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HelicopterMain Discussion › Anyone DS a helicopter 300 Mph helicopter???
01-25-2007 04:38 AM  10 years agoPost 1
ecoliburger

rrApprentice

NORCAL

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Anyone tried dynamic soaring with a helicopter.


http://www.geocities.com/soaringbythebay/dsoar.htm

I realize the aerodynamics are a lot different than a planker but I sill think it might be cool to try. Wonder what speed retreating blade stall would become a problem.
Maybe I will buy a cheap 30 and give it a try.

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01-25-2007 04:41 AM  10 years agoPost 2
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i bet if you put 710mm carbons on a 30/50 machine, took the engine out, and kept the c of g the same, you might get close

Shawn
Team Leisure-Tech
Team HelixRC

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01-25-2007 04:51 AM  10 years agoPost 3
ecoliburger

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Nah I am talking about keeping the engine just following the DS path to see how fast you can throw the heli around.

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01-25-2007 04:52 AM  10 years agoPost 4
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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ah, i thought you were thinking of slope soaring a heli, a never ending auto.

Shawn
Team Leisure-Tech
Team HelixRC

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01-25-2007 04:57 AM  10 years agoPost 5
ecoliburger

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Yea I have heard of guys taking the engine out of a light weight plastic heli and slope soaring. I am talking about all out flat ass speed

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01-25-2007 04:59 AM  10 years agoPost 6
Furious Predator

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Kitchener, Ontario, Canada

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hehehe, that would be interesting. strap a GPS to it so you can get your speed. i did that with my Vigor last summer. recorded a max speed of 100mph with a dive, 80mph without a dive, just a flat run.

Shawn
Team Leisure-Tech
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01-25-2007 05:16 AM  10 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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Amazing what you can find with a jog of the memory and a search engine.




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Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-25-2007 05:17 AM  10 years agoPost 8
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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thats sweet
i would love to try that.

Shawn
Team Leisure-Tech
Team HelixRC

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01-25-2007 05:24 AM  10 years agoPost 9
Dave Yost

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San Diego Ca, USA

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Hummmmm.....I wound if the rotor head would loose all of its head speed on the down wind leg under the boundry layer in the turn?

And what about controlability? would it be like a down wind auto?

Dave

MA Fury Extreme,Vibe 50, JR 9303,YS,Vblades, Don't blame me, I voted for Jimmy Buffet!

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01-25-2007 05:29 AM  10 years agoPost 10
Inspector Fuzz

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NLA

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I am guessing your speed limit would be dependant on the speed the retreating blade stalled at.
This is what ultimately limits a helicopters forward speed. At some point the retreating blade, the side going from front to back stalls because the forward speed of the heli is faster than the speed that the blade is moving. The blade stalls.
JEFF

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01-25-2007 05:31 AM  10 years agoPost 11
legoman67

rrElite Veteran

Nanoose Bay B.C, Canada

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umm were does he think hes going to land that?..lol

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01-25-2007 05:41 AM  10 years agoPost 12
dkshema

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Cedar Rapids, IA

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On the slope below him, but above the beach...

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Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-25-2007 05:42 AM  10 years agoPost 13
DMehalko(DM)

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Colorado

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that heli not have a tail rotor?

Century Radikal E640FBL

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01-25-2007 05:42 AM  10 years agoPost 14
Dave Yost

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San Diego Ca, USA

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Yea, understand RBS, but if you have ever seen DS, that turn down at the bottem of the hill is very sharp, like pylon one in R/C QM40 race. I am not sure the head speed would recover from a 20+g turn with no power? then be able to penetrate back up thought the boundry layer? My guess is that you would load the head up so much that it would bleed all of its energy. Not to mention a heli with out power has a lot of parasite drag.

Dave

MA Fury Extreme,Vibe 50, JR 9303,YS,Vblades, Don't blame me, I voted for Jimmy Buffet!

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01-25-2007 08:36 AM  10 years agoPost 15
Nightstalker

rrElite Veteran

UK (BEDFORDSHIRE)

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that heli not have a tail rotor?
don't need it as there is no torque

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01-25-2007 05:16 PM  10 years agoPost 16
mporlier

rrNovice

Montreal, Canada

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In Realfight G3.5 you can do it no problem. Kill the engine when in the air and enjoy.

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01-25-2007 11:45 PM  10 years agoPost 17
Dave Yost

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San Diego Ca, USA

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That must mean it works in real life then!

cheers Dave

MA Fury Extreme,Vibe 50, JR 9303,YS,Vblades, Don't blame me, I voted for Jimmy Buffet!

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01-26-2007 12:31 AM  10 years agoPost 18
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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In Realfight G3.5 you can do it no problem. Kill the engine when in the air and enjoy.
A watershed moment for me. I learned more about how a heli behaves when autorotating by slope soaring them on RFG3 than I did anywhere else. You can slope soar the Aurora for an hour + before it runs out of fuel from idling, and still land it on the stone parapet by that bench.

But unlike a glider, I'd bet that DS'ing a heli of any size would be borderline impossible unless the wind differential was exactly the right amount.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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01-26-2007 01:24 AM  10 years agoPost 19
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i tried it on Reflex. i had to cut the weight of the heli down to 1kg to keep it airborn, even then it was pretty tough.

Shawn
Team Leisure-Tech
Team HelixRC

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01-26-2007 01:25 AM  10 years agoPost 20
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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Couldn't you increase the uphill wind speed instead?

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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HelicopterMain Discussion › Anyone DS a helicopter 300 Mph helicopter???
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