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HomeAircraftHelicopterMain Discussion › blade stop auto
03-08-2010 05:26 PM  8 years agoPost 1
rudyy

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E. Amherst, NY

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I am able to do a high altitude auto (over 200ft above), and I am very comfortable with it. Now, I really want to try the blade stop auto. What do I need to pay attention to for this maneuver? Also, does this maneuver have a high failure rate?

Rudy

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03-08-2010 05:33 PM  8 years agoPost 2
USNAviationjay

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Houston Tx USA

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if you attempt it make sure your blades are very tight in the grips so they dont fold on you.

and yes it is a high risk manuever.

for example CY just destroyed his Prototype Electric Rave 90 last weekend on a failed blade stop auto.

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03-08-2010 05:35 PM  8 years agoPost 3
rudyy

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E. Amherst, NY

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Let's say the blades never revive back, do I still have sufficient time to execute the backout plan i.e. disengage the throttle hold?

If CY cannot do it all the time, then it is indeed a high risk maneuver.

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03-08-2010 06:18 PM  8 years agoPost 4
TankDirt

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Illinois

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long story short, no, you wont have enough time and it wouild be quite the experience hitting TH when your blades are stopped..Either way your blades would likely fold from the force whether you tighten them or not.

Yeah, thats not the only video of him failing a blade stop either. They are very high-risk.

If you want to learn though, I suggest baby steps. Do a few flights of just autos, each time you hit TH slow the blades down alittle more than the last time before you give it negative pitch to complete it. This way you will get the feel for the heli at very low headspeeds.

Most people never pull off a *real* blade stop auto, they slow the blades down enough that you can see them individually then they give it negative and continue the auto..I suggest that over trying a real blade stop, they both look just as cool!

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03-08-2010 06:21 PM  8 years agoPost 5
dhc8guru

rrApprentice

Fort Worth, Texas

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The maneuver isn't worth the risk..unless your wealthy or sponsored.

I do them on the sim (perfect world) and even then I am only successful 75% of the time.

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03-08-2010 06:25 PM  8 years agoPost 6
Puffy929

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N W Ohio

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I did 5 yesterday. True bladestops. I always go out of idle up and then if I need to bail I am back in normal mode. Raise the throttle and the blades start spinning again. They are tight in the grips too.

TRex600Nitro YS 50 JR9303Converted to 2.4 TJ Pro

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03-08-2010 06:28 PM  8 years agoPost 7
westwindpilot

rrVeteran

Glendale, AZ

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I have done probably 10 blade stop autos. All were a success except for one. I didnt tighten my blades down enough and one of them came down and hit my boom. somehow I managed to get back into idle up and was able to land and the only problem was a dent in the boom. I was lucky!!!!!!!!!!!

Steve

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03-08-2010 06:31 PM  8 years agoPost 8
BarracudaHockey

rrMaster

Jacksonville FL

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Last two I saw in person (discounting IRCHA and Orlando when it was the likes of Bert and Nick) both ended in an explosion of parts raining down on the runway.

Andy
AMA 77227
http://www.jaxrc.com

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03-08-2010 11:28 PM  8 years agoPost 9
Jeff polisena

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westpalmbeachflorida usa

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to start learning them go high and while doing climb move mode switch to normal when high enough hit t hold and burn off blade speed after blade stop ease back on collective to start blades if you get into a pickle you can turn t hold off and heli will come on throttle to regain speed and stability . After doing this many times you will get comfortable and gradually no recovery from motor.

I stole it ,flew it and gave it back ;)

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03-09-2010 12:36 AM  8 years agoPost 10
Wingman77

rrProfessor

Pulaski Tennessee

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only attempt a blade stop auto if you are willing to rebuild your heli

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03-09-2010 12:40 AM  8 years agoPost 11
helicoop

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North West Ohio

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Puffy you forgot to mention you were doing it with a 600

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03-09-2010 04:08 AM  8 years agoPost 12
jake26

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central cali

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I was doing them the other week with my 700. Each time I did it a little slower until I found the point where they slow down to much . I just remember seeing my 700 falling and tumbling for what seemed like an eternity! The tail was bouncing up and down so hard I don't know how I didn't get a boom strike. luckily I pulled it out just in time with enough altitude left to get them going again without bailing out. I was lucky but it sure was awesome

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03-09-2010 04:17 AM  8 years agoPost 13
rbort

rrProfessor

Franklin, MA - USA

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I see a new product!
long story short, no, you wont have enough time and it wouild be quite the experience hitting TH when your blades are stopped..Either way your blades would likely fold from the force whether you tighten them or not.

