Ace Aviation Redrive: New model

Discussion in 'Supplier / Manufacturer Announcements' started by John Penry-Evans, Aug 31, 2019.

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  1. Aug 31, 2019 #1

    John Penry-Evans

    John Penry-Evans

    John Penry-Evans

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    Another Ace Aviation redrive type for the V-Twin commercial engines.
    Predator 670.
    We are a specialist British design and production company for aero sports products based at Ooty, India. (We also manufacture ultralight trikes and wings).
    info@aceaviation.co.uk Preditor 670.jpg
    www.aceaviation.co.uk
     
  2. Sep 1, 2019 #2

    Factory-Fit

    Factory-Fit

    Factory-Fit

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    Hello John
    As you know I'm using one of these redrives to accept the output from a Gaokin liquid cooled EFI V Twin, it's the same engine fitted to the HiSun HS300 ATV, https://www.hisunmotors.com/ sold in the USA, so is in a gentler stage of tune than a motorcycle engine, and doesn't need a gearbox to be cut off as it's variable belt drive already. The power and torque graphs from the manufacturer pushes out 61hp from 800cc (76.25hp/litre). Foolishly, assumed the power claims were, as usual, exaggerated, so assembled with one cone clamping bush in the centre, and found at full throttle the bush was slipping on the taper shaft to parallel adapter (this reduction works with parallel shaft to make it easy to align the pulleys using the adjustable cone clamping bush in the centre). Cure was to insert two cone clamp bushes, they aren't expensive, and this gripped the parallel shaft nicely, the rest of your reduction drive, belt and pulleys, bearings are all coping nicely.
    Now getting full power climbs and definitely at least 55-60 horses or even more, despite keeping the oxygen sensors well out of the exhaust blast for longer life and reliability.
    This is a very strong reduction despite light weight, although the extra cone clamp bush adds 300 grams
    Reckon this engine would pull a fixed wing nicely, it certainly starts and runs well with fuel injection, based on an off the shelf 3-bar injection pump and a VW Polo 2003 fuel filter regulator



    and during the build stages

     
  3. Sep 1, 2019 #3

    David L. Downey

    David L. Downey

    David L. Downey

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    Just wondering what the bare 800 cc engine weighs with all gear but not the Ace redrive?
     
  4. Sep 1, 2019 #4

    103

    103

    103

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    I am still considering grafting the 850cc on in front of my Cygnet SF2A one day.

    The VW is quite reliable and the heads run cool but it is prop limited by the direct drive 3150rpm 2276CC VW to climb more than 600ft/minute at full gross. Getting up out of the weeds faster nets margin. I can land many places I cannot take off with a 58" prop disc.

    At a flying weight of 60-65kg the GK850cc with ACE 2.21:1 Reduction drive combination may also shed a few pounds which always helps flying. I believe the VW with starter dual ignition and dynamo is north of 82kg. 2.5kg could possibly be shed from the tail as well.

     
    Last edited: Sep 1, 2019
  5. Dec 3, 2019 #5

    Armilite

    Armilite

    Armilite

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    =======================================================

    Just curious, what HP is your VW making at 3150rpm?

    3150rpm, Pitched -100rpm for 3050rpm with a 58" Prop = 282.26 lbs of Static Thrust at 77 Degrees with a (2) blade prop.

    58" x 21 = 45.808 hp needed. 282.26 lbs Static Thrust.
    58" x 20 = 43.627 hp needed. 282.26 lbs Static Thrust.
    58" x 19 = 41.445 hp needed. 282.26 lbs Static Thrust.
    58" x 18 = 39.264 hp needed. 282.26 lbs Static Thrust.
    58" x 17 = 37.082 hp needed. 282.26 lbs Static Thrust.
    58" x 16 = 34.901 hp needed. 282.26 lbs Static Thrust.
    58" x 15 = 32.720 hp needed. 282.26 lbs Static Thrust.

    60" x 21 = 52.461 hp needed. 323.25 lbs Static Thrust. +40.99‬ lbs over 58".
    60" x 20 = 49.963 hp needed. 323.25 lbs Static Thrust.
    60" x 19 = 47.464 hp needed. 323.25 lbs Static Thrust.
    60" x 14 = 34.974 hp needed. 323.25 lbs Static Thrust.
    etc.

    62" x 21 = 59.813 hp needed. 368.55 lbs Static Thrust. +86.29‬ lbs over 58".
    62" x 20 = 56.965 hp needed. 368.55 lbs Static Thrust.
    62" x 19 = 54.117 hp needed. 368.55 lbs Static Thrust.
    62" x 12 = 34.179 hp needed. 368.55 lbs Static Thrust.
    etc.

    So is it the Engine HP or Prop used? When you consider the O-200 is rated at 2750rpm, your turning it even higher rpm.

    Static Thrust Calc.
    http://godolloairport.hu/calc/strc_eng/index.htm
     
  6. Dec 3, 2019 #6

    Armilite

    Armilite

    Armilite

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    ==================================================

    This Predator 670 engine produces 43hp at 4700 rpm and has a wide TQ line producing just under 50 ft/lbs of torque from 5000 rpm down to 3500 rpm. What HP is your Belt drive designed for?
    https://www.performance670.com/product-detail/predatorperformance1
     

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