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alderman.kevin0610(at)gma
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 Posted: Wed May 01, 2013 2:32 am Post subject: KIS-List Digest: 5 Msgs - 04/30/13 |
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The gearbox is made by Tracy Crook at rotary aviation. There are many of these flying around the world- really. The longest running one that I have personally seen is Tracys RV4 with 2200 hours, and his RV6 3 rotor with over 1000. There are also 2 lancairs in Texas, an RV4 with a turbo mazda that raced last year at Reno etc.
The gearbox is really simple- a central drive shaft made from a truck axle turned by a planetary set from a Ford E4OD truck transmission. If you count the 6 planets in the gear set, we are up to 10 moving parts including the turbo for the whole thing. A Lycoming IO360 has 1548  .
The pros include a new engine for less than 4K, few moving parts, no valves and high power
The cons include you have to build it yourself or find someone that has done it.
My old IO520D needed 2 cylinders. These cylinders cost more than a new rotary. I developed a bad skip in flight with the 520D, and when I landed I did a compression check and changed the oil. 0 compression on number 1, 30 lbs on 2. I owned a construction company for 22 years and as such know the value of equipment, so as we normally would I set out to rebuild the 520. This is where the issue came in- 2 ADs. The first said that I had the light crankcase and if I took it apart I had to send it off. Continental told me that less than 40% would come out as OK. AD number 2 said that I had a non VAR crank, and couldnt re-use it. If I opened the crankcase, the crank had to go.
So, to rebuild the engine I needed a new crank at over 8K, all new cylinders, possibly a new crankcase, etc. OR- (now is the time to sit down) if the engine had acceptable oil pressure I could stick 2 cylinders on it and fly and be FAA legal. In spite of a handful of metal in the oil removed from the engine, I had oil pressure in the green when it was tested. Who knows how much bearing damage was done by the metal. But I couldn't open it up and even check the bearings.
Unacceptable. And with the 2 ADs, Continental gave me a whole $3,000 credit toward a new $54,000 engine. Again unacceptable.
There are many of these engines in airplanes- half of the Air Forces UAVs are powered by jet fuel burning rotary engines- as well as lots of boats, equipment, Lancairs, Cozys, RVs, etc. I have an engine in my plane, and a spare pickled in the garage. So while the "airplane" engine guys spend $2,000 on a cylinder, If I have a problem I just swap the whole engine and fly with a brand new one.
I am also finished with the system but it works out like this- Mazda 13B rotary, Rotary aviation gearbox at 2.85:1. EFI with mechanical backup.
The throttle will be computer controlled similar to cruise control in your car. There will be 4 normal positions- takeoff- cruise- flight idle- ground idle.
For takeoff push it to the T/O position, and the computer will control boost, power, temps, etc. and keep it at 7500 RPM. After climb pull it to flight cruise and the computer will keep it at 6000 RPM whether you are in a climb or descent. When you want to go down, flight idle will reduce the RPM to 4500, which will also be the taxi setting. Then ground idle for waiting to go.
There will always be manual control, but shouldn't be needed with redundant EFI computers and 8 hours of battery backup.
I could go on for days, but you should have a good picture of what is in my head by now.
Kevin Alderman
Maybe I should add Obsessive Compulsive to what goes under my name!
On Wed, May 1, 2013 at 3:00 AM, KIS-List Digest Server <kis-list(at)matronics.com (kis-list(at)matronics.com)> wrote:
[quote] *
=========================
Online Versions of Today's List Digest Archive
=========================
Today's complete KIS-List Digest can also be found in either of the
two Web Links listed below. The .html file includes the Digest formatted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation. The .txt file includes the plain ASCII version
of the KIS-List Digest and can be viewed with a generic text editor
such as Notepad or with a web browser.
