Welcome, Guest.
Please login or register.
ETLB Squawk Forums    Building and Flying Related Boards    miniMax, Hi-Max, and AirBike General Discussions  ›  Nice 3 part series on a 2 stroke failure/teardown/ Moderators: Administrator Group
Users Browsing Forum
No Members and 9 Guests

Nice 3 part series on a 2 stroke failure/teardown/  This thread currently has 380 views. Print
1 Pages 1 Recommend Thread
LSaupe
April 2, 2019, 9:32am Report to Moderator
Flight Leader
Posts: 161
Time Online: 1 days 10 hours 40 minutes
Logged Offline
Private Message
aeronut
April 2, 2019, 12:40pm Report to Moderator

blue sky and tail winds to everyone
Ace
Posts: 1,560
Time Online: 28 days 22 hours 31 minutes
Very good series. Thanks for posting.


never surrender; never give-up
Logged Offline
Private Message Reply: 1 - 15
joe.scalet
April 2, 2019, 11:42pm Report to Moderator

Flight Leader
Posts: 155
Time Online: 2 days 1 hours 58 minutes
Interesting,  when the engine quit he still held full up elevator. Thanks for the post.
Logged Offline
Private Message Reply: 2 - 15
beragoobruce
April 3, 2019, 10:38am Report to Moderator
Built an Eros - now I'm flying it!
Ace
Posts: 1,067
Time Online: 19 days 10 hours 59 minutes
Some good info there. Hassle with water cooling was one reason I chose not to use the 582 engine.

I noticed he had the stick full aft all the way through the stall too. What was his instructor doing??
Logged Offline
Private Message Reply: 3 - 15
mullacharjak
April 3, 2019, 1:17pm Report to Moderator

Ace
Posts: 281
Time Online: 3 days 21 hours 12 minutes

  The aircraft was in a climbing Mush or Hanging (sitting) on the prop.

  A very bad moment for the engine to quit.

  The only good decision he made at that point was not relaxing the back pressure.


  KK
Logged Offline
Private Message Reply: 4 - 15
ITman496
April 3, 2019, 11:11pm Report to Moderator

Ace
Posts: 411
Time Online: 1 days 23 hours 31 minutes
As a person interested in flying a plane soon, that is interesting. Every single comment I saw was saying that the reason it totaled the plane was because he didn't push forward and drop the nose down to prevent a stall.  You are the first to say that it's a good thing he did just what he did.  Can you explain why?  It seems counter-intuitive.
Logged Offline
Private Message Reply: 5 - 15
The Termite
April 3, 2019, 11:56pm Report to Moderator
Ace
Posts: 588
Time Online: 5 days 3 hours 12 minutes
Quoted from ITman496
Every single comment I saw was saying that the reason it totaled the plane was because he didn't push forward and drop the nose down to prevent a stall.  


You are correct.

The plane was totaled because when the motor quit, the student pilot continued to hold the yoke  aft, and caused a stall. There should have been adequate altitude to land the plane after the engine failure, had the correct emergency procedure been used.  Apparently the instructor, sitting in the rear, could not overpower the student to get the nose down.

The Quicksilver GT 500 is unique in that it can be certificated as a primary category aircraft, and used for flight training. Or you can build and register it E-AB.

I initially saw these videos about a year ago.  I took Rainbow Aviation's 16hr  inspection course, and am on their email list.

Logged Offline
Private Message Reply: 6 - 15
ITman496
April 4, 2019, 12:59am Report to Moderator

Ace
Posts: 411
Time Online: 1 days 23 hours 31 minutes
Okay, I thought so..  I really want to make sure I don't make a mistake like that.  But I've never been put under that kind of pressure before. It's one thing to be a keyboard pilot and another to actually subject yourself to that. I hope when my moment comes, I keep my head on and react appropriately.
Logged Offline
Private Message Reply: 7 - 15
gyrojeffro
April 4, 2019, 3:24am Report to Moderator
Guest User
Here's how the experts do it!

https://m.youtube.com/watch?v=fTefUYrkQ-g
Logged
E-mail Reply: 8 - 15
Antoni
April 4, 2019, 8:21am Report to Moderator

'Max, Chaser and Quik fan
Ace
Posts: 228
Time Online: 2 days 2 hours 53 minutes
Quoted from The Termite

The plane was totaled because when the motor quit, the student pilot continued to hold the yoke  aft, and caused a stall. There should have been adequate altitude to land the plane after the engine failure, had the correct emergency procedure been used.  
....
Apparently the instructor, sitting in the rear, could not overpower the student to get the nose down


First, yet another concise and informative engineering youtube vid - thanks for the link!  This thumbs-up was just about worth this post.

