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RV7 Take-off

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bgarlick(at)ford.com
Guest

Posted: Mon Apr 21, 2008 4:28 am Post subject: RV7 Take-off

Hello,   

I would appreciate some comments and advice from RV7 flyers about concerns I have with take-offs (landings are no problem).  

I operate an RV7 (Tailwheel, Lycoming 160 hp IO-320, Sensenich FP) in the UK from a 1,650 feet grass strip.  Most of the the airfields I visit are also grass, in various conditions and states of repair, with runways usually in the range 1,500 to 2,400 feet in length.     

The runways are seldom dead flat, and usually have various bumps and undulations.  I always seem to encounter one of these bumps or undulations just at the wrong time during the take-off run, whereby I get bumped into the air by the standard springy undercarriage when the aircraft is just not quite ready to fly, and then I usually manage a juggling act to keep it flying.  My friend has the same IO-320 engine, but with a VP Hartzell, which hauls his aircraft into the air without encountering the same situation…I'm beginning to think my engine / propeller combination is not suitable for the RV7 in these conditions!  

I've discussed my concerns with instructors but their advice seems to be the standard "get the aircraft balanced into a flying attitude and it will almost fly itself off at the right time"…Maybe that's part of my problem, the correct "flying attitude" during the take-off run? - I've tried various: tail down, tail a bit high, but the effects seem to be the same except that when the tail is a bit high, I'm sensing that the undercarriage legs are flexing too much over the runway undulations, with the potential risk of a prop strike.   As the runways are generally not very long, I always try to get the tail up into what I think is the correct attitude as soon as the aircraft is running straight (which takes quite a hefty shove forward on the stick), and I use 10 degrees of flap. - I'm not sure whether 20 degrees creates more drag than lift during the take-off?  

Grateful for any tips, techniques, or advice.  

Thanks  

Bill     [quote][b]

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bo124rs(at)hotmail.com
Guest

Posted: Mon Apr 21, 2008 5:39 am Post subject: RV7 Take-off

Bill, if what they are referring to in "it will fly itself off" is letting it fly itself, have you tried just going neutral on the elevator, ailerons into the wind and giving it power.  In non gusty conditions, the 7 will fly itself off quite nicely without you ever forcing the tail up or holding the tail down.  In this scenario, you are not forcing anything and it flies when it is ready.  It is about a non event kind of takeoff.



Dana Overall  

Richmond, KY i39 

RV-7 slider "Black Magic"  Flying

O 360 A1A, C/S C2YR-1BF/F7666A4 

http://rvflying.tripod.com/firstflight_010.jpg

http://www.youtube.com/watch?v=MMi05-WU2D0#GU5U2spHI_4

http://rvflying.tripod.com 

do not archive 



 	  Quote: 	
		  Subject: RV7 Take-off

Date: Mon, 21 Apr 2008 13:22:31 +0100

From: bgarlick(at)ford.com

To: rv7-list(at)matronics.com



    RV7 Take-off        Hello, 

  I would appreciate some comments and advice from RV7 flyers about concerns I have with take-offs (landings are no problem).

  I operate an RV7 (Tailwheel, Lycoming 160 hp IO-320, Sensenich FP) in the UK from a 1,650 feet grass strip.  Most of the the airfields I visit are also grass, in various conditions and states of repair, with runways usually in the range 1,500 to 2,400 feet in length.   

  The runways are seldom dead flat, and usually have various bumps and undulations.  I always seem to encounter one of these bumps or undulations just at the wrong time during the take-off run, whereby I get bumped into the air by the standard springy undercarriage when the aircraft is just not quite ready to fly, and then I usually manage a juggling act to keep it flying.  My friend has the same IO-320 engine, but with a VP Hartzell, which hauls his aircraft into the air without encountering the same situation…I'm beginning to think my engine / propeller combination is not suitable for the RV7 in these conditions!

  I've discussed my concerns with instructors but their advice seems to be the standard "get the aircraft balanced into a flying attitude and it will almost fly itself off at the right time"…Maybe that's part of my problem, the correct "flying attitude" during the take-off run? - I've tried various: tail down, tail a bit high, but the effects seem to be the same except that when the tail is a bit high, I'm sensing that the undercarriage legs are flexing too much over the runway undulations, with the potential risk of a prop strike.   As the runways are generally not very long, I always try to get the tail up into what I think is the correct attitude as soon as the aircraft is running straight (which takes quite a hefty shove forward on the stick), and I use 10 degrees of flap. - I'm not sure whether 20 degrees creates more drag than lift during the take-off?