HTML Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter=2013-04-30&Archive=KIS
Text Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter=2013-04-30&Archive=KIS
================================================
EMail Version of Today's List Digest Archive
================================================
----------------------------------------------------------
KIS-List Digest Archive
---
Total Messages Posted Tue 04/30/13: 5
----------------------------------------------------------
Today's Message Index:
----------------------
1. 03:27 AM - Re: KIS-List Digest: 2 Msgs - 04/29/13 (Kevin Alderman)
2. 06:08 AM - Catto Propeller (Galin Hernandez)
3. 06:10 AM - Re: Re: KIS-List Digest: 2 Msgs - 04/29/13 (Graham Brighton)
4. 06:46 AM - Re: Catto Propeller (William Schertz)
5. 05:11 PM - Re: Catto Propeller (Galin Hernandez)
________________________________ Message 1 _____________________________________
Time: 03:27:12 AM PST US
Subject: Re: KIS-List Digest: 2 Msgs - 04/29/13
From: Kevin Alderman <alderman.kevin0610(at)gmail.com (alderman.kevin0610(at)gmail.com)>
A turbine is a good engine, but not for our general use. The biggest factor
is fuel burn There is a small helicopter that uses a 100 hp SOLAS turbine
for power. It is small, light and responsive. It burns 9 GPH at idle on the
ground, and making 100 HP it burns closer to 14 GPH. Turbines are great for
high altitude high speed flight, for flight in our normal flight regime it
will work but the fuel costs are multitudes higher.
Also, turbines such as the SOLAS operate at high speeds around 50,000 RPM,
and as such need a gearbox to reduce the engine speed to prop speed. The
Helicopter supplier makes their own, you would have to find one somewhere.
Turbines have a very very narrow power and engine speed range. The power is
varied by a CS prop. Your gearbox will have to be able to support a CS prop
and include a governor. The engine itself will (or should) have a
controller that controls/ limits engine RPM, but you will still need a
method of controlling the prop pitch.
In a turboprop like a Pilatus, it goes like this: The engine is started at
ground idle, which is a turbine speed of around 80% of flight speed, i.e.
40K RPM. After warm up and taxi, the engine is brought up to flight cruise
power and the prop is cycled somewhat similar to our run-up with a piston
recip. For takeoff, the throttle is pushed to takeoff and the prop full
forward for maximum THRUST. At altitude, the throttle is pulled back to
flight cruise, the prop placed in cruise and off we go.
Turbine engines are only cost efficient at high altitudes and high speeds.
Most jet operators will tell you that if they had to fly below 30K feet all
the time they couldn't afford the fuel.
Another added benefit of a turbine is pressurization- they take compressed
high pressure air from the cold- compressor- section and send it into the
cabin. The air is hot from compression, and doubles as cabin heat. If you
aren't going to fly at the flight levels, this is another waste of power.
I am building a Wheeler Express- after flights to Central America, the
Bahamas, and other places that do not have Avgas, I thought about a 300HP
turbine. My plane with a 300 HP gas engine will burn around 12 gph at 180
kts at 14,500 ft. My 100 gal fuel capacity will give me more than a 1000
mile range. The 300 HP turbine fuel burn is closer to 28 GPH in flight even
at FL 180. Cuts my range in half, even though I gain 30 kts in speed.
Kevin Alderman
Avionics Tech/ Aircraft restoration
Building a Wheeler Express with a Mazda Rotary 13B turbo- 300 HP- 3 moving
parts.
On Tue, Apr 30, 2013 at 3:00 AM, KIS-List Digest Server <
kis-list(at)matronics.com (kis-list(at)matronics.com)> wrote:
> *
>
> ========================
> Online Versions of Today's List Digest Archive
> ========================
>
> Today's complete KIS-List Digest can also be found in either of the
> two Web Links listed below. The .html file includes the Digest formatted
> in HTML for viewing with a web browser and features Hyperlinked Indexes
> and Message Navigation. The .txt file includes the plain ASCII version
> of the KIS-List Digest and can be viewed with a generic text editor
> such as Notepad or with a web browser.
>
> HTML Version:
>
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 13-04-29&Archive=KIS
>
> Text Version:
>
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 13-04-29&Archive=KIS
>
>
> ======================
> EMail Version of Today's List Digest Archive
> ======================
>
>
> ----------------------------------------------------------
> KIS-List Digest Archive
> ---
> Total Messages Posted Mon 04/29/13: 2
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 04:59 AM - Re: Turbine (ALFRED ROSA)
> 2. 06:45 AM - Re: Turbine (Galin Hernandez)
>
>
> ________________________________ Message 1
> _____________________________________
>
>
> Time: 04:59:55 AM PST US
> Subject: Re: Turbine
> From: ALFRED ROSA <fredorosa(at)gmail.com (fredorosa(at)gmail.com)>
>
> Just wondering what advantage you are hoping to achieve with a turbine?
