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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
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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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