Convair Radial Crash at Wonderboom (10 July 2018)

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Richard Smit
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by Richard Smit » Mon Jul 30, 2018 7:06 am

This may be interesting:
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by jimdavis » Mon Jul 30, 2018 10:18 am

Very interesting stuff Richard. Thanks!

Does anyone know how they drive the variable speed supercharger? Is it infinitely variable - like a scooter? or does it simply have geared stages? And if so, how many stages? And how are they controlled?

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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by dany » Mon Jul 30, 2018 1:27 pm

More familiar on the M14P radial but from what I see in the workshop manuals on the R2800, the blower is either single speed or two speed,driven through planetary gears with a low and high selector. Seems there were various models,pending for what application. As I am also now interested in the mechanical side of affairs,will dig around to see what the test bench section says. I do not know what the selector arrangement is up in the cockpit.
Where is the radial mechanical

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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by jimdavis » Mon Jul 30, 2018 2:03 pm

Thanks Dany. :D

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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by shadow » Mon Jul 30, 2018 9:23 pm

Richard Smit wrote:
Mon Jul 30, 2018 7:06 am
This may be interesting:
Thanks Richard that's very interesting.
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by V5 - LEO » Mon Jul 30, 2018 9:54 pm

.......so one of these monster engines propelled the Corsair, no wonder it was such a monster.
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by Spoke Eagle » Thu Aug 02, 2018 3:24 pm

Does anyone know how the pilots are doing?

Break break, why use 1 magneto and two distributors?
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by Jasondn78 » Sun Aug 05, 2018 8:08 pm

Spoke Eagle wrote:
Thu Aug 02, 2018 3:24 pm
Does anyone know how the pilots are doing?
I was wondering the same thing. I read somewhere that they were both in an induced coma, but that was a day or so after the accident.
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by Old, Fat and Hairy » Sun Aug 05, 2018 8:40 pm

Richard Smit wrote:
Thu Jul 19, 2018 10:48 am
With the left hand engine producing partial, or even no (usable) thrust, (or feathered, which it wasn’t) and the right hand engine at METO, or more, this aircraft, even at a fairly heavy take-off weight, should have been easy to fly back around to the runway.

I say this from good experience in multi engine radial aircraft, including the DC-3, which has less SE performance than the Convair (or, that the Convair SHOULD have).

Something more was wrong with this aircraft, that relates very specifically to its performance.

Interesting to know where the mixture was set. The DC3 is not a happy bunny on one with auto lean.
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by happyskipper » Sun Aug 05, 2018 10:12 pm

Old, Fat and Hairy wrote:
Sun Aug 05, 2018 8:40 pm
Richard Smit wrote:
Thu Jul 19, 2018 10:48 am
With the left hand engine producing partial, or even no (usable) thrust, (or feathered, which it wasn’t) and the right hand engine at METO, or more, this aircraft, even at a fairly heavy take-off weight, should have been easy to fly back around to the runway.

I say this from good experience in multi engine radial aircraft, including the DC-3, which has less SE performance than the Convair (or, that the Convair SHOULD have).

Something more was wrong with this aircraft, that relates very specifically to its performance.

Interesting to know where the mixture was set. The DC3 is not a happy bunny on one with auto lean.
OFandH - is it on the Dak's QRH to select Auto-Rich on the good engine?
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by Speedbird57 » Wed Aug 08, 2018 10:22 am

Regards to the pilots, one has been brought out of induced coma, however he is in a natural coma now. The other is awake, yet not talking as yet. He is responsive though through facial expression. They may return to Australia as early as next week...
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by fcvanwyk » Wed Aug 08, 2018 3:55 pm

Thanks for the update Speedbird
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by GL » Wed Aug 08, 2018 10:00 pm

Speedbird57 wrote:
Wed Aug 08, 2018 10:22 am
Regards to the pilots, one has been brought out of induced coma, however he is in a natural coma now. The other is awake, yet not talking as yet. He is responsive though through facial expression. They may return to Australia as early as next week...
That sounds really bad. Do you have a prognosis?
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by Roo1valk » Sat Aug 11, 2018 2:47 pm

The preliminary report has been released - http://www.caa.co.za/Accidents%20and%20 ... ZS-BRV.pdf

Some notes:
The controller confirmed the presence of
the fire and stated that the “MAYDAY” call was made by the crew, however, they
did not state their emergency. This statement is evidenced by the cockpit GOPRO
recordings.
The crew filed a flight plan of FAWB-FAPN-FAWB and it was granted, however the
investigation revealed that the FAPN was closed for maintenance and landing of
fixed wing aircraft was prohibited.
2.14 After the e50kts call, the captain indicated that the left manifold pressure appeared
to be low.
2.15 The crew were informed of the left engine fire and the master caution light
illuminated, however the engine fire extinguishing system was not activated.
2.16 The emergency procedures were not followed after the crew were made aware
that number 1 engine caught fire.
2.17 The ATC reported that the aircraft reached 800ft but could not sustain its altitude,
and started losing height.
2.16 The Number one engine pressure manifold gauge was defective prior to the
accident (on the 26/02/2018 and 05/05/2018) and during take-off roll the pilot
reported that the manifold pressure was low
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Re: Convair Radial Crash at Wonderboom - 10 July 2018

Unread post by cage » Sat Aug 11, 2018 3:21 pm

This could get a little messy.
FO not rated on type, Captain only with local PPL validation.
"2.6 CRM found lacking".
LAME operating engine controls.
Improper procedure for managing engine fire.
Confusion with gear up or down.
First post maintenance flight, yet they take 17 pax with them.

Sounds like it started going wrong before they set off.
Some lawyers may be rubbing their hands together with enthusiasm.

Apart from some grammar and spelling mistakes it is a better quality prelim report.

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