> Also, If you need a Cruiser without engine and avionics, I have one in my
> garage.
>
> Al
>
> On Mon, Apr 29, 2013 at 12:55 AM, John Petrie <jpetrie(at)sonicfactory.co.za (jpetrie(at)sonicfactory.co.za)
> >wrote:
>
> >
> > Hi all,
> >
> > It's been a while since I last posted on this group, largely due to the
> > fact that I sold my KIS Cruiser.
> > I am now looking for a new project and am considering buying my Cruiser
> > back and fitting a turbine engine. I know absolutely nothing about
> > turbines, and hence the reason for this post. If anyone can point me in
> > the right direction or provide some other useful information, I'm all
> ears.
> > Thanks a mil.
> >
> > John Petrie
> > Sonic Factory
> > 082 574 6190
> > Sent from my mobile
> >
> >
>
> ________________________________ Message 2
> _____________________________________
>
>
> Time: 06:45:52 AM PST US
> From: Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)>
> Subject: Re: Turbine
>
> Now THAT sounds like a cool project. I think 100LL will eventually go away
> and a Jet-A type alternative is a good idea. Besides, it sounds like fun to
> do.
>
>
> On Sun, Apr 28, 2013 at 11:55 PM, John Petrie <jpetrie(at)sonicfactory.co.za (jpetrie(at)sonicfactory.co.za)
> >wrote:
>
> >
> > Hi all,
> >
> > It's been a while since I last posted on this group, largely due to the
> > fact that I sold my KIS Cruiser.
> > I am now looking for a new project and am considering buying my Cruiser
> > back and fitting a turbine engine. I know absolutely nothing about
> > turbines, and hence the reason for this post. If anyone can point me in
> > the right direction or provide some other useful information, I'm all
> ears.
> > Thanks a mil.
> >
> > John Petrie
> > Sonic Factory
> > 082 574 6190
> > Sent from my mobile
> >
> >
>
>
________________________________ Message 2 _____________________________________
Time: 06:08:01 AM PST US
From: Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)>
Subject: Catto Propeller
Is anyone flying with a Catto propeller? I know Bob Reed has one but is not
flying yet.
________________________________ Message 3 _____________________________________
Time: 06:10:21 AM PST US
From: "Graham Brighton" <gbrighton(at)skymesh.com.au (gbrighton(at)skymesh.com.au)>
Subject: Re: Re: KIS-List Digest: 2 Msgs - 04/29/13
Great Reply Kevin ,
But few more moving parts than 3 hey
.!! ... with the Turbo ... and gearbox too .. and what gearbox are u
intending use/try .... ? not much available with proven hours and or
tested TV analysis ..!!??
Graham
.
From: Kevin Alderman
Sent: Tuesday, April 30, 2013 8:26 PM
Subject: Re: KIS-List Digest: 2 Msgs - 04/29/13
A turbine is a good engine, but not for our general use. The biggest
factor is fuel burn There is a small helicopter that uses a 100 hp SOLAS
turbine for power. It is small, light and responsive. It burns 9 GPH at
idle on the ground, and making 100 HP it burns closer to 14 GPH.
Turbines are great for high altitude high speed flight, for flight in
our normal flight regime it will work but the fuel costs are multitudes
higher.
Also, turbines such as the SOLAS operate at high speeds around 50,000
RPM, and as such need a gearbox to reduce the engine speed to prop
speed. The Helicopter supplier makes their own, you would have to find
one somewhere.
Turbines have a very very narrow power and engine speed range. The power
is varied by a CS prop. Your gearbox will have to be able to support a
CS prop and include a governor. The engine itself will (or should) have
a controller that controls/ limits engine RPM, but you will still need a
method of controlling the prop pitch.
In a turboprop like a Pilatus, it goes like this: The engine is started
at ground idle, which is a turbine speed of around 80% of flight speed,
i.e. 40K RPM. After warm up and taxi, the engine is brought up to flight
cruise power and the prop is cycled somewhat similar to our run-up with
a piston recip. For takeoff, the throttle is pushed to takeoff and the
prop full forward for maximum THRUST. At altitude, the throttle is
pulled back to flight cruise, the prop placed in cruise and off we go.
