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In-flight Electric Adjustable IvoProp

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apilot(at)surewest.net
Guest

Posted: Sun May 02, 2010 6:48 pm Post subject: In-flight Electric Adjustable IvoProp

I find that I almost never need to adjust the prop.  After going through much thrust testing.  I found that the difference from 5000 rpm to and through 6300 rpm only gives an additional 40 lbs of thrust.  Since I do not like to run over 5000 because of the fact that 4 cycles (Geo Metro Suzuki G10 engine)  have more service life than when operated in the higher rpm range.  I do believe that the windage tray and the re-ground cam have given me more power. As for popping the breaker, it has only happened once on the ground when I over pitched it.  Also, for reasons that I do not understand, I get more thrust from cutting the 3-blade 72" dia down to 

70" dia.  I fly with a friend in a Maxair Drifter with a 582 Rotax.  We have about the same climb and cruise and he burns around 4 gallons per hour and I burn slightly over 2.5 gallons per hour.  His engine weight is 135 lbs and mine is 145 lbs with electric prop, exhaust and radiator.  

    Vic Kolb Mark III Classic



---- Original message ----

 	  Quote: 	
		  Date: Sun, 2 May 2010 07:47:59 -0700

From: owner-kolb-list-(at)matronics.com (on behalf of Mike Welch <mdnanwelch7(at)hotmail.com>)

Subject: In-flight Electric Adjustable IvoProp  

To: <kolb-list(at)matronics.com>



   Kolb guys,

    

     For those of you that have Ivo Props, and

   especially those of you that have them equiped with

   the electrical adjustment motor, the discussion came

   up about their control on the Aeroelectric list.

     A guy that has the electric operated prop

   mentioned he sure would like to know when the motor

   is drawing it's limit of amps, BEFORE it has to pop

   the circuit breaker.  (If you change the pitch in

   flight, about the only way to find out where the

   pitch is, is to twist the prop all the way flat,

   until the circuit breaker has been maxed out, and

   pops!  Not a very good way to go!

    

     So, after a couple of suggestions, and one

   preliminary design, Bob Nuchols (the Aeroelectric

   guru!!) came up with this design (see attahment). 

     Now, when a person changes pitch in flight, an

   electrical circuit will notify him of the increasing

   current draw, and light an LED at a preset current,

   rather than exceed this limit and pop the breaker.

     Much better way to go!!

    

     Bob included an email with his design that

   identified the intended parameters.  If anyone is

   interested, let me know, and I'll copy it and send

   it to you.

    

   Mike Welch

   MkIII



     ------------------------------------------------



   The New Busy is not the old busy. Search, chat and

   e-mail from your inbox. Get started.

________________

IVO-Prop_Pitch_Controller.pdf (106k bytes)

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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Sun May 02, 2010 8:59 pm Post subject: Re: In-flight Electric Adjustable IvoProp

That sounds pretty good - would you be willing to post your various numbers for your airplane?

Climb out at what speed & rpm -

Cruise at what rpm -

What rpm do you consider normal - too high - and optimum?

Anything else you can think of so that us 582 users who cannot afford a Rotax 912 can have something to relate to - give us as much context as you can.

Also what reduction ratio you are using, who makes your reduction drive system, type of prop, number of blades and anything else pertinent - all in one post. 

(This is your chance to brag on your setup -WEAR IT OUT!)



Thanks,

Richard Pike

MKIII N420P (420ldPoops)

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mdnanwelch7(at)hotmail.co
Guest

Posted: Mon May 03, 2010 4:38 am Post subject: In-flight Electric Adjustable IvoProp

Mrs. Michelle Cole (I really know you're Vic G.  he he),

  

   Thanks for the feedback regarding your IvoProp.  I am glad to hear you don't fiddle with it much.  That's one of the things I did NOT want to do (adjust it much).  I'd be happy if I could just set it...and forget it.

   I think I'll still build the circuit, tho.  With my very limited experience with adj. props, I think knowing roughly where the pitch is will be better than nothing (at least for me).

   My Ivo is already cut down to a 70" diameter.  I bought it that way.

  

   I second what Bro Pike said.  How about a full run-down on your engine....performance, numbers, noise levels, as much as you can fill in the blanks.

  

   Regarding GEO engines, and their performance;  it shouldn't be too much longer before I can fire mine up again.  I had it 100% complete and running at one time, prior to installing the turbo, but then decided to add my own turbocharger and hi-po cam.

   Adding a turbo should put the power around a Rotax 912, maybe more...maybe less.  I won't know exactly, until I can measure thrust and other stuff.   We'll see.......

