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Ace Aviation Redrive: New model

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Joined
Jan 2, 2012
Messages
24
Location
North Newbald, York, United Kingdom
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.ukView attachment 88299
www.aceaviation.co.uk
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

 

David L. Downey

Active Member
HBA Supporter
Joined
Aug 7, 2019
Messages
40
Just wondering what the bare 800 cc engine weighs with all gear but not the Ace redrive?
 

103

Well-Known Member
Joined
May 2, 2015
Messages
284
Location
Wauwatosa WI
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

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:

Armilite

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Joined
Sep 5, 2011
Messages
3,305
Location
AMES, IA USA
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.

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

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
 

Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,305
Location
AMES, IA USA
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.ukView attachment 88299
www.aceaviation.co.uk
==================================================

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
 

Frank Downunder

New Member
Joined
Sep 2, 2019
Messages
2

John Penry-Evans

Active Member
Joined
Nov 8, 2014
Messages
43
Location
UK / India
Any ideas on how to get a GK engine?
------- > Most people get them through companies that make UTV / ATV`s in Taiwan and China.
GK may not sell to individuals as they are a huge company that mainly supply to the many ATV / ATV manufactures over there.
Advantage is that you will then be able to get their exhausts, electrical equipment, radiator and pipe work etc. and other equipment to complete the aero conversion easier.

These are two contacts from a reliable company that may be able to help you.

guangxiqi@liangzipower.com

95710055@qq.com

You can also email me:
info@aceaviation.co.uk
I can give you details of more companies over there.

We can supply the redrives for these engines.

Hope that this helps you.
 

dino

Well-Known Member
HBA Supporter
Joined
Sep 18, 2007
Messages
680
Location
florida
On their site, the GK 1000 engine is shown as having the transmission as part of the engine block. On the ATVs the CVT is usually seperate. Just trying to get an idea on weight of engine without transmission.
 

John Penry-Evans

Active Member
Joined
Nov 8, 2014
Messages
43
Location
UK / India
On their site, the GK 1000 engine is shown as having the transmission as part of the engine block. On the ATVs the CVT is usually seperate. Just trying to get an idea on weight of engine without transmission.
Weight of an adapted GK 1000cc (83 hp)aero version of this engine should weigh no more than 70 to 76 Kg`s (154 to 167 Lbs).
That is including our Ace Aviation redrive and all other parts like exhaust, pipework, radiator and engine mountings.
The GK 800 and GK 850, 61 and 66 Hp versions weigh around 67 to 70 Kg`s (147 to 154 Lbs) with all the accessories, as above including our redrive.
Weights are without prop.
These engines can be bought without gearbox but with all the above accessories. Not from GK but from the many ATV / UTV manufacturers in China and Taiwan.
 
Last edited:

rv7charlie

Well-Known Member
Joined
Nov 17, 2014
Messages
847
Location
Jackson
Hi John,

Could you edit today's post to clean up the formatting? Looks like some useful info, but it seems to be garbled with, perhaps, ascii errors (weird symbols, etc).

Thanks,

Charlie
 

Blackhawk

Well-Known Member
Joined
Apr 18, 2008
Messages
229
Location
AUSTRALIA
On their site, the GK 1000 engine is shown as having the transmission as part of the engine block. On the ATVs the CVT is usually seperate. Just trying to get an idea on weight of engine without transmission.
I have a 1000cc V-Twin that I bought 2 years ago; engine only weight is 42kg

A very well made motor; it's a copy of the Rotax they use in the CanAm ATV's

V-Twin 003aa.jpg
 
Last edited:

rv7charlie

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Joined
Nov 17, 2014
Messages
847
Location
Jackson
Hi Blackhawk,

Appreciate the pic & weight info. Can you post some more angles? Did you purchase it direct from China, or from a dealer in AUS? Would you mind sharing the price? If you've started your conversion, Please share.

Thanks,

Charlie
 

Blackhawk

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Joined
Apr 18, 2008
Messages
229
Location
AUSTRALIA
It was nearly AU$3200 with shipping, import duty and taxes.

Haven't done anything with a redustion drive as yet.

Specs.

Engine type: V-twin-cylinder, four-stroke, water cooled
Bore x Stroke: 91x75mm
Displacement: 976ml
Compression ratio: 10.3:1
Max power: 62kW/6500/(r/min)
Max torque: 101N·m/5000(r/min)
Min null-load speed: 1650r/min
Min fuel consumption: 265g/kw.h
Gasoline supply type: EFI
Ignition: IDI
Lubrication type: wet slot, oil filter can change
Valve system: SOHC
Starting System; Electric
Weight: 42kg (without gearbox and CVT)

V-Twin - 001.jpg V-Twin - 002.jpg
 

rv7charlie

Well-Known Member
Joined
Nov 17, 2014
Messages
847
Location
Jackson
Not bad. Were you able to purchase it without the gearbox? Did it come with the engine controller, throttle body, injectors, etc? Is this the engine John mentioned earlier? He mentioned 80 HP. This is the 1st one I found in a search, but it says 60 HP.
Thanks,
Charlie
 
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