Turbine engines are only cost efficient at high altitudes and high
speeds. Most jet operators will tell you that if they had to fly below
30K feet all the time they couldn't afford the fuel.
Another added benefit of a turbine is pressurization- they take
compressed high pressure air from the cold- compressor- section and send
it into the cabin. The air is hot from compression, and doubles as cabin
heat. If you aren't going to fly at the flight levels, this is another
waste of power.
I am building a Wheeler Express- after flights to Central America, the
Bahamas, and other places that do not have Avgas, I thought about a
300HP turbine. My plane with a 300 HP gas engine will burn around 12 gph
at 180 kts at 14,500 ft. My 100 gal fuel capacity will give me more than
a 1000 mile range. The 300 HP turbine fuel burn is closer to 28 GPH in
flight even at FL 180. Cuts my range in half, even though I gain 30 kts
in speed.
Kevin Alderman
Avionics Tech/ Aircraft restoration
Building a Wheeler Express with a Mazda Rotary 13B turbo- 300 HP- 3
moving parts.
On Tue, Apr 30, 2013 at 3:00 AM, KIS-List Digest Server
<kis-list(at)matronics.com (kis-list(at)matronics.com)> wrote:
*
Online Versions of Today's List Digest Archive
Today's complete KIS-List Digest can also be found in either of the
two Web Links listed below. The .html file includes the Digest
formatted
in HTML for viewing with a web browser and features Hyperlinked
Indexes
and Message Navigation. The .txt file includes the plain ASCII
version
of the KIS-List Digest and can be viewed with a generic text editor
such as Notepad or with a web browser.
HTML Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=html&
Chapter 13-04-29&Archive=KIS
Text Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&C
hapter 13-04-29&Archive=KIS
======================
EMail Version of Today's List Digest Archive
======================
----------------------------------------------------------
KIS-List Digest Archive
---
Total Messages Posted Mon 04/29/13: 2
----------------------------------------------------------
Today's Message Index:
----------------------
1. 04:59 AM - Re: Turbine (ALFRED ROSA)
2. 06:45 AM - Re: Turbine (Galin Hernandez)
________________________________ Message 1
_____________________________________
Time: 04:59:55 AM PST US
Subject: Re: Turbine
From: ALFRED ROSA <fredorosa(at)gmail.com (fredorosa(at)gmail.com)>
Just wondering what advantage you are hoping to achieve with a
turbine?
Also, If you need a Cruiser without engine and avionics, I have one
in my
garage.
Al
On Mon, Apr 29, 2013 at 12:55 AM, John Petrie
<jpetrie(at)sonicfactory.co.za (jpetrie(at)sonicfactory.co.za)>wrote:
>
> Hi all,
>
> It's been a while since I last posted on this group, largely due to
the
> fact that I sold my KIS Cruiser.
> I am now looking for a new project and am considering buying my
Cruiser
> back and fitting a turbine engine. I know absolutely nothing about
> turbines, and hence the reason for this post. If anyone can point
me in
> the right direction or provide some other useful information, I'm
all ears.
> Thanks a mil.
>
> John Petrie
> Sonic Factory
> 082 574 6190
> Sent from my mobile
>
>
________________________________ Message 2
_____________________________________
Time: 06:45:52 AM PST US
From: Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)>
Subject: Re: Turbine
Now THAT sounds like a cool project. I think 100LL will eventually go
away
and a Jet-A type alternative is a good idea. Besides, it sounds like
fun to
do.
On Sun, Apr 28, 2013 at 11:55 PM, John Petrie
<jpetrie(at)sonicfactory.co.za (jpetrie(at)sonicfactory.co.za)>wrote:
>
> Hi all,
>
> It's been a while since I last posted on this group, largely due to
the
> fact that I sold my KIS Cruiser.
> I am now looking for a new project and am considering buying my
Cruiser
> back and fitting a turbine engine. I know absolutely nothing about
> turbines, and hence the reason for this post. If anyone can point
me in
> the right direction or provide some other useful information, I'm
all ears.
> Thanks a mil.