  Grateful for any tips, techniques, or advice.  

Thanks  

Bill 

     	  Quote: 	
		  



et="_blank">http://www.matronics.com/Navigator?RV7-List

tp://forums.matronics.com

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



	
	
Get in touch in an instant. Get Windows Live Messenger now.  [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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g4mech(at)sbcglobal.net
Guest

Posted: Mon Apr 21, 2008 6:43 am Post subject: RV7 Take-off

Bill,   

   

I have a few airports here in Los Angeles that have “bumps” in the perfect spot also. They seem to be right about 40 knots…..anyway I have a fixed pitch with 0-360 and what works for me is once I have 30ish knots, the tail is gently “told” to go to a flying position and if I encounter the bumps then she just bounces in the air a bit, the acceleration usually pulls me right up to flying speed lickity split. As far as having a higher tail, lower tail or anything like that I always take off the same way. I have never heard of anyone trying to use 20 flaps and I don’t see how that will help anything, but 10 is a setting which lots of guys use. I personally never use flaps for take off but I don’t go off strips shorter than 2K feet, (none in LA). I have spent a fair share of time in dry lake beds and even then I don’t use 10. I would also agree with Dana as far as a nice neutral elevator and let the wings do their job. Just my 2 cents.  

   

Mike  

RV-7 Slider  

406 Hrs  

         

  

From: owner-rv7-list-server(at)matronics.com [mailto:owner-rv7-list-server(at)matronics.com] On Behalf Of Dana Overall

 Sent: Monday, April 21, 2008 6:34 AM

 To: rv7-list(at)matronics.com

 Subject: RE: RV7 Take-off  

  

   

Bill, if what they are referring to in "it will fly itself off" is letting it fly itself, have you tried just going neutral on the elevator, ailerons into the wind and giving it power.  In non gusty conditions, the 7 will fly itself off quite nicely without you ever forcing the tail up or holding the tail down.  In this scenario, you are not forcing anything and it flies when it is ready.  It is about a non event kind of takeoff.

 

 Dana Overall 

 Richmond, KY i39 

 RV-7 slider "Black Magic" Flying

 O 360 A1A, C/S C2YR-1BF/F7666A4 

 http://rvflying.tripod.com/firstflight_010.jpg

 http://www.youtube.com/watch?v=MMi05-WU2D0#GU5U2spHI_4

 http://rvflying.tripod.com 

 do not archive       

  

Subject: RV7 Take-off

 Date: Mon, 21 Apr 2008 13:22:31 +0100

 From: bgarlick(at)ford.com

 To: rv7-list(at)matronics.com

 

 Hello, 

 I would appreciate some comments and advice from RV7 flyers about concerns I have with take-offs (landings are no problem).

 I operate an RV7 (Tailwheel, Lycoming 160 hp IO-320, Sensenich FP) in the UK from a 1,650 feet grass strip.  Most of the airfields I visit are also grass, in various conditions and states of repair, with runways usually in the range 1,500 to 2,400 feet in length.   

 The runways are seldom dead flat, and usually have various bumps and undulations.  I always seem to encounter one of these bumps or undulations just at the wrong time during the take-off run, whereby I get bumped into the air by the standard springy undercarriage when the aircraft is just not quite ready to fly, and then I usually manage a juggling act to keep it flying.  My friend has the same IO-320 engine, but with a VP Hartzell, which hauls his aircraft into the air without encountering the same situation…I'm beginning to think my engine / propeller combination is not suitable for the RV7 in these conditions!

 I've discussed my concerns with instructors but their advice seems to be the standard "get the aircraft balanced into a flying attitude and it will almost fly itself off at the right time"…Maybe that's part of my problem, the correct "flying attitude" during the take-off run? - I've tried various: tail down, tail a bit high, but the effects seem to be the same except that when the tail is a bit high, I'm sensing that the undercarriage legs are flexing too much over the runway undulations, with the potential risk of a prop strike.   As the runways are generally not very long, I always try to get the tail up into what I think is the correct attitude as soon as the aircraft is running straight (which takes quite a hefty shove forward on the stick), and I use 10 degrees of flap. - I'm not sure whether 20 degrees creates more drag than lift during the take-off?

 Grateful for any tips, techniques, or advice. 

 Thanks 

 Bill    	  Quote: 	
		    et="_blank">http://www.matronics.com/Navigator?RV7-Listtp://forums.matronics.com_blank">http://www.matronics.com/contribution 	
  

       

  

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