Home
Help
Calendar
Login
Register
New to this forum or RC hobby ? Start here : The RC India Gems !
Welcome Guest, please
login
or
register
.
Reputation
Add to Reputation:
What do you think of this post?
I agree
I disagree
Comment:
RC India
RC Equipments
Tools, Materials and Building Techniques
Topic:
What is ?, Why so ? and How to?
Pages: [
1
]
Go Down
0 Members and 1 Guest are viewing this topic.
Topic Tools
Topic Tools
Print
«
on:
December 24, 2009, 02:27:45 AM »
Rao
Plane Lover
Forum Veteran
Reputation Power: 5
Offline
City: Tadepalligudem
State: Andhra Pradesh
RC Skills: Beginner
Posts: 410
Join Date: Mar, 2009
What is ?, Why so ? and How to?
Tweet
How Flat Wing Foam Planes develop Lift without airfoil?
Logged
«
Reply #1 on:
December 24, 2009, 02:35:52 AM »
anwar
Administrator
Forum Hero
Reputation Power: 141
Offline
City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009
RC India - Flying and racing with open minds !
Re: What is ?, Why so ? and How to?
My answer attempt....
Some one I know had a pretty interesting analogy/explanation. "It is just a heli going sideways"
There is no "lift", just a prop keeping on carrying it forward, just like a paper plane floating in the air ONLY WHEN it is thrown with sufficient force and its shape (or angle of attack, rather) is conducive to such "skidding" through the air.
«
Last Edit: December 24, 2009, 10:16:04 AM by anwar
»
Logged
Hangar :
Please see
my introduction
.
RC India forum and me :
About this forum
.
«
Reply #2 on:
December 24, 2009, 06:16:16 AM »
allthatido
Plane Lover
Forum Hero
Reputation Power: 11
Offline
City: Mumbai
State: Maharashtra
RC Skills: Intermediate
Posts: 910
Join Date: Apr, 2009
Happy is a man whose hobby is his profession
Re: What is ?, Why so ? and How to?
just like any other airfoil...but then they are really inefficient ones and produce a lot of drag. That is why you see them mostly in foamies which are always over powered and fly on prop rather than on wings. you will never see it on a plane with thrust to weight ratio less than 1...or you'll not see the plane any longer in air.
(even a barn door can act like a airfoil when at an angle of attack...but it also produces a lot of drag)
«
Last Edit: December 24, 2009, 06:19:49 AM by ankurkaul17
»
Logged
www.allthatido.com
«
Reply #3 on:
December 25, 2009, 09:38:51 AM »
avijit17basu
Plane Lover
Senior Member
Reputation Power: 3
Offline
City: CHENNAI
State: Tamil Nadu
RC Skills: Beginner
Posts: 214
Join Date: Mar, 2009
Re: What is ?, Why so ? and How to?
How does a flat bottom trainer with dihedral fly inverted? The "LIFT' should push the plane downward. but by changing the angle of attack using the elevator, one does manage to fly it inverted.
Avijit
Logged
«
Reply #4 on:
December 26, 2009, 01:34:00 AM »
Rao
Plane Lover
Forum Veteran
Reputation Power: 5
Offline
City: Tadepalligudem
State: Andhra Pradesh
RC Skills: Beginner
Posts: 410
Join Date: Mar, 2009
Re: What is ?, Why so ? and How to?
I had seen a few non-coaxial helis without a tail rotor. How/Why is it possible ?
Logged
«
Reply #5 on:
December 26, 2009, 01:39:07 AM »
anwar
Administrator
Forum Hero
Reputation Power: 141
Offline
City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009
RC India - Flying and racing with open minds !
Re: What is ?, Why so ? and How to?
I haven't seen RC ones yet (didn't investigate yet), but I see full size helis all the time like that. The air-ambulance helis used in Qatar are these types, and have seen them up close when they land on highways here to pick up accident victims. Was quite intrigued initially by the lack of a tail rotor.
They way they work (I guess this is one of the multiple possible designs) is that they have a jet of air which is generated somewhere near the main engine itself, and this jet is pushed through a hollow tail boom. Finally a vertically placed control surface at the end of the tail moves to direct the exhaust of that jet of air, determining the tail movement.
«
Last Edit: December 26, 2009, 01:50:27 AM by anwar
»
Logged
Hangar :
Please see
my introduction
.
RC India forum and me :
About this forum
.
«
Reply #6 on:
December 26, 2009, 08:40:23 AM »
anwar
Administrator
Forum Hero
Reputation Power: 141
Offline
City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009
RC India - Flying and racing with open minds !