>
> John Petrie
> Sonic Factory
> 082 574 6190
> Sent from my mobile
>
>
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http://forums.matronics.com
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________________________________ Message 4 _____________________________________
Time: 06:46:24 AM PST US
From: "William Schertz" <wschertz(at)comcast.net (wschertz(at)comcast.net)>
Subject: Re: Catto Propeller
I am flying with a 76x76 Catto 2 blade prop on my Rotary powered KIS
Bill Schertz
From: Galin Hernandez
Sent: Tuesday, April 30, 2013 8:07 AM
Subject: Catto Propeller
Is anyone flying with a Catto propeller? I know Bob Reed has one but is
not flying yet.
________________________________ Message 5 _____________________________________
Time: 05:11:36 PM PST US
From: Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)>
Subject: Re: Catto Propeller
Bill, How do you like the propeller?
On Tue, Apr 30, 2013 at 8:46 AM, William Schertz <wschertz(at)comcast.net (wschertz(at)comcast.net)>wrote:
> I am flying with a 76x76 Catto 2 blade prop on my Rotary powered KIS
>
> Bill Schertz
>
>
> *From:* Galin Hernandez <galinhdz(at)gmail.com (galinhdz(at)gmail.com)>
> *Sent:* Tuesday, April 30, 2013 8:07 AM
> *To:* kis-list(at)matronics.com (kis-list(at)matronics.com)
> *Subject:* Catto Propeller
>
> Is anyone flying with a Catto propeller? I know Bob Reed has one but is
> not flying yet.
>
> *
>
> href="http://www.matronics.com/Navigator?KIS-List">http://www.matronics.com/Navigator?KIS-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">[url=http://www.matronics.com/c*]http://www.matronics.com/c*[/url]
>
> *
>
> *
>
>
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rget="_blank">http://www.matronics.com/Navigator?KIS-List
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gbrighton(at)skymesh.com.
Guest
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| Posted: Thu May 02, 2013 4:55 am Post subject: KIS-List Digest: 5 Msgs - 04/30/13 |
|
|
Hi back Kevin ,
Thanks again for your great reply again .... and clear that u have great hopes and expectations which i really hope come to fruition .... Tracey is the champion of the Rotary club ... buts there must be a reason he doesn't have many challengers ... history sees that most redrives get mods and reworks and lots are no more ..would be surprised if Tracey has so may hours on a single version .. Certainly true 'Aero' engines are crazy expensive .... but most auto conversions dollars will total up with reworks and mods etc too ... !??
Planetary redrives also have a spotty record too .... the Rotary is also know for high fuel burn and high exhaust temps and noise that is difficult to manage ... not trying to be a wet blanket .. just wanting to fill out the picture a bit more ... ,
I'm a auto conversion guy so ... we are on the same page though ... if Lycoming ever came out with water cooled heads i could jump ship though ..!!
Wishing u nothing but success ..and plz keep us posted with ur progress
Cheers
Graham
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jpetrie(at)sonicfactory.c
Guest
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| Posted: Thu May 02, 2013 7:30 pm Post subject: KIS-List Digest: 5 Msgs - 04/30/13 |
|
|
Thanks for all the replies everyone.
Certainly a lot of food for thought. One thing is for sure though after my
Subaru experience, I definitely won't be going the automotive conversion
route again.
Chat soon,
John
From: Kevin Alderman <alderman.kevin0610(at)gmail.com>
Reply-To: <kis-list(at)matronics.com>
Date: Wednesday 01 May 2013 12:32 PM
To: <kis-list(at)matronics.com>
Subject: Re: KIS-List Digest: 5 Msgs - 04/30/13
The gearbox is made by Tracy Crook at rotary aviation. There are many of
these flying around the world- really. The longest running one that I have
personally seen is Tracys RV4 with 2200 hours, and his RV6 3 rotor with over
1000. There are also 2 lancairs in Texas, an RV4 with a turbo mazda that
raced last year at Reno etc.
The gearbox is really simple- a central drive shaft made from a truck axle
turned by a planetary set from a Ford E4OD truck transmission. If you count
the 6 planets in the gear set, we are up to 10 moving parts including the
turbo for the whole thing. A Lycoming IO360 has 1548 .
The pros include a new engine for less than 4K, few moving parts, no valves
and high power
The cons include you have to build it yourself or find someone that has done
it.
My old IO520D needed 2 cylinders. These cylinders cost more than a new
rotary. I developed a bad skip in flight with the 520D, and when I landed I
did a compression check and changed the oil. 0 compression on number 1, 30
lbs on 2. I owned a construction company for 22 years and as such know the
value of equipment, so as we normally would I set out to rebuild the 520.
