Aces High Bulletin Board
General Forums => Aircraft and Vehicles => Topic started by: Reynolds on December 27, 2006, 05:22:28 PM
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That hapens to me a lot. And so here is my question. Are best-glide-speeds modeled into the game? If so what is best glide for the following planes:
Bf-109G6/G14
Spitfire I/IX
Mosquito
Hurricane I/IIC
P-40B/E
Thanks in advance!
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A good rule of thumb is to use the default auto climb speed. You lower the speed too much and you increase the AoA, creating more drag (and thus slowing you down, bleeding the E off even worse). You increase the speed too fast and you lose alt too fast.
I've made it home after losing an engine from a sector away before. I think I'm quite adept at it. I often use default auto climb speeds.
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Originally posted by Krusty
A good rule of thumb is to use the default auto climb speed. You lower the speed too much and you increase the AoA, creating more drag (and thus slowing you down, bleeding the E off even worse). You increase the speed too fast and you lose alt too fast.
I've made it home after losing an engine from a sector away before. I think I'm quite adept at it. I often use default auto climb speeds.
Alright. Ill give that a try. I usually use around 120 regardless of plane.
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I'm going to assume that you know to "feather the prop" when gliding home:
Press the Keypad "-" key to feather it. If you're only killing the engine to save fuel and you start it again to land, press the keypad "+" key to "hook it up again."
You can glide almost twice as far with the propeller "feathered."
-Llama
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Feather it if it's still servicable. If it's 100% killed (dead, not spinning) you can't do anything.
Technically it's not "feathering", as the blades don't turn completely forward, unless you fly certain planes that feature this, like the P38. You're really just reducing RPM so that there's less of an air brake on the front of your plane.
If you've still got a servicable engine but are losing oil, climb for home at full WEP. You have an oil gauge in your cockpit. When it gets down to below 50, kill the engine, reduce RPM and glide. You might need that last bit of oil to land (if you have to manuver around some trees or are coming in just a hair too slow).
10k alt and moderate speed should get you 30mi or more safely with engine off. 15k you can glide for almost 1.5 sectors or more. That's why I say climb at full WEP. Engine temp and gas mean little when your oil will run out before either. If you're already at alt, level out and WEP for home (just to get there faster, and if you have to kill the engine you can climb or coast on the speed you have).
All probably obvious, but I thought I'd spell out a few things I do.
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Yeah, I can get home one barely any fuel, or barely any oil, im asking about when its completely dead. So, auto-climb speed?
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I'd say so.
When completely dead, don't try coaxing too much out of it. If you're not going to make the field, find a clearing in the trees and set down. You might need to use what alt you have left just to avoid the fershlugginer trees.
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The best glide speed is:
Hit
Dont hit .
Problem solved.
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lol. Id rather ditch then bail. I dont know if its my instructors wife's reaction anytime the subject of her precious plane crashing is brought up, but it always seems id be better off riding it in, and doing my best to keep it in one piece.
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Originally posted by Reynolds
lol. Id rather ditch then bail. I dont know if its my instructors wife's reaction anytime the subject of her precious plane crashing is brought up, but it always seems id be better off riding it in, and doing my best to keep it in one piece.
If the engine quits on you that airplane just betrayed you. Smash it, kill it, destroy it, use it and abuse it if it means you and your passengers get out alive.
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lol. Sure, get the passengers out, but I DEFINATELY dont want to explain it to the instructor's wife...
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I'll be sure to have that engraved in your headstone.
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Originally posted by Golfer
I'll be sure to have that engraved in your headstone.
Please do! :D
(I hope you realize im joking...)
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The best thing u can do, is put ur head between ur knees, and kiss ur but goodbye
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NOw is that the "-" and "+" on the key pad as in rpm... casue thats makeing sence to me
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Originally posted by AX_00
NOw is that the "-" and "+" on the key pad as in rpm... casue thats makeing sence to me
How's that ESL class working out for you?
:D :D :D
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what if english isn't his first language, scotty? Might not be pretty but it's an effort.
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Originally posted by Golfer
what if english isn't his first language, scotty? Might not be pretty but it's an effort.
I figured it's a 50/50 shot of being either funny or really offensive.
However, some of the posts I've read recently from people who are neither foreigners nor homeless uneducated people have me convinced there is either a serious literacy problem or an over/under-medication problem.
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Those aren't good enough odds to justify the risk, scotty. I'd say err on the side of caution next time.
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Originally posted by Golfer
Those aren't good enough odds to justify the risk, scotty. I'd say err on the side of caution next time.
