|
|
Hi Time
First, congratulations on lift- off. A great aircraft the RV-10, I fly an RV-6A.
Your flight sounds exactly like mine back 13 years ago.
Took off with airspeed increasing, altitude increasing, rpm increasing and oil/coolant temps beating them all. I was a max oil temp (245F) and coolant was over 220F.
I only climbed to 800 ft and bent back around the pattern as I had intended to made 5 circuits and then land. I leveled off and pulled back the power thinking that with less power and more airflow - that the temps would come down a bit. NaDa. Still maxed out.
So rather I decided not to make a full circuit and decided to land as I came abeam the end of the runway. Pulled flap handle - Stuck! NO Flaps!(another story) But, a 5500 ft runway was a blessing, make a beautiful no-flap landing (amazing what concentration does).
The problem (in my case) was insufficient airflow to the oil cooler. I am embarrassed a bit to admit it now, but I only had a 2 1/4" dia hose running to one corner of a box of a square plenum (no curves to smooth airflow) around the coil cooler mounted within 10" of firewall. I eventually opened up the hose to a 5" dia hose with a snorkel sticking out from the cowl. That make it barely flyable on a cool day but was no solution.
I bit the bullet, got an Rx7 oil cooler ( I was using an Earls Cooler at the time) and stuck it up under the PSRU - provided a 22 1/2" wide and 2 1/2" high opening underneath the prop spinner with a duct feeding all the air right into the oil cooler. First flight with the new set up and the oil temp dropped 35F !, this took some of the heat load off the radiators and the coolant temp came right down as well.
So my first suggestion is take a good look at you airflow (in and out). Attached is photo of my set up.
Also are you using a thermostat??
Best Regards
Ed
Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com
--------------------------------------------------
From: "Chris Barber" <cbarber@texasattorney.net>
Sent: Wednesday, April 25, 2012 11:38 AM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: N774CG, RV-10 20B first flight
Tim,
I have no suggestions as this is exactly what concerns me when I attempt first flight as I got my Airworthiness certificate yesterday. I will be very attentive to the responses you get.
Chris Barber
Houston
________________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Tiffanie Holt [coastiefamily4@gmail.com]
Sent: Wednesday, April 25, 2012 10:16 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] N774CG, RV-10 20B first flight
Well, got up this morning and did the first flight on the RV-10. OAT
55 Degrees at 7000 ft. Did the taxi to the runway and the water temp
was 168 and oil was 150. Everything looked full power in and off we
went. She has plenty of power, RPM was 7000, and here comes the
temps. I immediatelly turn to down wind at 80kts and the water temp
came up to 220 and oil at 200. Turned base and temps still climbing
still at 80 kts, turned attention to land vise temps. I landed
immediately and taxied back to the hangar and the temps peaked at 245
water and 240 oil. She got hot, I got boil over once I shut the
engine down. I took all the cowls off to help the cooling of the
engine. Check everything over, turned the prop and listened for any
unusual noise, checked the oil and could smell the 2 stroke oil in it,
which I understand is normal.
She Flew, but not what I expected on temps. These are the highest
temps that I have seen so far. I had 11 hours on ground runs, but I
did not let water temps get above 205 and oil temp normally stayed at
180.
At the hangar, I let the temps get to 180 on water and 160 on oil, I
filled the expansion tank back up and ensure there was coolant and
started her back up to see if I had normal readings. Oil pressure was
on the rise, oil temp was at 175 and water temp stabilized at 190,
Just wanted to ensure I did not do damage to the engine and that she
would start. She was a little hard to start, but started purring like
a kitten again. Shut her down, and then started her back up and she
immediately turn over.
Did not run her much longer, had to shut her down and get to work.
Are there any suggestions or inspections that I will need to do on the
engine for the high temps?
Things I plan to do before next run:
1. Oil Change, Filter Clean: It is time for a cleaning and I can
inspect the oil.
2. Flush the radiator: Ensure everything looks normal
3. The highest point in my water system is the expansion tank, but the
water return is at a level slightly below the expansion tank. I plan
to install a fill/bleed valve in it to ensure all the air is out of
the system.
4. Move the Water Temp Sensor from the block to the return line to the radiator
5. Place the Louvers in the cowling. I did put the louvers in per
Van's Plans, but I put then in the cowl to help pull the heat from the
exhaust system.
6. I will also open up the inlet to the Radiator as well. The
standard Sam James Cowl has a 4 3/4 inch Diameter opening, I will open
it up more and give it at try.
Any suggestions would be greatly appreciated.
Tim
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
|
|