Yeah, thats not the only video of him failing a blade stop either. They are very high-risk.
Someone needs to make a mini-BRS (ballistic recovery system) that you can fire off and deploy during a blade stop "gone bad".

Instead of releasing throttle hold you just hit another switch while hold in engaged (switch armed) and a small explosive fires off a mini parachute that floats your model to safety.

It may cost some money, but it will be more worth it than a rebuild!

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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03-09-2010 04:28 AM  8 years agoPost 14
GREYEAGLE

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Flat Land's

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OMG Who's gona be the Chuck Yeager
Ok Raja :

A3- 0 - squib, 9v batt, and 9g servo :

But How we gona get it to hang from the head ???? Without getting wadded up ???

Hey Riggley !!! Got any Beechum ???

greyeagle

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03-09-2010 04:34 AM  8 years agoPost 15
TankDirt

rrKey Veteran

Illinois

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It would need tiny wires and would have to sit in some kind of tube (to keep it from wearring and shorting out) and then run down the middle of the main shaft (on those particular models.) And on the top the servo and chute would have to sit on a modded head-button, which runs on a bearring and has a piece of piano wire also running through the mainshaft to keep it from spinning while the head does....the idea is simple enough, however getting it to work properly and effectivly while keeping weight down is a whole nother' story.

Get to work guys

EDIT, you would also need to mod the auto hub and mainshaft to have 2 screws, running parallel to each other on the edges of the mainshaft so that theres not a spinning screw in the middle of the mainshaft. Also need to do the same to the main hub on the top of the mainshaft.

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03-09-2010 04:49 AM  8 years agoPost 16
rbort

rrProfessor

Franklin, MA - USA

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Alot simpler than that
It will sit on the tailboom and fire backwards behind the tail rotor.

When the model is in freefall, all of Curtis's that I witnessed are nose down 45 degrees tumbling in a rolling fashion from inverted to upright to inverted to upright but with the tail staying up higher than the rest of the model.

If you use some sort of model rocket engine to launch the chute out of the tail, the model will hit nose first but at least the airspeed will be slow and maybe with only some canopy damage.

Trying to make something come out of the head is #1 cumbersome and #2 since the model tumbles there is a high rate of entanglement possible.

Straight back from the tail looks to me to be the best way to be successful.

The chute can be big enough to slow the model way down, and, if you're good you may be able to spool up again, pull to upright and drag the chute behind you for an airplane type approach and landing.

Curtis needs to DEMO this at IRCHA 2010!

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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03-09-2010 04:55 AM  8 years agoPost 17
TankDirt

rrKey Veteran

Illinois

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that was just my idea, would be neat to see somebody try..But that does sound more simple. But I would imagine something like that would break a rule of the AMA

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03-09-2010 04:58 AM  8 years agoPost 18
GREYEAGLE

rrElite Veteran

Flat Land's

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Easy
About 10 gm of HE wadded on the top bearing block in a ring should do it. Let the head auto down like a maple seed.

Heck I seen a Vid right here on RR of some guy practicing it while in a parking lot. From what I remember I think he was still flying the head as it went up, and as it came down. No damage to the HEli what so ever.

He's pretty famous

greyeagle

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03-09-2010 05:00 AM  8 years agoPost 19
RaptorMan23

rrKey Veteran

Sioux City, IA

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Heck I seen a Vid right here on RR of some guy practicing it while in a parking lot. From what I remember I think he was still flying the head as it went up, and as it came down. No damage to the HEli what so ever.

He's pretty famous

Watch at YouTube

If you only have to bend over once to pick it up it's a good landing.

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03-09-2010 05:11 AM  8 years agoPost 20
rbort

rrProfessor

Franklin, MA - USA

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I'm thinking like this
A tube that holds the chute, a charge to fire it, a mount designed to fit the horizontal tail clamp, a servo lead, and an arming switch with a test LED.

1. Place the arming switch to disarm and plug the servo lead to your receiver.
2. Screw the tube mount to the horizontal fin mounting screws with the tube laying over the tail boom.
3. Secure the tube in the rear with a tie wrap to the boom near the tail rotor mechanics.
4. Cut the tube excess length so it sticks out just past the tail rotor for no chance of chute rope entanglement.
5. Program the radio so that a switch will fire the chute testing it with the LED indicator on the tube while the arming switch is off.
6. When ready to try blade stop autos, arm the BRS system by turning the switch on - it is now TX ready to fire.

The chute will be inside the tube packed near the horizontal fin end. Once triggered, the charge will fire the chute out of the tube which will deploy it and the helicopter will decend slowly suspended from the tail boom.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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HomeAircraftHelicopterMain Discussion › blade stop auto
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