Thanks so much for your opinion. Noted.
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Originally posted by Golfer
Those aren't good enough odds to justify the risk, scotty. I'd say err on the side of caution next time.
Id say go for it. Until he posts a location, its actually a fair bet that english IS his first language.
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Originally posted by scottydawg
I figured it's a 50/50 shot of being either funny or really offensive.
However, some of the posts I've read recently from people who are neither foreigners nor homeless uneducated people have me convinced there is either a serious literacy problem or an over/under-medication problem.
I didn't find it offensive and thought it was rather funny but then again, I'm not the one you quoted.
ack-ack
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Originally posted by strunk, white & scottydawg
Thanks so much for your opinion. Noted.
Failure to double space after a period & 2nd sentence is incomplete = pwnt
OMFG noob is teh foreign trrst or dumar than dann quail lols
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Reducing RPMs and reaching 0 airspeed by stalling the plane in a 90 degree climb will stop your prop from spinning. If you can manage to recover from the nasty ensuing stall, you will be able to glide much more efficiently.
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I've wondered why Vy & best glide are not the same speed, cause best glide is the highest possible rate of climb, but the climb rate is a negative number...:confused: :confused: :confused: :confused: :confused: :confused: :mad: :mad: :noid
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Originally posted by AquaShrimp
Reducing RPMs and reaching 0 airspeed by stalling the plane in a 90 degree climb will stop your prop from spinning. If you can manage to recover from the nasty ensuing stall, you will be able to glide much more efficiently.
Really? Is the effectiveness worth the loss of altitude the stall will inevetably cause?
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If that's true, it's surely a bug. If the airflow is strong enough to keep the propeller spinning before the stall, then once the stall is recovered from and normal airflow resumed the propeller should begin rotating again.
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Nooooooooooooooooope. Not necessarily
And don't call me Shirley.
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I hate to get back on subject, but I too wonder what the best glide speed is for the planes I fly.
I usually use the default alt-x speed but sometimes I edit it with the .speed command and don't know what it is for sure. And when I need it most I want it to the nearest mph!
Now, for extending the glide when the engine is dead, use the Numpad "-" key - it makes a HUGE difference.
I discovered that the 190 can actually maintain alt & get home with no radiator by running at full throttle at best climb speed. When temp gets too high cut off engine, feather prop, & cool the engine. When it's cooled off , unfeather the prop "+" key and go to full power best climb speed again. Repeat as needed. I flew 40 miles with no radiator starting at 2k alt and almost overshot the landing!
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Originally posted by Golfer
Nooooooooooooooooope. Not necessarily
All right, why?
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Best glide speed occurs when an aircraft's lift-to-drag ratio is at it's maximum. This happens to correspond very closely to best climb speed (best rate of climb) which is the default speed for ALT-X in the game.
The speed for max L/D varies between aircraft owing to different lift and drag charcteristics of each aircraft. Your best bet is to reduce rpm (feather the prop as much as you can) and then hit ALT-X using the default speed in AH for the particular aircraft.
The default speed for ALT-X in AH is automatically set for each aircraft for the best climb speed of that aircraft. HTC will need to confirm but I believe this self adjusts based on the weight of the aircraft at that moment in time as well.
Tango, XO
412th FS Braunco Mustangs
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Originally posted by Reynolds
Id say go for it. Until he posts a location, its actually a fair bet that english IS his first language.
Well, id say BET AGAIN.
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dtango: Best climb rate is set for each plane, but does not change with different plane loadouts ,fuel, or altitude.
Best glide speed is normally very close to Vy, I.E. best climb speed and should be the same on planes with feathered props.
When you put prop drag into the equation , I havn't confirmed the physics just a gut guess, the best glide speed would be slightly slower than Vy.
HiTech
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Ah, thanks for the clarification HT. I must be losing my braincells faster than I realize! Got confused with changes in rate-of-climb with different weights and forgot that velocity for best-rate-of-climb is constant no matter the weight.
Debonair- I just noticed your post. Here's a graph to explain the difference between Vy and Vbg.
(http://brauncomustangs.org/images/pa-pr.jpg)
The reason Vy just slightly higher than Vbg (or velocity for L/D max) is because piston engine prop plane power available doesn't reach it's peak until somewhere greater than velocity for max L/D ratio. I believe this is because prop efficiency doesn't reach it's maximum until higher velocities even with constant speed props.
On the graph Vbg would be at the lowest point of the PR graph, while Vy is where excess power is at max (PA-PR) which is further to right of Vbg in terms of velocity.
Tango, XO
412th FS Braunco Mustangs