ADVrider

Go Back   ADVrider > Fluff > Shiny things
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Rating: Thread Rating: 154 votes, 4.92 average. Display Modes
Old 04-13-2010, 06:53 AM   #4141
EvilGenius
1.5 Finger Discount
 
EvilGenius's Avatar
 
Joined: Apr 2007
Location: DFW, Texas
Oddometer: 20,319
Quote:
Originally Posted by Elvis70
Those big wings off load the rotor system and allow for more lift available for forward thrust and less dedicated to vertical lift. Or for a given speed less pitch, lower angle of attack, go faster before you hit retreating blade stall.

Wings make a big difference.
Wouldnt offloading the rotor be bad though?

I know it is with regular gyros.

Or do you mean offload as in taking power away from it but not taking the actual physical load off?
__________________
"Try turning that burn into torque. Then we're getting somewhere. Riding the potato to work seems quite impractical." - anotherguy

"Never bring a Nerf gun to a shovel fight." - My Brother
EvilGenius is offline   Reply With Quote
Old 04-13-2010, 07:20 AM   #4142
Elvis70
No speed traps in the sky
 
Elvis70's Avatar
 
Joined: May 2008
Location: Fayetteville, AR
Oddometer: 5,056
Offloading as in limiting the lifting duty so more lift can be focused on forward thrust.
__________________
I'll tape it to the handlebars, it's just logic George! If your hand is broken, you tape it to the bars! - Evil Knievel's reply to George Hamiliton's question, "How will you jump with a broken hand?".
Elvis70 is offline   Reply With Quote
Old 04-13-2010, 09:04 AM   #4143
EvilGenius
1.5 Finger Discount
 
EvilGenius's Avatar
 
Joined: Apr 2007
Location: DFW, Texas
Oddometer: 20,319
Quote:
Originally Posted by Elvis70
Offloading as in limiting the lifting duty so more lift can be focused on forward thrust.
Ah.
__________________
"Try turning that burn into torque. Then we're getting somewhere. Riding the potato to work seems quite impractical." - anotherguy

"Never bring a Nerf gun to a shovel fight." - My Brother
EvilGenius is offline   Reply With Quote
Old 04-13-2010, 01:02 PM   #4144
hgulledge
Adventurer-of-sorts
 
Joined: Apr 2002
Location: CenTex
Oddometer: 1,276
A riding buddy in Mexico asked me to go to Ireland and help him buy this beauty. I was translating from Irish to English for him. Very nice helicopter with only 700 total hours. I spent 38 years flying and this was my first helicopter ride.



__________________
HG
hgulledge is offline   Reply With Quote
Old 04-13-2010, 02:35 PM   #4145
BikePilot
Beastly Adventurer
 
BikePilot's Avatar
 
Joined: Jul 2005
Location: Tampa
Oddometer: 11,243
Quote:
Originally Posted by Elvis70
Offloading as in limiting the lifting duty so more lift can be focused on forward thrust.
You can also go faster on a single main rotor system if you can take some weight off the main rotor because less lift is needed, so you can push it faster before the retreating blade stalls.
__________________
'09 Buell XB12XT, TL1000S, H1F, M620, CR250R, KX100, XR650R, Cota 315R

Summer 2009 Ride Report http://advrider.com/forums/showthrea...1509c&t=507038
Summer 2008 RR. http://www.advrider.com/forums/showthread.php?t=367703
BikePilot is offline   Reply With Quote
Old 04-13-2010, 02:53 PM   #4146
EvilGenius
1.5 Finger Discount
 
EvilGenius's Avatar
 
Joined: Apr 2007
Location: DFW, Texas
Oddometer: 20,319
Quote:
Originally Posted by BikePilot
You can also go faster on a single main rotor system if you can take some weight off the main rotor because less lift is needed, so you can push it faster before the retreating blade stalls.
Couldn't you tilt the mainrotor back slightly and use the lift from that?

You might get a little drag, but Id think you'd be able to go faster before reaching RBS using that method too.
__________________
"Try turning that burn into torque. Then we're getting somewhere. Riding the potato to work seems quite impractical." - anotherguy

"Never bring a Nerf gun to a shovel fight." - My Brother
EvilGenius is offline   Reply With Quote
Old 04-13-2010, 03:45 PM   #4147
Elvis70
No speed traps in the sky
 
Elvis70's Avatar
 
Joined: May 2008
Location: Fayetteville, AR
Oddometer: 5,056
Quote:
Originally Posted by BikePilot
You can also go faster on a single main rotor system if you can take some weight off the main rotor because less lift is needed, so you can push it faster before the retreating blade stalls.
Believe that is what I said in this post.

http://www.advrider.com/forums/showp...postcount=4159
__________________
I'll tape it to the handlebars, it's just logic George! If your hand is broken, you tape it to the bars! - Evil Knievel's reply to George Hamiliton's question, "How will you jump with a broken hand?".
Elvis70 is offline   Reply With Quote
Old 04-13-2010, 03:46 PM   #4148
Elvis70
No speed traps in the sky
 
Elvis70's Avatar
 
Joined: May 2008
Location: Fayetteville, AR
Oddometer: 5,056
Quote:
Originally Posted by EvilGenius
Couldn't you tilt the mainrotor back slightly and use the lift from that?

