Linked Questions

0 votes
0 answers
175 views

How to calculate Vx for a propeller driven airplane? [duplicate]

I know that Vx for jet engines airplane is at Vmd and that Vy is at 1.32 Vmd; I do also know that Vy for propeller airplanes is at Vmd. Now I cannot figure out where i can get the Vx for propellers.
Andrea Ghilardi's user avatar
10 votes
4 answers
3k views

How can best glide speed be lower than best rate of climb speed?

I was looking up V-speeds for C172. I don't have easy access to an official copy of the POH, but online I found: $V_y$, best rate of climb speed (at sea level): 76 KIAS (p22) $V_{glide}$, maximum ...
Jan Hudec's user avatar
  • 56.3k
7 votes
4 answers
6k views

What is the relation between aircraft descent rate and speed?

I am an ATCO working in India. I am trying to understand why an aircraft's rate of descent increases, when its speed increases. I am particularly interested in how it relates to jet engine aircraft. ...
joydeep's user avatar
  • 211
6 votes
2 answers
20k views

What is the typical climb angle (versus the ground) of a single engine piston plane?

What are the normal climbing angles against ground on a SEP (single engine piston) plane and an airliner? (no wing-air angles in here, but the climb angle when watched from the side of the plane) (...
user11961's user avatar
6 votes
2 answers
1k views

Why do Vx and Vy coalesce at an airplane's absolute ceiling?

I'm struggling to figure out why that is the case. I'm trying to determine why the best angle of climb speed equals to best rate of climb speed at the absolute ceiling on airplanes.
nyorkr23's user avatar
  • 1,188
6 votes
2 answers
3k views

How does climb-rate vary with density/pressure altitude?

I'm seeking to write a little web or phone app which can help me choose the best cruising altitude based upon winds aloft. I know Garmin Pilot (and probably Foreflight) have a cruising altitude ...
Jemenake's user avatar
  • 309
2 votes
4 answers
2k views

How does setting takeoff flaps improve aircraft performance?

A study guide I recently found indicates that Vmc and aircraft performance improve with takeoff flaps set. The Vmc improvement makes sense but the performance improvement does not. At a basic level, ...
acpilot's user avatar
  • 6,016
2 votes
1 answer
1k views

Does the flap settings for the best lift/drag ratio change with speed on the Diamond DA20-A?

As I've recently started time building in DA20, I've noticed the AFM suggests flaps at T/O for a glide. Being very intrigued by this I run across this post. Although I appreciate Peter's reply that ...
Flion's user avatar
  • 55
3 votes
3 answers
1k views

For a flying wing airfoil, which AOA is to consider when selecting Cl?

I'm in the process of designing a flying wing. I'm trying to keep it a small as possible, so the lift coefficient is very crucial for me. I'm currently looking at some airfoils but most of them ...
Diamondx's user avatar
  • 241
0 votes
4 answers
2k views

How to calculate optimal flight climb angle?

I am trying to calculate the optimal flight climb angle based off of some basic power calculations for an aircraft on steady climb with an angle of theta. Doing a balance of forces I obtained the ...
Pablo's user avatar
  • 25
2 votes
1 answer
759 views

How to calculate the best climb rate and glide rate?

Considering the lift equation $$L = C_L \frac{1}{2}\rho v^2 s$$ Given $P$ is 1,000 ft, $\rho$ is 0.002308, and $V$ is the cruise speed of a Piper Archer or 126 knots, we get $$L = (0.4) (0.002308) (...
Aishve Torah's user avatar
3 votes
1 answer
257 views

What would the effect be of flap deployment on a UAV such as the Reaper or Predator?

I've read answers that said that the climb performance is usually worse with flaps extended, and the pilots would, if they could, just retract them and get into a clean config as soon as possible. ...
Sharva Potdar's user avatar
1 vote
2 answers
318 views

Determine Vx and Vy from other climbing rate datas

I am developing a small program, working with Microsoft Flight Simulator 2020. For now, I can show my takeoff graph which display the altitude on the y axis and the distance in x axis. I would like to ...
Thibaultblf's user avatar
3 votes
1 answer
357 views

Is V best endurance configuration the best way to save a heavily overloaded aircraft?

After reading this, we all agree "the experienced pilot takes over, lowers the nose, and the plane is saved". Not bad advice, but what speed offers the greatest amount of excess thrust ...
Robert DiGiovanni's user avatar
1 vote
1 answer
139 views

In what scenarios would one want to maximize or minimise rate of climb in an aircraft? [closed]

What are examples of scenarios where a pilot would want to maximise or minimise aircraft rate of climb? What performance metrics should one consider to analyse steady climbing flight? The scenarios I ...
chaithanya's user avatar