On Aug 22, 2012, at 4:48 PM, "Ed
Anderson" <
eanderson@carolina.rr.com>
wrote:
> Chris, One thing to be checking
on your next take off is your
coolant/oil temps. As you know
take-off is the worst combination of
low cooling air mass flow and max
engine temperature due to WOT.
>
> You would be surprised how
quickly (with the additional power
you now have) you will exceed your
cooling limits if not careful. So I
would be certain to check the temps
at a frequent rate on your next
take-off until you know how the
system is going to react - hate to
see you cook your engine during your
first real Turbo climb out.
>
> I find for my Rv-6A that I
needed to get to 120 mph IAS as
quick as possible to get on the good
side of the cooling curve. So that
generally meant take off - get
safely above surround obstructions,
then level off/reduce climb until
airspeed hit 120. Then I could
resume climb with cooling gradually
bring the temps down as altitude and
airflow increased. Your sweet spot
airspeed would undoubtedly be
different given different platform
and cooling set up.
>
> Ed
>
>
--------------------------------------------------
> From: "Chris Barber" <
cbarber@texasattorney.net>
> Sent: Monday, August 20, 2012
9:17 PM
> To: "Rotary motors in aircraft"
<
flyrotary@lancaironline.net>
> Subject: [FlyRotary] Turbo
question.
>
>> As I have mentioned I have
had what I think are incongruent
readings regarding my manifold
pressure (mp)and engine rpm. It
seems I am getting quite low mp as I
add power to higher rpm.
>>
>> I am not well versed in
this area but my thought is that as
I add power, even with slight boost
(currently using a 3 lb spring in my
wastegate) eventually my mp should
raise a bit more.
>>
>> Today I did some static
test. I recorded engine RPM with the
turbo hooked up and recorded the mp
at 1000 rpm increments. Then I
removed the turbo plumbing from my
intake and recorded the same info My
results currently confuse me.
>>
>> With the turbo hooked up I
am getting
>>
>> RPM. MP inches
>> 2000 - 14.0
>> 3000 - 15.5
>> 4000 - 19.3
>> 5000 - 21.6
>> 5700 - 24.5 (topped out)
>>
>> With the turbo removed.
>>
>> 2000 - 15.8
>> 3000 - 15.3
>> 4000 - 19.7
>> 5000 - 24.8
>> 5833 - 29.8
>>
>> Is this indicative of
restriction in my plumbing? Perhaps
in the inter cooler? A dirty air
filter? A bad pop off valve or a
leak not allowing the air pressure
getting to the intake. Or????
>>
>> I am uncertain what other
permitters I need to check and
provide. I am just starting my
diagnosis in my Phase One testing. I
only have 1.6 hours in the air so
far. I value ya'll's direction and
input.
>>
>> Heck, perhaps this is
working properly but it just doesn't
seem right/comfortable.
>>
>> Thanks folks.
>>
>> Chris Barber
>> Houston
>> Velocity SE
>> Rotary 13b turbo (?) :-)
>>
>>
>>
>> Sent from my iPhone 4
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