You might get a little drag, but Id think you'd be able to go faster before reaching RBS using that method too.
Negative. Tilt it back and sure you gain lift, but you loose thrust. Just a simple vector equation.
__________________
I'll tape it to the handlebars, it's just logic George! If your hand is broken, you tape it to the bars! - Evil Knievel's reply to George Hamiliton's question, "How will you jump with a broken hand?".
Elvis70 is offline   Reply With Quote
Old 04-13-2010, 04:05 PM   #4149
EvilGenius
1.5 Finger Discount
 
EvilGenius's Avatar
 
Joined: Apr 2007
Location: DFW, Texas
Oddometer: 20,319
Quote:
Originally Posted by Elvis70
Negative. Tilt it back and sure you gain lift, but you loose thrust. Just a simple vector equation.
Thrust from what?
__________________
"Try turning that burn into torque. Then we're getting somewhere. Riding the potato to work seems quite impractical." - anotherguy

"Never bring a Nerf gun to a shovel fight." - My Brother
EvilGenius is offline   Reply With Quote
Old 04-14-2010, 07:37 PM   #4150
Elvis70
No speed traps in the sky
 
Elvis70's Avatar
 
Joined: May 2008
Location: Fayetteville, AR
Oddometer: 5,056
Main rotor. Thrust and Lift is the same force they just talk about them as if they are different so the fixed wingers can comprehend.
__________________
I'll tape it to the handlebars, it's just logic George! If your hand is broken, you tape it to the bars! - Evil Knievel's reply to George Hamiliton's question, "How will you jump with a broken hand?".
Elvis70 is offline   Reply With Quote
Old 04-14-2010, 07:46 PM   #4151
EvilGenius
1.5 Finger Discount
 
EvilGenius's Avatar
 
Joined: Apr 2007
Location: DFW, Texas
Oddometer: 20,319
Quote:
Originally Posted by Elvis70
Main rotor. Thrust and Lift is the same force they just talk about them as if they are different so the fixed wingers can comprehend.
I thought the whole point was to take power away from the main rotor anyways. That way you wouldn't waste thrust from the tail fan trying to counteract main rotor torque?
__________________
"Try turning that burn into torque. Then we're getting somewhere. Riding the potato to work seems quite impractical." - anotherguy

"Never bring a Nerf gun to a shovel fight." - My Brother
EvilGenius is offline   Reply With Quote
Old 04-14-2010, 07:58 PM   #4152
BikePilot
Beastly Adventurer
 
BikePilot's Avatar
 
Joined: Jul 2005
Location: Tampa
Oddometer: 11,243
Quote:
Originally Posted by Elvis70
Negative. Tilt it back and sure you gain lift, but you loose thrust. Just a simple vector equation.
I think he's talking about a compounded helicopter (is that the right term?) with a separate device to produce forward thrust (like the X49a pictured a few posts up).
__________________
'09 Buell XB12XT, TL1000S, H1F, M620, CR250R, KX100, XR650R, Cota 315R

Summer 2009 Ride Report http://advrider.com/forums/showthrea...1509c&t=507038
Summer 2008 RR. http://www.advrider.com/forums/showthread.php?t=367703
BikePilot is offline   Reply With Quote
Old 04-14-2010, 08:11 PM   #4153
Trixie
No, not that Trixie
 
Trixie's Avatar
 
Joined: Jul 2001
Location: Central MA
Oddometer: 3,484
While we're on this topic, I want eh setup Arnold flew in Sixth Day...



The rotors folded back to form a delta wing once the copter got up to speed. Turbojet propulsion from there.

Channeling Evilgenius :

WANT!

__________________
----------------------------------------------------
The world will not be destroyed by those who do evil, but by those who watch them without doing anything- Einstein

Trixie is offline   Reply With Quote
Old 04-14-2010, 08:57 PM   #4154
EvilGenius
1.5 Finger Discount
 
EvilGenius's Avatar
 
Joined: Apr 2007
Location: DFW, Texas
Oddometer: 20,319
Quote:
Originally Posted by Trixie
While we're on this topic, I want eh setup Arnold flew in Sixth Day...



The rotors folded back to form a delta wing once the copter got up to speed. Turbojet propulsion from there.

Channeling Evilgenius :

WANT!

GET OUT OF MY HEAD!!!!



















__________________
"Try turning that burn into torque. Then we're getting somewhere. Riding the potato to work seems quite impractical." - anotherguy

"Never bring a Nerf gun to a shovel fight." - My Brother
EvilGenius is offline   Reply With Quote
Old 04-14-2010, 09:02 PM   #4155
EvilGenius
1.5 Finger Discount
 
EvilGenius's Avatar
 
Joined: Apr 2007
Location: DFW, Texas
Oddometer: 20,319
Quote:
Originally Posted by BikePilot
I think he's talking about a compounded helicopter (is that the right term?) with a separate device to produce forward thrust (like the X49a pictured a few posts up).
I dunno what it's called, but I thought the whole idea was to get it up to speed, then transfer the power from the main rotor entirely to the rear fan to provide the forward thrust and use the lift from the already spinning main rotor to keep it in the air.

I dunno that it'd make it really any faster, but I'm betting it'd be a hell of a lot more efficient while in cruise.

__________________
"Try turning that burn into torque. Then we're getting somewhere. Riding the potato to work seems quite impractical." - anotherguy

"Never bring a Nerf gun to a shovel fight." - My Brother
EvilGenius is offline   Reply With Quote
Reply

Share

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 On
HTML code is On

Forum Jump


Times are GMT -7.   It's 04:53 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014