How does best glide in a Maule with zero flaps compare with best glide at -7?

dirtstrip wrote:How does best glide in a Maule with zero flaps compare with best glide at -7?

Never tried it, but best I remember the best glide is obtained with 0 flaps as adding -7 decreases the lift generated by the wing in order to decrease parasitic drag and (in theory) increase airspeed. That is how I understood the principle to work anyway, but I may not be remembering it correctly.

Maule.....Glide.....Isn't that an oxymoron?????

MTV

mtv wrote:Maule.....Glide.....Isn't that an oxymoron?????

MTV

To quote Woody...it's falling with style.

I am, I said, to no one there.
Is there a reason for this question? the chair asked. Why yes. dirtstrip answered. The same angle that produces best lift to drag in glide also is nearly the same angle that the wing has to oncoming air when it is in its best angle for climb, but in cruise we use reflex flaps to destroy excess lift and drag to pick up some airspeed and go further on the same power setting. Then the best angle for glide must be more efficient at higher speeds with reflex flaps than zero flaps. Does the Maule then have two different best glide speeds one for higher speeds and reflexed flaps and when slowing have a second best glide at zero flaps that is more efficient for the lower speeds? If so, what speed does it begin to favor the other?
What say the chair.

dirtstrip wrote:What say the chair.

Jeremy oh Jeremy, where for art thou Jeremy?

I would bet he has the answer to this quandary...

Is Jeremy Maule.com?

dirtstrip wrote:Is Jeremy Maule.com?

Yes...Jeremy Ainsworth...a veritable walking Maule Encyclopedia

He might be out of town for awhile!!
GT

Best angle of glide for the Maule M5 is 80 mph no flaps, best angle of climb 75 mph and best rate of climb 90 mph. That 80 mph glide is one airspeed that is "burned" into my memory as the emergency airspeed for engine out by David Shapiro, from whom I got my Maule training.

My normal climb speed on take off is 80 mph, too. I hope this helps. I don't have the fancy -7 stuff, can't help you with that. Jeremy will know, he's not far away....

Don

Jeremy might be in transit to far away!
The old rule of thumb I was taught was trim all the way nose up and then you don't have to worry about it! Then you can figure out why you are gliding, just one thing you don't have to keep an eye on, just keep the ball centered
Try it, Supposed to work when your IFR and your motor quits?
I know my cousin who said his brother in law told him it worked for a friend of his!
90 mph / 2000' / 500' per min = 4 minutes to sea level or 4x1.5= 6 miles
80-5.3 miles aprox.
70 4.6 miles aprox.
60 mph / 2000' / 500' per min = 4 minutes to sea level or 4x1= 4 miles
Not sure the decent rate at best speed, but these are the decent rate of my old M6 with the yoke pulled all the way back and no power mushing fall out of the sky landing speeds, 700pm with full flaps.
I think livable if you fly it all the way to the ground either way, just make sure you push it over and pick up a little speed to land on your wheels.
My $.03
GT

M6RV6 wrote:Jeremy might be in transit to far away!
The old rule of thumb I was taught was trim all the way nose up and then you don't have to worry about it! Then you can figure out why you are gliding, just one thing you don't have to keep an eye on, just keep the ball centered
Try it, Supposed to work when your IFR and your motor quits?
I know my cousin who said his brother in law told him it worked for a friend of his!
90 mph / 2000' / 500' per min = 4 minutes to sea level or 4x1.5= 6 miles
80-5.3 miles aprox.
70 4.6 miles aprox.
60 mph / 2000' / 500' per min = 4 minutes to sea level or 4x1= 4 miles
Not sure the decent rate at best speed, but these are the decent rate of my old M6 with the yoke pulled all the way back and no power mushing fall out of the sky landing speeds, 700pm with full flaps.
I think livable if you fly it all the way to the ground either way, just make sure you push it over and pick up a little speed to land on your wheels.
My $.03
GT

Isn't that the procedure in the POH of an AN-2?

Anyone know how many FPM of decent the landing gear of most light aircraft can take?

M6RV6 wrote:Jeremy might be in transit to far away!
The old rule of thumb I was taught was trim all the way nose up and then you don't have to worry about it! Then you can figure out why you are gliding, just one thing you don't have to keep an eye on, just keep the ball centered

I was told full nose up trim is very close to best glide in most planes too. Still wondering about these planes in the reflex flaps position though.

Go out and give it a try, I bet you are with in 3 mph with or with out the negative, let me know.
Thanks GT

83 mph is best glide airspeed in my Maule MX-7-180 with flaps at 0 degrees. I only use the -7 degree flap setting during cruise to reduce the induced drag somewhat. It will usually produce only two or three mph of increased airspeed but every little bit of drag reduction helps reduce fuel consumption and cost. The faster the airspeed the more reduction in drag you get with the negative flap setting due to drag being proportional to the square of airspeed. The drag reduction that you get in an 83 mph glide by using the negative flap setting is insignificant compared to the loss of lift.

The Maule is faster to begin with than my Tundra. I get 6-8 mph increase at -8 flaps in cruise. This probably has to do with the deeper chord wing creating more induced drag so reflexing flaps gets more response. I had this question in my mind about the glide and reflex flaps of the Maule. My bird is down for repairs and there are many Maule pilots out there. I will be trying all this for myself later. Thanks for the posts.

UtahMaule wrote:Anyone know how many FPM of decent the landing gear of most light aircraft can take?

The Bearhawk is designed and tested for 10ft/s "landing" at 2500lbs, 600ft/m, I dont know what it can actually take before breaking, but it's probably a little more. But that is more than I'd ever want to be on-board for!!!
The gear design is very similar to Maule oleo gear.

When you reflex the flaps, the nose pitches down yes - less lift.
So with less lift, surely the best glide speed is faster, the angle is steeper, which gets you to terrafirma more quickly....?

What's all the flap about.
When you apply reflex (up) flaps, the rear of the plane goes down thus the nose pitches up.
At a constant glide speed of 80 mph IAS with lightly loaded plane at 6500 DA initial, the descent is just over 900 fpm with flaps neutral and 950 fpm with -7 deg.
At 85 mph the descent is closer to 1000 fpm neutral flaps and 1030 fpm with -7deg.
Answer to the initial question is that you will get a better glide with neutral 0 deg flaps rather than -7 deg flaps.
With a loaded airplane on a standard day the best glide will compute to approx 8:1 glide ratio.
Light weight, you may achieve 7.5:1
At 40 degrees flap and speed of 48mph the descent will be 700 fpm
At 48 degrees flap and speed just above the nose down break descent will be 660 fpm.
Take into account that CG position makes a difference as does gwt used.

I have heard a C150 can get 10:1 ratio.
Barry Schiff once wrote (I think) a C150 at 5280 ft (1 mile)above the ground has 960 square miles in which to land. You only have to pick one of them. Someone could check the math on this.
I have also heard that certified landing gear must accept 600 fpm impact. ABW may be able to clarify this.

I forgot to point out that at the lighter weights, the best glide speed is less to get the same glide ratio as the POH published speed which is at Gross weight.