off on one of my "spare" engines...

    I took the head off on one of my "spare" engines with plain head. It is very similar to the BB ones. The head does not protrude into the cylinder and there is a squish band etc. It looks like the...
  14. Replies
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    159

    I don't think that the plain heads, non BB, will...

    I don't think that the plain heads, non BB, will fit either. They really changed the design a lot from the first blue head ones. The blue head protrudes a lot into the cylinder and there is no squish...
  15. Thread: My new engine

    by Mr Cox
    Replies
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    131

    Would love to hear one run... :)

    Would love to hear one run... :)
  16. Replies
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    1,573

    The trick is to clean the plane well at the...

    The trick is to clean the plane well at the field, and to leave the rags there too...
  17. Replies
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    1,143

    I still don't see any real problem, it just...

    I still don't see any real problem, it just sounds like it is set too lean, have you even touched the needles?

    If the needles were not needed, they would simply have omitted them from the...
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    I take it you haven't touched the carb settings...

    I take it you haven't touched the carb settings at all?

    The needles are there to be adjusted on, there are so many things that affect the fuel delivery that you of course have to optimise the...
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    1,573

    I think there is very little "challenge" with the...

    I think there is very little "challenge" with the electric stuff in practice, it is more a matter of wallet "size".... ;)

    The challenge lies instead in getting a quiet and well throttling engine,...
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    1,573

    I think it would be a sacrilege to use a wining...

    I think it would be a sacrilege to use a wining electric motor on these old-timers, it just not the same without a real engine in the front....

    The Interceptor Jr looks great. :)
    Plans are...
  21. Replies
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    1,143

    Are you using the same type/blend of fuel as...

    Are you using the same type/blend of fuel as 3-years ago?
    Have you tried to simply set the low end a little richer?
  22. Replies
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    Sticky: None of the conversion heads are any good, it is...

    None of the conversion heads are any good, it is as simple as that.
    (they can be reworked if you have a lathe, but will never perform as well as the heads with integrated glow wire)

    Merlin...
  23. Replies
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    4,179

    No, google translate gives nothing on that, but I...

    No, google translate gives nothing on that, but I can guess what it means... :D

    The makers of the Parra engines have Nelson blanks listed/shown on their site; http://www.clubtamaran.com/Bujias.htm...
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    4,179

    Yes, the ASP .12 are a little "varying" in their...

    Yes, the ASP .12 are a little "varying" in their performance...

    I recently took my best (and oldest) runner apart to try to see what makes it "better". Apart from being well used, with well run...
  25. It is not so much about wing-span as it is about...

    It is not so much about wing-span as it is about wing area and type of plane. CL or RC engine also plays a role, and even a 57" old-school plane can be flown with a .049 engine (unthrottled).
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