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ESM 50cc Corsair

Old 09-12-2014, 11:03 PM
  #2451  
kwik
 
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That is so sad, and on the second flight.



If you look at this picture, which is from my first Corsair, mine does not have that spar up front;



The design is simply not done by someone with the gray cells in place.

Probably done by someone who can operate some Software Package, but no clue about Isaac Newton.

I won't fly my second one again, until I have taken drastic steps on that center section.

The 50cc ESM Corsair looks stunning, simply, in my opinion. And that makes it just so much more sad, when it suddenly is just a broken eggshell, filled up with balsa pieces.
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Old 09-13-2014, 12:14 AM
  #2452  
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its a bad joke hey.
Old 09-13-2014, 05:36 AM
  #2453  
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Splatoman Brad, glad you still have the engine intact. That's a fine job of baffling the engine. Tell me, did you have your outer wings permanently attached or were they detachable for transport? I would think that by epoxying them into the main wing that the spar and entire wing would be much stronger.
Old 09-14-2014, 01:02 AM
  #2454  
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LBJ the photo of the engine was a before shot, the outer wing panels where removable but I had put another attachment point on each one. The brake in the wing was well inboard of the wing join.

If you have one of these wings it will brake, I have lost about $4000.00 in this aircraft and all of my time. This is the wing of my ESM Tigercat it happened on it fourth landing.
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Old 09-14-2014, 01:20 AM
  #2455  
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Sorry about the photos the son has my good camera when I get it back I will get some good ones.
Old 09-14-2014, 04:31 PM
  #2456  
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Originally Posted by splatoman
Hi I am the one that Peter was talking about. First the plane fly's very well and with the FG84 sounds so good. I spent about 12 months building the aircraft up and doing all of the scale bits on it I could not see any of the problems with the centre section. On the first test flight all was well came in did some adjustments and went up again that's when it happened. On inspection of the centre section we found that the fiberglass was a very dry lay up and that a lot of the ribs were not glued to the skin. The spare was not up to the job at all it would have been at home on a 40" model not on a 85" one. After this and m ESM Tigercat I don't think that I will buy any more.



Brad,that's crap mate, all
that time and money invested simply due to shoddy design on ESM part. Main spar is definitely not up to the job and look at how much meat is removed from those ribs. There is a tiny amount around 8mm that splits and lets go. Anty weight reduction measures should be circular to dispribute the load but have enough meat left !!!

Same thing you had with the centre section of your Tigercat.

If you were to get one you would have to cut the centre section open and pull the skin off so it could be beefed up. But what about the outer panels? Where do you stop? Brad I'd be going back to Austars about this. Nopt fit for purpose comes to mind. Richard had some problem with one of his and get satisfaction from them. Ask the question.

cheers

me
Old 09-14-2014, 08:45 PM
  #2457  
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Hey Kwik,
Your photo shows no cross ribbing or bracing behind the cooler thingy. Did you remove it...mine has some bracing about 1 inch behind the cooler thingy that goes between the ribs.

jim

Originally Posted by kwik
That is so sad, and on the second flight.



If you look at this picture, which is from my first Corsair, mine does not have that spar up front;



The design is simply not done by someone with the gray cells in place.

Probably done by someone who can operate some Software Package, but no clue about Isaac Newton.

I won't fly my second one again, until I have taken drastic steps on that center section.

The 50cc ESM Corsair looks stunning, simply, in my opinion. And that makes it just so much more sad, when it suddenly is just a broken eggshell, filled up with balsa pieces.
Old 09-14-2014, 09:15 PM
  #2458  
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Originally Posted by jimkron
Hey Kwik,
Your photo shows no cross ribbing or bracing behind the cooler thingy. Did you remove it...mine has some bracing about 1 inch behind the cooler thingy that goes between the ribs.

jim
Exactly..... That was the whole point with the post ...... I havent removed anything on that picture.

Remember that there are at least two designs; One with wing tubes, and one with wood-sleeves. Mine has wing tubes, and is therefore very strong up until where the tubes ends......

Had there been "longerons" on top and bottom, safely connected to the tube area....with full main spar in between......

Instead it seems they believe that the very thin composite can act as a "stressed skin" contstruction just as on real airplanes.......with a skin made of aluminum, riveted to longerons....

In all fairness; In my case it lost the wing after 75 flights, a deadstick landing in the field, and myself cutting it open, trying to fix a growing crack...then didnt sand the G-10 before gluing.......

Last edited by kwik; 09-14-2014 at 09:25 PM.
Old 09-15-2014, 12:10 AM
  #2459  
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G´day all, I picked up one of these a few weeks back, it is the version with the wing tubes, have only just made a start on it, so after reading this forum, I have cut the top of the skin on the centre section, plan is to put another layer of glass on the bottom skin, plus put a ply skin over the spar, both sides. Any other suggestions will be appreciated.
Oldtimer.
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Old 09-15-2014, 12:15 AM
  #2460  
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Did the skin come off real easy? Mine did.
I'll take some pics of what Ive done so far.

