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601 XL Slow Flight Speeds

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japhillipsga(at)aol.com
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Posted: Thu Mar 15, 2007 8:13 am Post subject: 601 XL Slow Flight Speeds

Dear Thread Friends, can anybody provide data on your XL speeds so I can compare with my info ? Need to be equipped with a Jab 3300 with standard FWF Sensenich prop and old style wheel pants. What is best glide speed without and with flaps ? Best climb speed ? Hope to hear back from several of you fine folks, best regards, Bill of Georgia

   N505WP

   601XL-3300 106 Hrs

    

  

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amyvega2005(at)earthlink.
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Posted: Thu Mar 15, 2007 9:50 am Post subject: 601 XL Slow Flight Speeds

bill,

how is the plane flying, what cruise speeds are you getting, EGT and RPMs?



Juan 601/3300



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japhillipsga(at)aol.com
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Posted: Thu Mar 15, 2007 10:33 am Post subject: 601 XL Slow Flight Speeds

Juan, cruise at 2700 rpm is 138 mph. I have had it somewhat faster as the rpms go up. EGTs are unbalanced as I made significant mods to the left side cooling ducts and all that extra cool air for the CHTs reduces the left side EGT prob attached to the left side exhaust pipe at cruise. Bill

    

  

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klaus(at)utdallas.edu
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Posted: Thu Mar 15, 2007 1:04 pm Post subject: 601 XL Slow Flight Speeds

Hi Bill,



You can determine the desired numbers yourself rather easily, as follows.



Get enough altitude, reduce engine rpm to elevated idle so that the

engine is neither pulling nor being pushed, and gradually reduce 

airspeed while watching

the rate-of-climb instrument. When you get the smallest rate of descent,

you basically have the optimum glide speed. Do this twice, once with 

and  once without flaps.



There are two best climb speeds. One maximizes the altitude gained per 

minute; this

speed is called Vy. The other one maximizes the altitude gained per 

nautical mile traveled

forward; this is Vx.



To get Vy, fly various various speeds until the  rate-of-climb 

instrument shows the max value.

To get Vx, again try various speeds until the altitude gained per 

nautical mile traveled

is max. You get the latter distance with GPS.



Typically Vx is max when you use optimum glide speed, so no measurement 

is actually needed

once you have the optimum glide speed.



One note of caution: The numbers vary significantly with payload. So you 

may to do this twice,

once with pilot only and little fuel, and once near gross weight. That 

gives you two

sets of numbers to work with. Generally, both Vx and Vy increase as 

payload increases.

In a plane like the 601XL the increase is substantial since max payload 

is a large percentage

of empty weight.



A good good rule for cruise climb speed is Vx + 2(Vy-Vx). For example, 

if Vx = 60 kts

and Vy = 70 kts, then a good cruise climb speed is 60 + 2(70-60) = 80 

kts. BTW, these

are roughly the numbers for my 601HDS with Rotax 912, using custom 

fairings for the wing roots,

for payload near gross weight. I would guess similar results hold for 

you plane.



Happy flying!



Best wishes,



Klaus Truemper



-- 

Klaus Truemper

Professor Emeritus of Computer Science

University of Texas at Dallas

Erik Jonsson School of Engineering and

  Computer Science EC31

P.O. Box 830688

Richardson, TX 75083-0688

(972) 883-2712

klaus(at)utdallas.edu

www.utdallas.edu/~klaus

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