Thread Tools
Old 05-23-2006, 11:50 AM
Guest
Join Date: Sep 2002
Location: Ess Eff
Posts: 2,129
Aerobatics: chandelle vs hammerhead stall

What's the difference between a chandelle and a hammerhead stall?
Old 05-23-2006, 12:09 PM
Guest
Join Date: Jun 2003
Location: Look up, look down.
Posts: 670
A chandelle is basically a high-bank turn, performed while ascending at a high rate, the going back down.

A hammer head is a much more vertical maneuver, putting much more stress on the aircraft.

There's a good description of both on Wikipedia's aerobatic maneuver page.
Old 05-23-2006, 12:26 PM
Guest
Join Date: Sep 2002
Location: Ess Eff
Posts: 2,129
Yeah, that's actually where my question comes from as I can't seem to grok the difference in the Wikipedia descriptions. I know that a hammerhead uses rudder, but they both look the same to me. I'm wondering, not just how their performed, but how they look different to a spectator.
Old 05-23-2006, 03:04 PM
Guest
Join Date: Apr 2001
Location: The tropics
Posts: 6,792
They look very different. A chandelle is basically a climbing turn. The plane starts in level flight, banks, then climbs while turning. In a hammerhead, the plane enters a vertical climb, loses airspeed, and appears to stop in midair (hence the name stall turn). At the top of the climb the plane yaws left or right to point vertically towards the ground. It gathers airspeed, then straightens out to level flight.
Old 05-23-2006, 03:16 PM
Guest
Join Date: Apr 2001
Location: The tropics
Posts: 6,792
Here's a chandelle: http://nasascale.org/maneuvers/chandelle_turn.htm
Here's a hammerhead: http://geistware.com/rcmodeling/...stall_turn.htm. Note that maneuver is performed in a vertical plane, unlike the chandelle.
Old 05-23-2006, 04:04 PM
Guest
Join Date: May 2005
Posts: 5,890
In a Chandel, the aircraft is basically flown through the entire manuever, with plenty of airspeed over the top....though this could still be well below the "stall speed" for level flight.

In the hamerhead, it stops flying at the top. While refered to as a "stall" this is inaccurate by the aerodynamic definition. In vertical flight, the wings are unloaded, the vertical parts of the manuever requires them to produce no lift, in such a condition, stalling is impossible.

When the aircraft stops at the top (actually just before), rudder is applied to yaw the aircraft. The rudder is effective at zero speed, as it is in the prop wash. Gliders have to fudge and kick the rudder while there is still some airspeed to initiate the yaw.
Old 05-23-2006, 04:34 PM
Guest
Join Date: Sep 2002
Location: Ess Eff
Posts: 2,129
OK here's full disclosure:

I fly (high performance) model gliders. We fly at steep slopes where wind is perpendicular to the slope, generating "slope lift". OK. We often do maneuvers that we call "half pipes" or "pumps", often with planes that have only Aileron and Elevator controls. The idea is very much life a skate/snowboarding halfpipe. From level flight, we pull into a maximum climb (often very close to verticle). Near the apex of the climb (airspeed approaching zero), a very slight aileron input is given, causing the plane to essentially pivots around the "lowered" wing, hanging in the air. Opposite aileron is given to straighten the plane out as it dives. Slowly pull up and do the same thing up the other side. If timed and executed well, the plane will gain height (and speed) with each pump.

I've always considered these to be hammerhead stall turns, but was recently told that they're actually Chandelles or wing-overs since a true hammerhead requires rudder and power. While I don't necessarily dispute the definition, I can't see how they'd look any different to a spectator.
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:27 AM.

Copyright © 2017
Best Topics: coin jar estimator fencing dagger operator number 9 clogged toilet drano pirate fiction salt watermelon range of shotgun stretchy shirt material protest permit opium hallucinations christmas car ads magnum cartridge dishwasher hands the affected area ferret kills cat pop rocks banned uhaul vs pods scary nicknames pixelated dildo jcpenney thongs fuck calculus hey jambo jambo claritin overdose please insert girder flintlock pistol weight sell herbalife rule 34 bimbofication edd degree meaning deborah gibson playboy bleach dollar bill stripper board patri-archie build a pier how many hp is 190cc accidentally put brake fluid in power steering when are you no longer young ball on top of flagpole called it's good to own land personalized teacher gifts under was eisenhower a jew medicine side effects funny daniel boone was a man song frying frozen french fries why does water come out of my tailpipe rosary ceremony at funeral how to get water out of your watch clap on one and three half asian blue eyes end of bed chair blue plastic bottle caps what does sl mean on a car couch at the end of the bed why are liquids incompressible hydrostatic lawn mower transmission how to remove paint from aluminum window frame there are no savage and civilised peoples; there are only different cultures. oil for paper shredder chewing food on one side of your mouth is there dna in poop in the vein of can mice chew through metal why does grass make you itchy i keep clenching my jaw furnace turns on then off window air conditioner wall sleeve what does raid do to insects why are brown cats rare