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A not-so-busy fternoon

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zsmith3rd(at)earthlink.ne
Guest

Posted: Thu Oct 01, 2009 1:43 pm Post subject: A not-so-busy fternoon

do NOT archive



Actually, guys, over the last few months there has been considerable chit-chat about ever-more-powerful engines for the 701.



When Chris Heintz designed the 701 he put a two-stroke 60HP up front.  There was mention some years ago of one flying with 40 horses up front.  Obviously neither of these engines pose any danger to existing speed records.



The 80HP Rotax 912 does a great job.  Then Rotax kicked that up to 100HP. Somebody put in on the 701.

Then Rotax did 115HP.  Another 701 install.



The need for speed totally bypasses the 701, regardless of the 'experimenter spirit'.....seems that there is an old story involving a 'silk purse and a sow's ear'.....



The RV line of aircraft, and others of like design, offer 'speed' and the opportunity to feed a big engine.



My "R985" comment was in jest.....heck, let us take a quantum leap...move right up to an R2800.

Prop clearance, weight & balance, tire pressure, etc, can probably be worked around; I'm just not sure how to carry enough fuel to taxi out to the runway.



It's still lots of fun!



Happy Rivet Stems to all,



Zed

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Thu Oct 01, 2009 5:29 pm Post subject: Re: A not-so-busy fternoon

Zed,



I agree.  I think the 912ULS is too much engine for the 701.  I guess you can't really have too much power, but with the 100hp Rotax, it seems that way.  



It seems to me the 912ULS just hurls the 701 into the air.



I think, and if I were going to fly a 701 forever, I would try to put a 912UL in it.  Both for fuel economy (regular gas) and smoother engine.  



But the 912ULS will certainly get you in the sky in a hurry.



Tommy Walker in Alabama

N8701T  Getting ready to put the wings on.

Do Not Archive anything I write

"When Chris Heintz designed the 701 he put a two-stroke 60HP up front. There was mention some years ago of one flying with 40 horses up front. Obviously neither of these engines pose any danger to existing speed records. 



The 80HP Rotax 912 does a great job. Then Rotax kicked that up to 100HP. Somebody put in on the 701."

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_________________
Tommy Walker
N25A - Anniston, AL

ch701builder(at)yahoo.com
Guest

Posted: Fri Oct 02, 2009 6:29 am Post subject: A not-so-busy fternoon

Hey Tommy,

I think that 80hp is OK, but since most of my flying will be at 10,500' and above, an 80 horse engine will perform like a 50hp engine, which really stinks.



I have had a hard time finding anybody who will post some performance numbers for high altitude flying. There is a guy up in the Denver area that has a 701 with a 914, that I would like to go see this Winter.



Personal note: I should be down your way again around the last week of Oct and first week of Nov. I might stop by again if you wouldn't mind!!!



Keith

(still trying to buck rivet the cabin sides)

************************************************

From: Tommy Walker <twalker(at)cableone.net>

To: zenith701801-list(at)matronics.com

Sent: Thursday, October 1, 2009 7:29:58 PM

Subject: Re: A not-so-busy fternoon



 --> Zenith701801-List message posted by: "Tommy Walker" <twalker(at)cableone.net (twalker(at)cableone.net)>



Zed,



I agree.  I think the 912ULS is too much engine for the 701.  I guess you can't really have too much power, but with the 100hp Rotax, it seems that way.  



It seems to me the 912ULS just hurls the 701 into the air.



I think, and if I were going to fly a 701 forever, I would try to put a 912UL in it.  Both for fuel economy (regular gas) and smoother engine.  



But the 912ULS will certainly get you in the sky in a hurry.



Tommy Walker in Alabama

N8701T  Getting ready to put the wings on.

Do Not Archive anything I write

"When Chris Heintz designed the 701 he put a two-stroke 60HP up front. There was mention some years ago of one flying with 40 horses up front. Obviously neither of these engines pose any           [quote][b]

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JohnDRead(at)aol.com
Guest

Posted: Fri Oct 02, 2009 9:32 pm Post subject: A not-so-busy fternoon

Hi Keith;

             There  are a couple of us that are planning to fly 701's at high altitude in  Colorado. I am at 7200 feet and the other guys is at around 8500 feet elevation.  We are each using Jabiru 3300 engines. The 3300 is rated at 120 peak HP at sea  level, 100 continuous at our elevations we will be lucky to see about 80%  of the sea level power, further our props will not have the bite they would at  sea level. We are still limited to the max RPM at take off so we cannot up the  revs to compensate.

  

 John  Read

CH701 - Elbert CO - Jabiru 3300



Phone: 303-648-3261

Fax:  303-648-3262

Cell: 719-494-4567   

  In a message dated 10/2/2009 8:30:12 A.M. Mountain Daylight Time,  ch701builder(at)yahoo.com writes:

  	  Quote: 	
		        Hey Tommy,

I think that 80hp is OK, but since most of my flying will    be at 10,500' and above, an 80 horse engine will perform like a 50hp engine,    which really stinks.



I have had a hard time finding anybody who will    post some performance numbers for high altitude flying. There is a guy up in    the Denver area that has a 701 with a 914, that I would like to go see this    Winter.



