AC5 M safety?

On Monday, January 20, 2014 3:52:54 PM UTC-8, Eric Greenwell wrote:
JJ Sinclair wrote, On 1/20/2014 6:33 AM:

I would be more concerned with the what the prop might do when it

comes off the engine...............tragic accident not long ago,

where the ship was seen in a hard left turn at about 500', then the

pilot tried to bailout, but was too low. Prop was found stick in the

left wing! JJ



Propellers have come off DG400 and PIK 20, so it's not specific to the

AC-5M. Who was pilot in the AC-5M accident you mentioned?



--

Eric Greenwell - Washington State, USA (change ".netto" to ".us" to

email me)

The fatal AC-5M accident I referred to happened on 19 May, 2012 at Kingston, NV. Preliminary accident report stated the prop was found imbedded in a wing, however the final report contains no such statement. The engine was displaced from its normal position and I suppose the prop may have been sticking into the left wing, but the finding was that no malfunctions were found in the airframe. Guess that's why preliminary reports are just that. The final report makes no attempt to explain what appears to be an uncontrollable turn or why the pilot attempted to bailout of a properly operating aircraft at very low altitude.
JJ

On Sunday, January 19, 2014 11:34:05 AM UTC-8, Nicholas L wrote:
Does anyone have any thoughts regarding the safety of the Russia AC5M self launcher?



The propeller is inches from the pilots head with the engine in the stowed position. How much of a hazard would this be in a hard landing or crash?



How safe is the cockpit? I dont much like the location of the fuel tank The 2.5 gallon fuel tank is directly behind the pilots head.



I haven't found much data on the AC5M so any info would be appreciated.



Nick

I don't think anyone can argue about the AK-47 - Throw it in the mud, drive over it with a jeep, chamber a round and it still throws lots of lead downrange. But one of the reasons it works so well is exactly because it is built with loose tolerance machining and metal stamping.

just for the record:

I built a kit version of the Russia AC4-C and found it to be a very delightful sailplane to fly and never has any doubts as to it's structural integrity.

The aircraft employed many clever design features and while a lightweight machine, seemed very capable for what it was designed to do.

Brad

N199RK

On Monday, January 20, 2014 10:27:22 PM UTC-7, Brad wrote:
just for the record:



I built a kit version of the Russia AC4-C and found it to be a very delightful sailplane to fly and never has any doubts as to it's structural integrity.



The aircraft employed many clever design features and while a lightweight machine, seemed very capable for what it was designed to do.



Brad



N199RK

The Collegiate Soaring Association has a Russia AC-4c based with the Penn
State Soaring Club. Many long flights have been accomplished in it. I have personally rigged it one-handed.

Frank Whiteley

On 21/01/2014 16:33, Frank Whiteley wrote:

The Collegiate Soaring Association has a Russia AC-4c based with the Penn
State Soaring Club. Many long flights have been accomplished in it. I have personally rigged it one-handed.

Frank Whiteley

Would that be one-handed or single-handed?

GC

On Tuesday, January 21, 2014 4:15:02 AM UTC-7, GC wrote:
On 21/01/2014 16:33, Frank Whiteley wrote:



The Collegiate Soaring Association has a Russia AC-4c based with the Penn

State Soaring Club. Many long flights have been accomplished in it. I have personally rigged it one-handed.



Frank Whiteley



Would that be one-handed or single-handed?



GC

Yeah I knew I'd flubbed that upon posting;^)

FW

AC5M broke up during flight testing for BGA CofA in the UK.

Pilot parachuted safely

AC5M didn't get BGA CofA

KN

At 19:34 19 January 2014, Nicholas L wrote:
Does anyone have any thoughts regarding the safety of the Russia AC5M
self
launcher?

The propeller is inches from the pilots head with the engine in the
stowed
position. How much of a hazard would this be in a hard landing or crash?

How safe is the cockpit? I dont much like the location of the fuel tank
The
2.5 gallon fuel tank is directly behind the pilots head.

I haven't found much data on the AC5M so any info would be appreciated.

Nick

On 01/21/2014 12:55 PM, Kevin Neave wrote:
AC5M broke up during flight testing for BGA CofA in the UK.

Interesting, is there a write up of the event? "broke up" is rather
broad...

Cheers,
Luke Szczepaniak

There's a known safety issue with AC5s, an aluminium propeller shaft should be replaced with a steel one. This have been discussed time and time again in the AC4 group. The replacement part can be ordered at the engine manufacturer. It takes a few minutes call to order a new shaft and an hour to replace it. If anyone is still flying with the aluminium propeller shaft, this is a stupid risk and one is just looking for trouble.

The BGA test pilot chose (rightly) to parachute out of the still flying
AC4 turbo (not self launching) after hearing a noise following the
'Vne' part of the test flight. Subsequently it was found to be an
airbrake issue that made the noise for which an AD was released
and additionally the VNE was lowered to 87 knots (if I remember
correctly). There was some discussion at the time that the ASI
might have been reading incorrectly due to the change of position
of the pitot for the turbo version? For what it's worth I am a huge
fan of the AC4 as a light weight soaring glider, not sure I would
personally be happy with one with a vibration creating engine
however, but many people have been very happy.

Chris


At 18:36 21 January 2014, Luke Szczepaniak wrote:
On 01/21/2014 12:55 PM, Kevin Neave wrote:
AC5M broke up during flight testing for BGA CofA in the UK.

Interesting, is there a write up of the event? "broke up" is rather
broad...

Cheers,
Luke Szczepaniak