One engine out on takeoff...or How to repair a twin engine airplane   
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All Forums >> RC Airplanes >> Crash & Rebuild >> One engine out on takeoff...or How to repair a twin engine airplane
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One engine out on takeoff...or How to repair a twin eng... - 11/20/2009 1:30 AM   
reincarnate


 

Posts: 933
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From: Columbia City, IN, USA
Status: offline 		What happens when one engine (a before-hand completely reliable OS 46AX) flames out seconds after your 80" H9 B-25 rotates? It's easier to say what doesn't happen...flight. Rolled immediately left, giving me just enough time to throw the retracts up and throw full right rudder before it disappeared into...you guessed it... the corn.

Damage was actually minor, only one wheel had time to completely nest, so the nose and the left main ripped and broke their way out, sheeting and a few stringers busted throughout the fuse, and corn stalks embedded clear to the spars on both sides.

I decided to let it sit awaiting repair , since it was near fall anyway, and now, since I have two weeks off and it won't stop raining (check local listings) I decided to start the other day.

Fist pics show the wing damage, nacelles already stripped (saving for later!! )

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< Message edited by reincarnate -- 11/20/2009 1:53 AM >

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RE: One engine out on takeoff...or How to repair a twin... - 11/20/2009 1:36 AM   
reincarnate


 

Posts: 933
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From: Columbia City, IN, USA
Status: offline 		Next few pictures will just show the repairs in progress. I just read gboulton's great crash thread on his Wildhare Edge, and decided I'd leave the writing to him.

Maybe I can hire him to wordify my post. He verbulates better than I.

Starting with the right side repairs...

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RE: One engine out on takeoff...or How to repair a twin... - 11/20/2009 1:43 AM   
reincarnate


 

Posts: 933
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From: Columbia City, IN, USA
Status: offline 		...and then on to the left side. The left side, although a smaller repair, actually had more damage. The right side only had broken sheeting and leading edge to fix...all the ribs were intact. The left side had ribs broken completely out, and the top and bottom spars were broken.

Again, like an old fashioned silent movie...

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RE: One engine out on takeoff...or How to repair a twi... - 11/20/2009 1:51 AM   
reincarnate


 

Posts: 933
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From: Columbia City, IN, USA
Status: offline 		The wing is now finished and ready to be recovered. A stop at the LHS even revealed the correct colors ( you have no idea of the pure miracle there!) of Ultracoat.

All of this took less than 5 hours, spread over parts of two separate days, including a not-so-quiet stomping rampage and subsequent self banishment when a battery drill motor was knocked off the table (landing right on my big toe) by a curious shop kitten.

Up next...Nacelle and fuse repair.



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RE: One engine out on takeoff...or How to repair a twin... - 11/20/2009 7:24 AM   
foodstick



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From: ankeny, IA, USA
Status: online 		what little faith you have in your descriptions of the repair job are MORE than made up for with the repair work!

nice quick work! I hope its the last time it needs attention ! However you already know playing with twins is like grabbing a tiger by the tail !

Have fun with it !

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RE: One engine out on takeoff...or How to repair a twin... - 11/20/2009 10:31 PM   
fourstar40



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From: Ft. Wayne, IN, USA
Status: offline 		Well this kind of sucks doesn't it, boss? I assume you were flying from your personal flying field? It looks like the repair is going good. It will be up in no time. I have all the confidence in you.


How's work going?

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RE: One engine out on takeoff...or How to repair a twin... - 11/20/2009 11:08 PM   
bigmac399


 

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From: Venice Beach, CA, USA
Status: offline 		Repair looks great. Hey what stand is that? Did you make it?

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RE: One engine out on takeoff...or How to repair a twin... - 11/20/2009 11:37 PM   
reincarnate


 

Posts: 933
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From: Columbia City, IN, USA
Status: offline 		Yeah, I was flying at the house. Just decided that the big birds with retracts were better off at the home field. It's as smooth as a babies butt! This happened on about the third or fourth take off and landing of the day. Oldest daughter came out and needed some pics for her photography class and got some great ( ) action shots. You'll have to stop out sometime and fly. I'm open all winter, and I plow the driveway!!

I don't start the new job until after Thanksgiving. Then I'll let you know!



< Message edited by reincarnate -- 11/21/2009 12:14 AM >

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RE: One engine out on takeoff...or How to repair a twin... - 11/20/2009 11:41 PM   
Villa



Posts: 1466
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From: Wilson, NC,
Status: online 		When one engine goes out on a twin it is best to throttle back both engines, get control of the plane, then throttle up as careful as possible. Forget the retracts. Turning into the dead engine can be a disaster unless you do it very slow. Turning the other way at wide open throttle may not be possible. If you have been able to gain some altitude you may be able to throttle down some and turn away from the dead engine carefully, then throttle up slowly. Twins can be a ball if you take the time to study what is possible.

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RE: One engine out on takeoff...or How to repair a twin... - 11/21/2009 12:01 AM   
reincarnate


 

Posts: 933
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Joined: 10/1/2006
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From: Columbia City, IN, USA
Status: offline 		I built the stand. I got the idea from one that is (was, can't find it to link it to you) advertised here on the marketplace, and just drew it up from the pictures, and then made it sized to fit my applications. It is sized to fit from a .40 sized airplane to 50CC models (the biggest I fly-for now). I planned a mod in, when I drew it, to lengthen the arms and widen the base when I go bigger without cutting or rebuilding.

It works great. If the stand goes back on the marketplace, I wholeheartedly endorse buying one, unless you can design and build one yourself. I won't post any direct pics or dimensions for mine, out of respect to the designer of the original.

Thanks for the compliments.

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RE: One engine out on takeoff...or How to repair a twin... - 11/21/2009 12:12 AM   
reincarnate


 

Posts: 933
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From: Columbia City, IN, USA
Status: offline 		Yup, exactly the protocol to follow...provided that your not 10 foot off the ground 3 seconds after takeoff. This event was instantaneous, and basically amounted to a stall into the dead engine with zero aileron input. Too low, too quick, and in my opinion, completely unavoidable, at least for me. I was thrilled that the damage was so minimal.

I've lost an engine on this airplane 2 other times (smaller, cheaper engines that came with the ARF...those familiar with the plane know which one I mean) and brought it back in every time. That's why I had the OS engines on board. It will fly all day at half throttle, whereas the little Evo...whoops, I mean the other engines struggled at full throttle throughout the flight. Believe me, with the OS's I can do a very un-scale takeoff with full flaps...think Doolittle and carriers.

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RE: One engine out on takeoff...or How to repair a twin... - 11/21/2009 12:15 AM   
hILLVILLE



Posts: 159
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Joined: 10/28/2004
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From: Columbia City, IN, USA
Status: offline 		Pretty plane. Hope you get it back together. I think I would fly one of these as high as a glider and then just glide it in every time. I know a good glider pilot that could show you how it is done. Landingengines optional.

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RE: One engine out on takeoff...or How to repair a twin... - 2/24/2010 7:35 AM   
andrew66



Posts: 1041
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Joined: 1/6/2006
Last Login: 3/8/2010
From: Brandon, MB, CANADA
Status: offline 		man that just sucks. you did what we in the full scale world call VMCed it. it sucks, cause there is no real way to determine it in a model. obviously u did the right thing, cause its repairable. one thing about VMC (minimum control speed) is it is reduced with the gear down belive it or not. this phenomenon is called keel effect.
anyways, good luck with the rebuild

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