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takeoff landing data on firestar and firefly?

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grantr

Joined: 12 Sep 2007
Posts: 217

Posted: Tue Aug 05, 2008 9:55 am Post subject: takeoff landing data on firestar and firefly?

Does anyone have any data on the Firefly and Firestar regarding takeoff distance and landing distance on grass. Also climb rate.



I am looking at a house with some adjoining land however the longest leg is about 820 feet for the runway. There are trees on one end and more pasture on the other end. It may be possible to buy more land to extend it to extend it to 1438 feet.



How many of you have private grass strips? What are the dimensions of the strip how far are the trees away from the centerline of the runway? I want to make sure to buy enough land so that if the neighbor decides to plant trees on the land line, it will not ruin my airstrip.



Is an 800 foot strip long enough  for either plane with 60 to 70' trees on the end? My elevation is around 500' msl



I was thinking 200' wide for the strip width.

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tkrolfe(at)toast.net
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Posted: Tue Aug 05, 2008 11:43 am Post subject: takeoff landing data on firestar and firefly?

grantr wrote:

 	  Quote: 	
		   



 Does anyone have any data on the Firefly and Firestar regarding takeoff distance and landing distance on grass. Also climb rate.



 I am looking at a house with some adjoining land however the longest leg is about 820 feet for the runway. There are trees on one end and more pasture on the other end. It may be possible to buy more land to extend it to extend it to 1438 feet.



 How many of you have private grass strips? What are the dimensions of the strip how far are the trees away from the centerline of the runway? I want to make sure to buy enough land so that if the neighbor decides to plant trees on the land line, it will not ruin my airstrip.



 Is an 800 foot strip long enough  for either plane with 60 to 70' trees on the end?



 I was thinking 200' wide for the strip width.

   

Grant,
	




100' wide is more than enough!  800' long is plenty to accommodate your 

Firefly, but of course that depends on your flying skills. 



I have my own grass strip which is 100' x 1300' long, but then that was 

the deal I had to make to lease it.  it also met the minimum 

requirements to register the airstrip with the state and FAA.  Look up 

14PS on Airnav. com.  The 100' wide is nice on cross winds especially 

with the tall corn on each side right now, but really not necessary.  

The 1300' long is more than I need or wish to mow!  If I could 

re-negotiate the deal I would opt for 800' long.  And yes, I have tall 

trees at the one end!!!  Not a problem.  I most always land in the other 

direction, but when wind conditions require, rather than coming in over 

the trees, I approach from a 90 deg. angle and then just turn and land.  

That's the great part of having a FireFly, it's ability to put down in 

not much space. The FireStar can do the same!



Take off is about 200' to 300' depending on conditions and with a climb 

rate of 1000' a minute there is not a problem.  You said you would have 

a pasture at the one end and that gives you a major safety valve.



Hope this helps you,



Terry -  FireFly #95

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jbhart(at)onlyinternet.ne
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Posted: Wed Aug 06, 2008 4:51 am Post subject: takeoff landing data on firestar and firefly?

At 10:55 AM 8/5/08 -0700, you wrote:

 	  Quote: 	
		  



Is an 800 foot strip long enough  for either plane with 60 to 70' trees on the end?



I was thinking 200' wide for the strip width




	


Grant,



You can calculate the required climb rate to clear the trees.  



Assume a 200 run to lift off and climb speeds of 40 and 50 mph with 600' to 

go to clear the 70' tree.



The time to travel the 600' at 40 mph is:



600(ft)/[40(mi/hr)x5280(ft/mi)/60(min/hr)] = 0.170(min)



The time to travel the 600' at 50 mph is:



600(ft)/[50(mi/hr)x5280(ft/mi)/60(min/hr)] = 0.136(min)



These are the times required to to clear the tree.  The vertical speeds 

required can be found by dividing these times into the height of the 

tree.



At 40 mph -> 70(ft)/0.170(min) = 412(ft/min)



At 50 mph -> 70(ft)/0.136(min) = 515(ft/min)



Most normal performing FireFlys will have no trouble clearing the tree.



Jack B. Hart FF004

Winchester, IN

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