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
>> --
>> Homepage:
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>>
>>
>>
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www.avg.com>> Version: 2012.0.2197 / Virus
Database: 2437/5211 - Release Date: 08/20/12
>>
>
>
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