Sign in to follow this  
Great Ozzie

The power of a 747's backwash!

Recommended Posts

Speaking of Mythbusters, did anyone see Wednesday's show on 11/14/07? They were able to find a cargo company that allowed them to use one of their 747's to test out the thrust wash of the engines at full takeoff thrust.WOW is all I can think of to say of the result! The guys pulled several vehicles across the rear path of a stationary 747 to see if the jetwash would blow them over. I was expecting some movement sideways of each vehicle, but not the steel ripping, flying, rolling and destruction of such heavy vehicles. The hoods were ripped off and both the car and the school bus rolled and went airborne! Geeeez!I guess that's a VERY good reason that vehicles are not allowed to drive on roadways that cross right behind the runway when large jet aircraft are taking off. I know there are many airports that have just that situation.Kim

Share this post


Link to post
Help AVSIM continue to serve you!
Please donate today!

Thats why you never fly too close to this bird.Dave F.

Share this post


Link to post

They did a similar one in the UK's 'Top Gear' program and one of the cars used was a 'De-Je-Veux' (Citreon 2CV).You should have seen that go! hahahaha

Share this post


Link to post

Yep, powerful lady. I was lucky enough to be on a 744 when the pilot didn't use reduced thrust for takeoff. We got pinned in our seats, she wasn't a full load per se, but still 350 pax and hand baggage, but only enough fuel to get us from LHR to Fairford and back, plus whatever reserve they needed. Man that takeoff from Fairford was a blast though. The takeoff from LHR was normal, and much different, you could still easily move in your seat, but coming home when the guy let her off the leash was really something else. Plus the climb out was much faster than normal also, we must have had a near 20 or 30 degree nose up attitude. WOW!!

Share this post


Link to post

The 747 that Mythbuster's used appeared to be a 747-200? model with older engines, not the high bypass engines that are on the 747-400 today. The newer engines do have more thrust, so I'm guessing that there would've been even MORE jet wash if they had used a newer 747.Still, it was an impressive demonstration. Both the car and the bus were flying through the air at one point. The Cessna that they tried out just flipped over and plastered itself to the ground.I wouldn't mind a ride in a lightly loaded 747 with full takeoff thrust applied! Yeee haaa! The 777 with those 2 BIG engines is no slouch in the thrust department either.:-boomKim

Share this post


Link to post

I watched that yesterday (they had a repeat on) it did look like a -200F because of the engines and the cockpit. I also think that it would have been so cool if they used a 777 or 747-400!

Share this post


Link to post

Even though it looked like a -200F cockpit, I noticed in the central console what looked like an FMC above the throttles. If that's the case, I wonder how it was integrated with the older A/P and A/T or if that system was upgraded as well?I've flown the RFP 747-200 in FS9, and it's a handful for one pilot, especially dealing with the FFRATS.Kim

Share this post


Link to post

Gotta be said though it's still a beauty of a plane.

Share this post


Link to post

That was an awesome episode! I have no idea how they got permission to do that and found a company to volunteer a plane.The results weren't surprising to anyone, but it was still fun to watch :)

Share this post


Link to post

>I watched that yesterday (they had a repeat on) it did look>like a -200F because of the engines and the cockpit. I also>think that it would have been so cool if they used a 777 or>747-400! >Here's the 747-400 on Top Gear ripping apart a 2CV.http://www.youtube.com/watch?v=CNPGVP0Uuj8-

Share this post


Link to post

Did you know that a 747 can't use full thrust with it's parking brakes on because the force of the thrust can potentially rip up the asphalt?James

Share this post


Link to post

Which begs the question, what thrust settings were they using for their demonstrations?Kim

Share this post


Link to post

Hmmmm. It looks like only the two inboard engines are running. I think that they were using all four engines in the Mythbusters segment, although I'm not sure since I don't remember any up close instrument shots when they powered up. I vaguely remember one shot of the pilots pushing all four thrust levers forward. I wonder how much they would have to reduce the thrust if all four engines were being used?Kim :-eek

Share this post


Link to post

I agree Chris...I had the fortuitous pleasure of seeing "Air Force One" (the Ronald wasn't on board at the time but am pretty sure it was a VC-25...) make a low approach to Rwy 28 at Purdue University (ok another war story :-S ). I was holding short of 23 in one of Purdue's PA-28s (Warrior II). The huge thing made a roaring pass maybe 50ft off the deck... then another Purdue training aircraft made a landing on 23 with what seems to be be normal separation. Then I remember seeing just as that Warrior was rolling out thru the intersection of 28/23 it "shaking" from side to side (and not a small amount either!)! The controllers saw it too cause one came on the freq and was like, "everyone stop! everyone taxiing hold your position!" and we sat there for several minutes atleast. Yes was ideal setup for max wake turbulence... low slow and heavy. You just don't realize sometimes until it's too late. Makes me wish I had tried to track down the student in that plane and see what it was like experiencing those vortices.Rob O.

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this