What about the instructor? Even allowing for 'shock' after the arrival his words indicated that he did not understand what had just happened and kept saying so.  [edit - was it the instrucor or the student?]  Did the instructor try to make    any   control input?

I made a similar disastrous arrival but my engine was running well and at full power. No need to go into *boring* detail except that I remember being faced with two options: nose down or hold the nose up.

I held the nose up and got hurt. The Minimax was totalled.

If I'd let the nose down to gain airspeed when as low above the grass as I was there was a risk I could have nosed in, with a massive deceleration as the aircraft stopped. Instead I held back and trusted in the limited parachute effect to pancake it down and not go in like a dart. It was partly conscious (learned response) and partly instinct (bad response) but I am still here to say that the engine stripdown and analysis video was well worth watching.
Logged Offline
Private Message Reply: 9 - 15
PUFF
April 4, 2019, 11:29am Report to Moderator

Ace
Posts: 1,518
Time Online: 34 days 6 hours 18 minutes
quite a bit of difference in engine out at altitude and engine out while climbing.  I believe in a more gentle climb if I can just for this reason. Airspeed is KING.
Logged Offline
Private Message Reply: 10 - 15
mullacharjak
April 4, 2019, 5:54pm Report to Moderator

Ace
Posts: 281
Time Online: 3 days 21 hours 12 minutes
Quoted from ITman496
As a person interested in flying a plane soon, that is interesting. Every single comment I saw was saying that the reason it totaled the plane was because he didn't push forward and drop the nose down to prevent a stall.  You are the first to say that it's a good thing he did just what he did.  Can you explain why?  It seems counter-intuitive.


I was writing about the students action subsequent to the stall.
Response to a stall at 50 foot AGL is not the same as one at 500 foot AGL or rather should not be.The elevator can not be
used similiarly in the two situations because of the proximity to the ground in the former.
As for responding to an engine failure you have to know first what has happened.I am saying this because of the instructer
asking " What happened".
I apologize if I caused any confusion by my statement as stick forward is the correct response  to engine failure but keeping
an eye on the ground also.
PUFF has put it very well by saying to keeping your nose at a very shallow angle during INITIAL climb.

At altitude I am sure you can stand your max on its tail as your Kawasaki has a very healthy sound but I wont recommend
it as the max is restricted to 30 degree excursions in pitch!

KK

Logged Offline
Private Message Reply: 11 - 15
ITman496
April 4, 2019, 10:08pm Report to Moderator

Ace
Posts: 411
Time Online: 1 days 23 hours 31 minutes
Agreed. I think I'll make sure to take off with plenty of speed to spare and not just rip up like its an airshow and I'm flying an F22.

I do genuinely wonder what kind of climb performance I'll have.  We shall see! Glad you think it sounds healthy!

And good note on the pitch limit.  What are the roll limits?
Logged Offline
Private Message Reply: 12 - 15
aeronut
April 5, 2019, 7:33pm Report to Moderator

blue sky and tail winds to everyone
Ace
Posts: 1,560
Time Online: 28 days 22 hours 31 minutes
I think that maintaining about 60mph in all flight regimes is not a bad idea. These ultralights have very little inertia and slow down very quickly with loss of power. I have seen a lot of videos on u-tub lately that show max climb on take off and it is scary to see pilots showing of max angle of climb right after lift off. Betting your butt on Rotax or Hirth is not the swiftest idea. Some of the angles of climb produced by the engines being used today look to be so steep that an engine out would produce a situation that is unrecoverable ( just my 2 cents). It is fun to wow the spectators but at what expense?    


never surrender; never give-up
Logged Offline
Private Message Reply: 13 - 15
Max SSDR
April 5, 2019, 8:58pm Report to Moderator
If it flies, floats or fornicates.... rent it!
Flight Leader
Posts: 181
Time Online: 3 days 18 hours 44 minutes
Its generally accepted in very low mass aircraft that the climb angle at full power will be the same in reverse during an EFATO as a general rule. Add a second or so thinking time and there's not much time to sort anything out.

Despite the low altitude in the video, firstly you can hear the engine failing for 2 or 3 seconds so the instructor should have already been pushing. In my opinion there was sufficient height to gain some glide speed and to at least level out for landing rather than nosing in fully stalled.
Logged Offline
Private Message Reply: 14 - 15
PUFF
April 8, 2019, 11:43am Report to Moderator

Ace
Posts: 1,518
Time Online: 34 days 6 hours 18 minutes
Yeah, he should have reacted quicker.
Logged Offline
Private Message Reply: 15 - 15
1 Pages 1 Recommend Thread
Print

ETLB Squawk Forums    Building and Flying Related Boards    miniMax, Hi-Max, and AirBike General Discussions  ›  Nice 3 part series on a 2 stroke failure/teardown/

Thread Rating
There is currently no rating for this thread
 

Click here for The photo of the Moment