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  1. #1

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    Can anyone post OS 25 FX Tach readings please

    Looking for Tach readings on OS 25 FX to compare with my older OS 25 FSR. Would like to see MAS 10x3 and MAS 9x4 RPMs, please list fuel.

    Here's my 25 FSR...
    Omega 10%
    16.3K MAS 10x3
    14.6K MAS 9x4

    Thanks, Bill

  2. #2

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    RE: Can anyone post OS 25 FX Tach readings please

    HmmI'd be interested in tach readings too. I've got an FSR - I found that it runs great on a 10x6. Which is surprising really. I haven't measured the RPMs cos haven't got a tach, but I get more thrust from it than a 10x5 and top speed is almost as fast as a 9x6. I tried a 9x4 APC. Not happy with it at all, the engine revved high but did not seem to like it too much. Not sure what's up with it because a lot of people seem to think that a 10x6 is WAY too big for an FSR. That's the one that works best for me. It can prophang a 3 1/2lb model.

  3. #3

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    RE: Can anyone post OS 25 FX Tach readings please

    Wow a 10x6...I tried a MAS 10x6 once and I think it only got a bit over 10K RPM. I didn't think my engine was up on the power curve at all. You might have a pretty strong engine there. Maybe someone at the field will let you borrow a Tach for a quick reading. Clearly, for sport flying, a 10x3 is a low pitch for this engine...but it's the prop we are using for combat.

    The guys on RCCA have pointed out that the MAS 10x3 is really something less than a "3" pitch. The MAS 10x4 is more like a "3" and compares with an APC 10x3. I will run both this weekend and post results. They are getting low-mid-high 14K on FXs with those props.

    ..Bill

  4. #4

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    RE: Can anyone post OS 25 FX Tach readings please

    Well this Saturday I'll see if I can tach it. Another thing I'd be interested to tach is my little MDS 15. What a screamer. The guy who gave it to me said he had a friend who ran it on 30% nitro. Got it tached at 38,000 RPM on a 6x4. I worked it out and it was giving more power than a MVVS28 with minipipe. Bet it wouldn't last long at those speeds though... I got a 7x4 on mine and run it on 12%. Got a thottled ASP carb on it too so I get the lowest relibable idle at 15,000RPM and WOT at 18,000RPM lol.

  5. #5

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    RE: Can anyone post OS 25 FX Tach readings please

    Oh yeah just out of interest what RPM does a FSR develop the most power at. I must tach it and see if I can't get more power otu of a 10x4 or something...

  6. #6

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    RE: Can anyone post OS 25 FX Tach readings please

    Recently I put two 14-year-old OS 25 FP engines as outboards on a triple. They will both turn 12,200 to 12,700/12,800 with 9 x 6 MAS props. One engine has 3X the run time of the other. Standard muffler outlet has been slightly enlarged and the carb nozzle is adjusted to allow a greater throat area. From memory the adjustment was two turns. If more information is needed I’ll measure.

    Slips. Not sure about the fuel. The club buys it in bulk and it could be 10%. If important I can find out.

  7. #7

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    RE: Can anyone post OS 25 FX Tach readings please

    IN RC Combat the most popular engine is the OS .25FX. It is almost universally propped for combat with a MA 9X4. With supplied muffler the rpms are in the mid 16s. With an aftermarket "mousse can" from Flying Z Hobbies it is not unusual to see low 19s on cool dry days, but low to mid 18s are the norms on 10-15% nitro fuels.
    Waco Brotherhood Member #110

  8. #8

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    RE: Can anyone post OS 25 FX Tach readings please

    9x6 master airscrew 13500 run setting

  9. #9

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    RE: Can anyone post OS 25 FX Tach readings please

    I have a tt 25 pro which is an exact clone of the FSR as a diesel it gives me 10k on an apc 10x6 and 11x4 and 11k on an mas 10x6
    laurence

  10. #10
    Javier-RCU's Avatar
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    RE: Can anyone post OS 25 FX Tach readings please

    OS 25FX with MAC muffler 10% and master 8x7: 16.300 RPM
    When you know the paradise?... When you lost it!

  11. #11
    speedster 1919's Avatar
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    RE: Can anyone post OS 25 FX Tach readings please

    OS 25 FX 3blade 8x6 MAS 5% nitro 20% oil 12,200 rpm
    Hey Buddy -That was the most spectacular crash I\'ve ever seen , That rolling cart wheel with parts slinging out was cool...

  12. #12

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    RE: Can anyone post OS 25 FX Tach readings please

    OS 25 FX with a Master Airscrew S Type 8X6 at 15% getting 16.4K on the ground.

  13. #13
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    RE: Can anyone post OS 25 FX Tach readings please

    We run the .25 FX with APC 8x6 for our quickie 25 pylon series. Average is 16-16.5K. The better ones run a tad over 17.
    A guy who used to live on this site and now is rarely here due to the "upgrade".
    Most likely fading away till the My Forums is fixed. Too bad.


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