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Safety - RC Helis are not toys > Crash in Colombia
 
 
wareagle
Heliman
Location: Crowley, TX

My Posts This: Topic  Forum

"I also believe the flaps did not help. I'm curious if the flaps were raised up once the aircraft was about 10' off the ground if that would have helped the issue at all."

This was a soft field take of technique. The use of flaps gets the plane off the ground in a shorter distance minimizing the stress on the gear. Once the plane is in the air, airspeed is then built up and a positive rate of climb is established prior to changing the flaps setting. If the pilot would have pulled the flaps at his airspeed, then the plane would have crashed sooner rather than later.

Several things are wrong in this accident. It takes more than one thing to cause a crash. First, the pilot didn't have sufficient airspeed to safely take off. No surprise there! Density altitude and aircraft weight play vital roles here! Second, the engine's power may have been below peak as well. In a high density altitude, the fuel mixture may have to be leaned some to get the best power, and my bet is this didn't happen. Third, there were too many people along the path of the take off role. I think that the pilot pulled the nose off too soon to avoid hitting someone. Fourth, the aircraft weight likely was too great for a safe flight. From the looks of the aircraft's flight path, the plane may have been a bit tail heavy, but I think it was within the CG limits of the aircraft. A tail heavy airplane will have a very high nose up atitude after take off with no chance of correction. A stall will take place shortly after.

As far as ground effect goes, this airplane never left ground effect. And as someone said, ground effect takes place anytime an aircraft's wings are generating lift close to the ground.

No matter what the final reason was, this was an unfortunate accident claiming several lives if the information is correct. The quick onset of the post crash fire leads me to believe that there were casulaties.
12-31-2008 05:12 PM
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Autography FlightPower . Advantage Hobby . Revolution Models

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Safety - RC Helis are not toys > Crash in Colombia
 
 
goldslinger
Heliman
Location: Garden City, KS

My Posts This: Topic  Forum
It looked like He only used 10 degrees flap, which is what You do in a Cessna on short field; either none or 10.

It looked hot so the density altitude was undoubtedly high.
A hot steamy day makes the aircraft perform as if at a higher altitude; and if You are say at a 6,000 ft. msl airport, and the density altitude is 4,000; you add the two up and You are only 1,000ft under the ceiling for that aircraft, so it only wants to climb off the ground as if it was already 10,000 ft msl; in other words, barely, if any. I'm not saying that happened, but it didn't help.

But reading that She was told to keep her feet off the rudder pedals (by an interpretor on You-Tube) It looks to Me that She was applying alot of right Rudder, and He was compensating by giving opposite Aileron; that induced what is called a 'slide slip' which Bush pilots use to get into tight areas in Alaska. It dirtys up the airfoil decreasing lift by Yawing the aircraft letting more of the air hit the side of the fuselage.

It's a great way to lose altitude fast, but You normally ease off the rudder when You are where You want to be altitude wise.

I think the hysterical passenger had a lot to do with it.

She should have been slapped and made to listen better to His instructions. I don't think She heard a word He said.
01-13-2009 05:30 AM
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Safety - RC Helis are not toys > Crash in Colombia
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