Personal note: I should be down your way again around the last    week of Oct and first week of Nov. I might stop by again if you wouldn't    mind!!!



Keith

(still trying to buck rivet the cabin    sides)

************************************************



   

         From: Tommy Walker    <twalker(at)cableone.net>

To:    zenith701801-list(at)matronics.com

Sent: Thursday, October 1, 2009 7:29:58    PM

Subject:    Re: A not-so-busy fternoon



-->    Zenith701801-List message posted by: "Tommy Walker" <twalker(at)cableone.net (twalker(at)cableone.net)>



Zed,



I    agree.  I think the 912ULS is too much engine for the 701.  I guess    you can't really have too much power, but with the 100hp Rotax, it seems that    way.  



It seems to me the 912ULS just hurls the 701 into the    air.



I think, and if I were going to fly a 701 forever, I would try to    put a 912UL in it.  Both for fuel economy (regular gas) and smoother    engine.  



But the 912ULS will certainly get you in the sky in a    hurry.



Tommy Walker in Alabama

N8701T  Getting ready to put the    wings on.

Do Not Archive anything I write

"When Chris Heintz    designed the 701 he put a two-stroke 60HP up front. There was mention some    years ago of one flying with 40 horses up front. Obviously neither of these    engines pose any  	  Quote: 	
		  



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

List href="http://www.matronics.com/Navigator?Zenith701801-List">http://www.matronics.com/Navigator?Zenith701801-List

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ms.matronics.com/">http://forums.matronics.com

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

tp://www.matronics.com/contribution">http://www.matronics.com/contribution

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  [quote][b]

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ch701builder(at)yahoo.com
Guest

Posted: Sat Oct 03, 2009 7:14 am Post subject: A not-so-busy fternoon

HI John,

I still haven't made it out to your place yet, but I am wanting to. 



Also, I guess a way to work with the RPM issue would be to use a variable pitch prop like airmaster or IVO. Also, do you know how the cooling issues are coming along with the 3300?



Is the other guy you are talking about, Stan, up North around the  Denver area?



Keith

Divide CO

N 38.9940

W 105.1305

Alt. 9,100'

**********************************************

From: "JohnDRead(at)aol.com"  <JohnDRead(at)aol.com>

To: zenith701801-list(at)matronics.com

Sent: Friday, October 2, 2009 11:18:56 PM

Subject: Re: Re: A not-so-busy fternoon



      Hi Keith;

             There  are a couple of us that are planning to fly 701's at high altitude in  Colorado. I am at 7200 feet and the other guys is at around 8500 feet elevation.  We are each using Jabiru 3300 engines. The 3300 is rated at 120 peak HP at sea  level, 100 continuous at our elevations we will be lucky to see about 80%  of the sea level power, further our props will not have the bite they would at  sea level. We are still limited to the max RPM at take off so we cannot up the  revs to compensate.

  

 John  Read

CH701 - Elbert CO - Jabiru 3300



Phone: 303-648-3261

Fax:  303-648-3262

Cell: 719-494-4567   

  In a message dated 10/2/2009 8:30:12 A.M. Mountain Daylight Time,  ch701builder(at)yahoo.com writes:

  	  Quote: 	
		        Hey Tommy,

I think that 80hp is OK, but since most of my flying will    be at 10,500' and above, an 80 horse engine will perform like a 50hp engine,    which really stinks.



I have had a hard time finding anybody who will    post some performance numbers for high altitude flying. There is a guy up in    the Denver area that has a 701 with a 914, that I would like to go see this    Winter.



Personal note: I should be down your way again around the last    week of Oct and first week of Nov. I might stop by again if you wouldn't    mind!!!



Keith

(still trying to buck rivet the cabin    sides)

************************************************



   

         From: Tommy Walker    <twalker(at)cableone.net>

To:    zenith701801-list(at)matronics.com

Sent: Thursday, October 1, 2009 7:29:58    PM

Subject:    Re: A not-so-busy fternoon



-->    Zenith701801-List message posted by: "Tommy Walker" <twalker(at)cableone.net (twalker(at)cableone.net)>



Zed,



I    agree.  I think the 912ULS is too much engine for the 701.  I guess    you can't really have too much power, but with the 100hp Rotax, it seems that    way.  



It seems to me the 912ULS just hurls the 701 into the    air.



I think, and if I were going to fly a 701 forever, I would try to    put a 912UL in it.  Both for fuel economy (regular gas) and smoother    engine.  



But the 912ULS will certainly get you in the sky in a    hurry.



Tommy Walker in Alabama

N8701T  Getting ready to put the    wings on.

Do Not Archive anything I write

"When Chris Heintz    designed the 701 he put a two-stroke 60HP up front. There was mention some    years ago of one flying with 40 horses up front. Obviously neither of these    engines pose any  	  Quote: 	
		  



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

List href="http://www.matronics.com/Navigator?Zenith701801-List">http://www.matronics.com/Navigator?Zenith701801-List====================================

ms.matronics.com/">http://forums.matronics.com====================================tp://www.matronics.com/contribution">http://www.matronics.com/contribution==================================== 	


	




  [quote]

[b]

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