Today's Message Index:
----------------------
1. 08:13 AM - Re: Re: Taxi Test (edward Clegg)
2. 08:46 AM - Re: Re: Taxi Test (Jim Gray)
Message 1
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Just wondering, Is that a new engine and if it is has it been run on a test
stand?
Ed Clegg
On Thu, Apr 29, 2010 at 8:50 PM, <Speedy11@aol.com> wrote:
> Taxi tests are fine so long as they are not high speed. The definition
> of high speed depends on the length of the runway. What Van is concerned
> about is guys doing a high speed test and inadvertently getting airborne on
> a flight they are not prepared for. His concern is well founded.
> However, if the test run is done on an 8000' runway, the danger diminishes
> greatly. One could actually get airborne and land again safely on that much
> runway. I'm not advocating taxi tests that are so fast as to get airborne.
> I believe 45 KIAS is more than enough for a taxi test. You will be able to
> get the nose to pitch up (or raise the tail) without the danger involved
> with an unplanned liftoff. And a long runway, even if done downwind, allows
> the airplane to slow in idle power without overuse of the brakes.
> I believe hot brakes on RVs occurs because the pilot (I did it)
> inadvertently rides the brakes during taxi and the wheel pant restricts air
> flow from cooling the brakes. A single taxi run is all that should be
> attempted on one day. Two runs in a short time are almost guaranteed to
> overheat the brakes.
> We takeoff and land into the wind due to limited runway lengths. If one
> had 3 miles of runway for an RV, then landing with or into the wind
> makes little difference. The only difference would be ground speed at
> touchdown which might cause a tiny bit of additional tire wear on downwind
> landings. However, in most cases, our runway lengths are limited thus
> dictating taking off and landing into the wind for safety.
> Stan Sutterfield
>
>
> I don't think that Van approves the "High Speed" Taxi. And I agree.
>
> Too many times when people have found themselves off the ground, totally
> unprepared.
>
> You also saw the power of TO's and Landings down wind. I don't think there
> is an airplane made today that allows more than a 10 knot tailwind.
>
>
> *
>
> *
>
>
Message 2
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My question exactly. My engine builder wanted me to PUSH my airplane
to the runway before the first flight, after a few very short test
runs, primarily looking for leaks. Prior to that, it was run on a
test stand for almost an hour, with sufficient cooling provided.
Jim Gray
N747JG RV-8 180 hours
On Apr 30, 2010, at 9:12 AM, edward Clegg wrote:
> Just wondering, Is that a new engine and if it is has it been run on
> a test stand?
> Ed Clegg
>
> On Thu, Apr 29, 2010 at 8:50 PM, <Speedy11@aol.com> wrote:
> Taxi tests are fine so long as they are not high speed. The
> definition of high speed depends on the length of the runway. What
> Van is concerned about is guys doing a high speed test and
> inadvertently getting airborne on a flight they are not prepared
> for. His concern is well founded.
> However, if the test run is done on an 8000' runway, the danger
> diminishes greatly. One could actually get airborne and land again
> safely on that much runway. I'm not advocating taxi tests that are
> so fast as to get airborne. I believe 45 KIAS is more than enough
> for a taxi test. You will be able to get the nose to pitch up (or
> raise the tail) without the danger involved with an unplanned
> liftoff. And a long runway, even if done downwind, allows the
> airplane to slow in idle power without overuse of the brakes.
> I believe hot brakes on RVs occurs because the pilot (I did it)
> inadvertently rides the brakes during taxi and the wheel pant
> restricts air flow from cooling the brakes. A single taxi run is
> all that should be attempted on one day. Two runs in a short time
> are almost guaranteed to overheat the brakes.
> We takeoff and land into the wind due to limited runway lengths. If
> one had 3 miles of runway for an RV, then landing with or into the
> wind makes little difference. The only difference would be ground
> speed at touchdown which might cause a tiny bit of additional tire
> wear on downwind landings. However, in most cases, our runway
> lengths are limited thus dictating taking off and landing into the
> wind for safety.
> Stan Sutterfield
>
> I don't think that Van approves the "High Speed" Taxi. And I agree.
>
> Too many times when people have found themselves off the ground,
> totally
> unprepared.
>
> You also saw the power of TO's and Landings down wind. I don't think
> there
> is an airplane made today that allows more than a 10 knot tailwind.
>
>
> et="_blank">http://www.matronics.com/Navigator?RV8-List
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
>
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