   BTW, my installation includes a host of gauges that monitor all the critical things to watch for, i.e. boost gauge, EGT, AFR, Manifold Pressure, etc.  To install my turbo package (turbo, gauges, new muffler, cam, etc.), I have spent a total of around $1500.  Add this to my engine and prop costs of $6500 and I have a grand total cost of $8000 for everything.



 Mike Welch

 MkIII

  

  

[quote] From: apilot(at)surewest.net

 Subject: Re: Kolb-List: In-flight Electric Adjustable IvoProp

 To: kolb-list(at)matronics.com

 Date: Sun, 2 May 2010 19:42:54 -0700

 

 --> Kolb-List message posted by: "Mrs. Michelle Cole" <apilot(at)surewest.net>

 

 I find that I almost never need to adjust the prop. After going through much thrust testing. I found that the difference from 5000 rpm to and through 6300 rpm only gives an additional 40 lbs of thrust. Since I do not like to run over 5000 because of the fact that 4 cycles (Geo Metro Suzuki G10 engine) have more service life than when operated in the higher rpm range. I do believe that the windage tray and the re-ground cam have given me more power. As for popping the breaker, it has only happened once on the ground when I over pitched it. Also, for reasons that I do not understand, I get more thrust from cutting the 3-blade 72" dia down to 

 70" dia. I fly with a friend in a Maxair Drifter with a 582 Rotax. We have about the same climb and cruise and he burns around 4 gallons per hour and I burn slightly over 2.5 gallons per hour. His engine weight is 135 lbs and mine is 145 lbs with electric prop, exhaust and radiator. 

 Vic Kolb Mark III Classic

 

 ---- Original message ----

 >Date: Sun, 2 May 2010 07:47:59 -0700

 >From: owner-kolb-list-(at)matronics.com (on behalf of Mike Welch <mdnanwelch7(at)hotmail.com>)

 >Subject: Kolb-List: In-flight Electric Adjustable IvoProp 

 >To: <kolb-list(at)matronics.com>

 >

 > Kolb guys,

 > 

 > For those of you that have Ivo Props, and

 > especially those of you that have them equiped with

 > the electrical adjustment motor, the discussion came

 > up about their control on the Aeroelectric list.

 > A guy that has the electric operated prop

 > mentioned he sure would like to know when the motor

 > is drawing it's limit of amps, BEFORE it has to pop

 > the circuit breaker. (If you change the pitch in

 > flight, about the only way to find out where the

 > pitch is, is to twist the prop all the way flat,

 > until the circuit breaker has been maxed out, and

 > pops! Not a very good way to go!

 > 

 > So, after a couple of suggestions, and one

 > preliminary design, Bob Nuchols (the Aeroelectric

 > guru!!) came up with this design (see attahment). 

 > Now, when a person changes pitch in flight, an

 > electrical circuit will notify him of the increasing

 > current draw, and light an LED at a preset current,

 > rather than exceed this limit and pop the breaker.

 > Much better way to go!!

 > 

 > Bob included an email with his design that

 > identified the intended parameters. If anyone is

 > interested, let me know, and I'll copy it and send

 > it to you.

 > 

 > Mike Welch

 > MkIII

 >

 > ------------------------------------------------

 >

 > The New Busy is not the old busy. Search, chat and

 > e-mail from your inbox. Get started.

 >________________

 >IVO-Prop_Pitch_Co=====================

 

 

 

 		 	   		  Hotmail is redefining busy with tools for the New Busy. Get more from your inbox. See how.   	  Quote: 	
		  [b]

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apilot(at)surewest.net
Guest

Posted: Mon May 03, 2010 2:08 pm Post subject: In-flight Electric Adjustable IvoProp

About all that I can add is that Jeron Smith at Raven

Re-drive was very helpful and his information was right on.  The only thing different on mine from what Raven recommends is that my exhaust design is very light, very simple and very inexpensive.  



---- Original message ----

 	  Quote: 	
		  Date: Sun,  2 May 2010 21:59:13 -0700

From: owner-kolb-list-server(at)matronics.com (on behalf of "Richard Pike" <richard(at)bcchapel.org>)

Subject: Re: In-flight Electric Adjustable IvoProp  

To: kolb-list(at)matronics.com






That sounds pretty good - would you be willing to post your various numbers for your airplane?

Climb out at what speed & rpm -

Cruise at what rpm -

What rpm do you consider normal - too high - and optimum?

Anything else you can think of so that us 582 users who cannot afford a Rotax 912 can have something to relate to - give us as much context as you can.

Also what reduction ratio you are using, who makes your reduction drive system, type of prop, number of blades and anything else pertinent - all in one post. 

(This is your chance to brag on your setup -WEAR IT OUT!)



Thanks,

Richard Pike

MKIII N420P (420ldPoops)





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