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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