This is where the issue came in- 2 ADs. The first said that I had the light
crankcase and if I took it apart I had to send it off. Continental told me
that less than 40% would come out as OK. AD number 2 said that I had a non
VAR crank, and couldnt re-use it. If I opened the crankcase, the crank had
to go.
So, to rebuild the engine I needed a new crank at over 8K, all new
cylinders, possibly a new crankcase, etc. OR- (now is the time to sit down)
if the engine had acceptable oil pressure I could stick 2 cylinders on it
and fly and be FAA legal. In spite of a handful of metal in the oil removed
from the engine, I had oil pressure in the green when it was tested. Who
knows how much bearing damage was done by the metal. But I couldn't open it
up and even check the bearings.
Unacceptable. And with the 2 ADs, Continental gave me a whole $3,000 credit
toward a new $54,000 engine. Again unacceptable.
There are many of these engines in airplanes- half of the Air Forces UAVs
are powered by jet fuel burning rotary engines- as well as lots of boats,
equipment, Lancairs, Cozys, RVs, etc. I have an engine in my plane, and a
spare pickled in the garage. So while the "airplane" engine guys spend
$2,000 on a cylinder, If I have a problem I just swap the whole engine and
fly with a brand new one.
I am also finished with the system but it works out like this- Mazda 13B
rotary, Rotary aviation gearbox at 2.85:1. EFI with mechanical backup.
The throttle will be computer controlled similar to cruise control in your
car. There will be 4 normal positions- takeoff- cruise- flight idle- ground
idle.
For takeoff push it to the T/O position, and the computer will control
boost, power, temps, etc. and keep it at 7500 RPM. After climb pull it to
flight cruise and the computer will keep it at 6000 RPM whether you are in a
climb or descent. When you want to go down, flight idle will reduce the RPM
to 4500, which will also be the taxi setting. Then ground idle for waiting
to go.
There will always be manual control, but shouldn't be needed with redundant
EFI computers and 8 hours of battery backup.
I could go on for days, but you should have a good picture of what is in my
head by now.
Kevin Alderman
Maybe I should add Obsessive Compulsive to what goes under my name!
On Wed, May 1, 2013 at 3:00 AM, KIS-List Digest Server
<kis-list(at)matronics.com> wrote:
[quote] *
=========================
Online Versions of Today's List Digest Archive
=========================
Today's complete KIS-List Digest can also be found in either of the
two Web Links listed below. The .html file includes the Digest formatted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation. The .txt file includes the plain ASCII version
of the KIS-List Digest and can be viewed with a generic text editor
such as Notepad or with a web browser.
HTML Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter=2
013-04-30&Archive=KIS
Text Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter=20
13-04-30&Archive=KIS
================================================
EMail Version of Today's List Digest Archive
================================================
----------------------------------------------------------
KIS-List Digest Archive
---
Total Messages Posted Tue 04/30/13: 5
----------------------------------------------------------
Today's Message Index:
----------------------
1. 03:27 AM - Re: KIS-List Digest: 2 Msgs - 04/29/13 (Kevin Alderman)
2. 06:08 AM - Catto Propeller (Galin Hernandez)
3. 06:10 AM - Re: Re: KIS-List Digest: 2 Msgs - 04/29/13 (Graham
Brighton)
4. 06:46 AM - Re: Catto Propeller (William Schertz)
5. 05:11 PM - Re: Catto Propeller (Galin Hernandez)
________________________________ Message 1
_____________________________________
Time: 03:27:12 AM PST US
Subject: Re: KIS-List Digest: 2 Msgs - 04/29/13
From: Kevin Alderman <alderman.kevin0610(at)gmail.com>
A turbine is a good engine, but not for our general use. The biggest factor
is fuel burn There is a small helicopter that uses a 100 hp SOLAS turbine
for power. It is small, light and responsive. It burns 9 GPH at idle on the
ground, and making 100 HP it burns closer to 14 GPH. Turbines are great for
high altitude high speed flight, for flight in our normal flight regime it
will work but the fuel costs are multitudes higher.
Also, turbines such as the SOLAS operate at high speeds around 50,000 RPM,
and as such need a gearbox to reduce the engine speed to prop speed. The
Helicopter supplier makes their own, you would have to find one somewhere
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