Matt
Old 09-15-2014, 12:28 AM
  #2461  
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These are b4 pics, from the bottom. terrible really.
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Old 09-15-2014, 12:36 AM
  #2462  
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These are prt way thru the fix.
I've made doublers with 6mm ply on the main "spar" Also made a new spar fwd of the main. Applied carbon fibre to the top skin and made carbon fillets with cf rovings. Primarily used Hysol for the ply wood bondings and gap filling.
I run outta Hysol, so I have stopped till my order arrives from DA in Brissy. Then I will apply hysol to the front spar wing skin. Once cured I will attatch the bottom skin with hysol, once cured I'm gonna fill the front voids with expanding foam. I forgot to say I will also make some doublers for all the ribs I can get to.
These pics are the job about half done. Already it has made a marked difference.
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Old 09-15-2014, 02:09 AM
  #2463  
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Hi here are some better photos of mine finely got my good camera back.

I think I will go back to flying what I build.
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Old 09-15-2014, 08:36 AM
  #2464  
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Cosmo, that looks like a good way to approach the "problem".
Old 09-15-2014, 02:44 PM
  #2465  
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G´day all,
the skin did come off surprisingly easy, I dont know what the substance is they use, it seems to be more of a ¨something to hold bits in place¨ than a glue, I could break bits of the glue off in chunks.
a few have had a problem with the centre section, Kwik said his had been given some pretty hard treatment before it let go, it still isnt too bad, after all, how many of these are out there flying well, ESM must have made quite a few, even cars have a lemon every so often,
I have the skin off, I will beef it up a bit, plan on putting the air tanks in while I have it open,
Oldtimer
Old 09-15-2014, 07:04 PM
  #2466  
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looks like bloody hot glue. Rubbish!!

ESM should be ashamed of themselves. Hate to think wjhat inside the fuz and outer wing panels look like . . . .


cosmo that looks like a decent fix though id have made the spar double and sub spar all from one piece with grain running length ways.

perhaps carbon fibre mat along the spars and rigid CF tape along the top of the spar all in one piece.
Old 09-15-2014, 07:10 PM
  #2467  
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Brad,

out of curiosity how about opening up an outer wing panel and taking some photos?

cheers
me
Old 09-16-2014, 05:55 AM
  #2468  
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Matt,
How do you plan on closing those big holes? Foam the bays? Balsa sheeting? Then glass?

jim
Originally Posted by cosmo21
These are b4 pics, from the bottom. terrible really.
Old 09-29-2014, 11:16 AM
  #2469  
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We had our club big bird meet on Sat Sept 27. Wasn't a huge crowd, but we had at least 6 warbirds flying. Got mine flown and Glen Baker was there to click a few pics.He's a really good photog and always gets some great shots.




Here's Mr Potato Head with the F4U.




Coming in for landing! Full Flaps down.


Almost on the runway.


On the ramp after a great flight.
Old 09-30-2014, 01:20 AM
  #2470  
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Originally Posted by Peter_OZ
looks like bloody hot glue. Rubbish!!

ESM should be ashamed of themselves. Hate to think wjhat inside the fuz and outer wing panels look like . . . .


cosmo that looks like a decent fix though id have made the spar double and sub spar all from one piece with grain running length ways.

perhaps carbon fibre mat along the spars and rigid CF tape along the top of the spar all in one piece.
I tried to make the spar doubler and sub spar all one piece, I couldn't make it happen. The new spars are well tied in tho, and the grain is running length ways for maximum strength.
All tied in to the top skin with the carbon cloth and a thick slurry made outta the poly resin and carbon towings. Hysol also used thru out. and the ribs have also been doubled and tied into the skin. I also made an epoxy/carbon slurry and filled the critical areas on the original spar.

I really don't know what else I can do, apart from build it from scratch.
Old 09-30-2014, 01:22 AM
  #2471  
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Originally Posted by jimkron
Matt,
How do you plan on closing those big holes? Foam the bays? Balsa sheeting? Then glass?

jim
I have made spar doublers and a sub spar outta 6mm ply, and rib doublers for the ribs. Plus lots of cf, hysol ect ect.
Old 09-30-2014, 01:25 AM
  #2472  
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Mate that's a beautiful Aircraft,
On one of the pics the center wing looks wavy, like the skin is not bonded, as discussed. Tell me it aint so.

Matt
Old 09-30-2014, 03:21 AM
  #2473  
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LBJ love your aircraft but as Matt said that wing does not look good it looks like mine just before the wing let go. The ESM Corseair is lovely to fly and great to land it is just a shame about the buid of them.
Old 09-30-2014, 04:35 AM
  #2474  
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Thanks, Cosmo, Splatoman, the center wing section gets a bit wavy in the sun, but so does my 74" ESM Corsair. So far, they are both holding their own against the forces of nature and laws of physics. Ha. I keep them covered with a bedsheet or under the tables of the pitts area when not flying, at least in the really hottest part of Summer. Spring and Fall aren't too bad. But, like all warbirds, the next flight may be the last flight! ha. Sometimes they just go away.

Got another photo by Nancy Abby from the Big Bird meet. Little different angle of dangle on the wings.


Last edited by LBJ; 10-02-2014 at 07:51 PM.
Old 10-05-2014, 10:09 PM
  #2475  
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G´day all,
have been doing a bit on the centre section, I made up a false spar, 3mm aircraft grade ply, had to do it in 2 pieces, I doubled up the centre join, I glued them in with some thickened West System Epoxy, then bits of Fibre Glass matt around the edges, clamped it all together, looks rough, but I dont think it will fall apart, then I put a layer of Glass on the inside of the skin, wherever I could get to, the glass isnt an exact fit, the idea was just to strengthen what I could get to. next is to wet the inside of the spar then stuff more glass into the gap.

cheers, Oldtimer.
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