Re: What is ?, Why so ? and How to?
http://en.wikipedia.org/wiki/NOTAR
What Qatar uses seem to be the MD600N. One the contract pilots for the same used to fly RC helis with us, but left after completion of contract. He is still remembered in the field for the canopies of the Trex 450 helis which he himself used to paint with some kind of illuminated paint (it was bright orange with a black canopy area).... super visible even when these small helis are pretty far away.
«
Last Edit: December 27, 2009, 10:30:01 AM by anwar
»
Logged
Hangar :
Please see
my introduction
.
RC India forum and me :
About this forum
.
«
Reply #7 on:
December 26, 2009, 07:32:51 PM »
anwar
Administrator
Forum Hero
Reputation Power: 141
Offline
City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009
RC India - Flying and racing with open minds !
Re: What is ?, Why so ? and How to?
This video (already posted here before) talks about single rotor RC helis without any tail rotor.
I did not quite understand how they work (did not dig deep into them yet), but Kyosho used to make production models like these.
Logged
Hangar :
Please see
my introduction
.
RC India forum and me :
About this forum
.
«
Reply #8 on:
December 28, 2009, 04:26:48 AM »
Rao
Plane Lover
Forum Veteran
Reputation Power: 5
Offline
City: Tadepalligudem
State: Andhra Pradesh
RC Skills: Beginner
Posts: 410
Join Date: Mar, 2009
Re: What is ?, Why so ? and How to?
Is it really possible to perform, the extreme maneuvers expert RC Heli Flyers do, with real life full size Helicopters?
Logged
«
Reply #9 on:
December 28, 2009, 09:37:34 AM »
RotorZone
Forum Administrator
Forum Hero
Reputation Power: 8
Offline
City: Bangalore
State: Karnataka
RC Skills: Advanced
Posts: 607
Join Date: Mar, 2009
RotorZone.com
Re: What is ?, Why so ? and How to?
Not really, there are machine limitations and human limitations. The BO 105 is probably as exciting as it gets with real helis. Real helis are not built with the intention of flying inverted or with high piro rates. No real heli has enough negative pitch for holding inverted, at least in my knowledge.
I have seen a video where some one measured the g forces on an rc heli. It routinely exceeded 20G. A fighter pilot experiences maximum of 9G that too for a very short duration. This is generally considered the limit of endurance for a very fit human that too with the help of g suits. Most people will black out before that. And the piro rates like in a rc heli will make any pilot dizzy.
Logged
RotorZone
«
Reply #10 on:
December 28, 2009, 11:18:27 PM »
ankur
Scratch builder and diy'er
Plane Lover
Forum Hero
Reputation Power: 9
Offline
City: Allahabad
State: Uttar Pradesh
RC Skills: Beginner
Posts: 750
Join Date: Aug, 2009
I am Gr8
Re: What is ?, Why so ? and How to?
what i know about g forces is that any normal human[fighter pilots don't fall under this category as they are given necessary training to make it suitable] would only SAFELY withstand less than 5g force
force >5g is dangerous
also if u fly inverted in a real heli then wil be "sitting on the roof" so u may[if not properly pre-equipped ] fall down[rare chance] nut however u can put ur life to a serious risk.
source: info entertainment shows talking about g-forces/planes/helis etc
and my "weak" gk
Logged
Ankur Singh,
Aged 14-Studing in Class 10th
Pages: [
1
]
Go Up
RC India
RC Equipments
Tools, Materials and Building Techniques
Topic:
What is ?, Why so ? and How to?
« previous
next »
Jump to:
Please select a destination:
-----------------------------
General Topics
-----------------------------
=> Chatter Zone
=> Beginners Zone
=> RC Events
=> RC People
=> RC India Forum
-----------------------------
RC Models
-----------------------------
=> Electric Planes
=> Helis
=> Cars
=> Kites, Trains, Free Flight and All Others
-----------------------------
RC Equipments
-----------------------------
=> Tools, Materials and Building Techniques
=> Radios and Receivers
=> Electric Power
=> Fuel and Engines
=> Batteries and Chargers
=> Servos, Gyros and All Electronics
-----------------------------
RC Models
-----------------------------
=> Gas/Glow/Nitro Planes
-----------------------------
RC Baazar
-----------------------------
=> For Sale
=> Wanted
-----------------------------
General Topics
-----------------------------
=> RC Outlets and Resellers
-----------------------------
RC Baazar
-----------------------------
=> Free, Donations and Sweepstakes
=> Deals and Special Offers
-----------------------------
General Topics
-----------------------------
=> RC Locations and Clubs
=> RC Maneuvers and Skills
-----------------------------
RC Models
-----------------------------
=> Self-designed, DIY and College Projects
-----------------------------
General Topics
-----------------------------
=> RC General Topics
-----------------------------
RC Baazar
-----------------------------
===> For Sale - Completed
===> Wanted - Completed
-----------------------------
RC Models
-----------------------------
=> Boats
=> Multirotors
Loading...