Rhino shuttingdown... Low Speed
08-29-2010 | 01:47 AM
#26
Joined: Jul 2007
Posts: 59
Likes: 0
Received 0 Likes
on
0 Posts
From: Destrehan, LA
RE: Rhino shuttingdown... Low Speed
I hope that clears it up for ya noab, but if it happens again-heres where I think my problem was.... In the fuel filter.. I just had one of my rabbits do the same thing. All the fuel lines were clear, no kinks, no air bubbles.... my fuel systems go from the main tanks T to a header tank then to the UAT. Safety on top of Safety. Aircraft had 22 flights prior to shutdown in flight.. ECU confirmed speed low 29000. I was just coming over the top of a loop, powered back to idle. I was at idle for about 2 or 3 seconds when it shutdown, about 2 to 3 minutes into the flight. Long story short, I opened up the metal filter with the yellow screen and it was 1/2 covered with either oil or what also looked like algie. I guess just enough restriction to slow the rpm down enough at idle to shut itself down. The million dollar question is....why did it wait 3 minutes into the flight instead of shutting down at idle while running on the ground?? All the while my fuel lines looked clear and never any air bubbles. If any of you guys have had trouble with algie I'd like to hear about it....
08-29-2010 | 06:53 AM
#27
My Feedback: (10)
Joined: Jan 2002
Posts: 1,109
Likes: 0
Received 0 Likes
on
0 Posts
From: North Port,
FL
RE: Rhino shuttingdown... Low Speed
Possible Algae issues:
Rich Miller has a recent and great thread on Algae here on RCU. Please check it out. The properties of algae are such it is heavier than say water contaminates which cause it to "fall to the bottom" until pressure or suction raises it up and into the mainstream fuel flow.
If you suspect algae as the issue within the fuel system. run the turbine on the ground at wot while at the same time watching the PW. If you note a constant continuing rise in PW during this test, this is the indicator something is restricting the flow.
Sincerely,
Eric
Rich Miller has a recent and great thread on Algae here on RCU. Please check it out. The properties of algae are such it is heavier than say water contaminates which cause it to "fall to the bottom" until pressure or suction raises it up and into the mainstream fuel flow.
If you suspect algae as the issue within the fuel system. run the turbine on the ground at wot while at the same time watching the PW. If you note a constant continuing rise in PW during this test, this is the indicator something is restricting the flow.
Sincerely,
Eric
08-29-2010 | 09:39 AM
#28
Thread Starter
My Feedback: (67)
RE: Rhino shuttingdown... Low Speed
Well, I have not had any issues since I replaced the RPM sensor. However, when it shut down on me on the ground, I would loose the rpm all together. Then after about 5 seconds it would come back.
I have many flights on the rhino since and so far all is well.
I have many flights on the rhino since and so far all is well.
08-29-2010 | 10:36 AM
#30
My Feedback: (44)
RE: Rhino shuttingdown... Low Speed
ORIGINAL: BluFox
Possible Algae issues:
Rich Miller has a recent and great thread on Algae here on RCU. Please check it out. The properties of algae are such it is heavier than say water contaminates which cause it to ''fall to the bottom'' until pressure or suction raises it up and into the mainstream fuel flow.
If you suspect algae as the issue within the fuel system. run the turbine on the ground at wot while at the same time watching the PW. If you note a constant continuing rise in PW during this test, this is the indicator something is restricting the flow.
Sincerely,
Eric
Possible Algae issues:
Rich Miller has a recent and great thread on Algae here on RCU. Please check it out. The properties of algae are such it is heavier than say water contaminates which cause it to ''fall to the bottom'' until pressure or suction raises it up and into the mainstream fuel flow.
If you suspect algae as the issue within the fuel system. run the turbine on the ground at wot while at the same time watching the PW. If you note a constant continuing rise in PW during this test, this is the indicator something is restricting the flow.
Sincerely,
Eric
Here is the link to that thread:
http://www.rcuniverse.com/forum/m_99..._1/key_/tm.htm
As Eric has mentioned, monitor your GSU on the ground and watch the Pump PW at WOT. What we found when there was Algae in the UAT was the RPM would go to full at first and then slowly deteriorate, the Pump PW would climb and rpm would drop. With this turbines ECU you could also menu down to another screen that displays the ECU battery voltage and the ECU current, as the pump PW was increasing naturally the ECU current was rising. This is the indication of a restriction in the fuel system.
08-29-2010 | 10:42 AM
#31
My Feedback: (44)
RE: Rhino shuttingdown... Low Speed
ORIGINAL: The Great Squintini
I hope that clears it up for ya noab, but if it happens again-heres where I think my problem was.... In the fuel filter.. I just had one of my rabbits do the same thing. All the fuel lines were clear, no kinks, no air bubbles.... my fuel systems go from the main tanks T to a header tank then to the UAT. Safety on top of Safety. Aircraft had 22 flights prior to shutdown in flight.. ECU confirmed speed low 29000. I was just coming over the top of a loop, powered back to idle. I was at idle for about 2 or 3 seconds when it shutdown, about 2 to 3 minutes into the flight. Long story short, I opened up the metal filter with the yellow screen and it was 1/2 covered with either oil or what also looked like algie. I guess just enough restriction to slow the rpm down enough at idle to shut itself down. The million dollar question is....why did it wait 3 minutes into the flight instead of shutting down at idle while running on the ground?? All the while my fuel lines looked clear and never any air bubbles. If any of you guys have had trouble with algie I'd like to hear about it....
I hope that clears it up for ya noab, but if it happens again-heres where I think my problem was.... In the fuel filter.. I just had one of my rabbits do the same thing. All the fuel lines were clear, no kinks, no air bubbles.... my fuel systems go from the main tanks T to a header tank then to the UAT. Safety on top of Safety. Aircraft had 22 flights prior to shutdown in flight.. ECU confirmed speed low 29000. I was just coming over the top of a loop, powered back to idle. I was at idle for about 2 or 3 seconds when it shutdown, about 2 to 3 minutes into the flight. Long story short, I opened up the metal filter with the yellow screen and it was 1/2 covered with either oil or what also looked like algie. I guess just enough restriction to slow the rpm down enough at idle to shut itself down. The million dollar question is....why did it wait 3 minutes into the flight instead of shutting down at idle while running on the ground?? All the while my fuel lines looked clear and never any air bubbles. If any of you guys have had trouble with algie I'd like to hear about it....
What happened in the case I was investigation was the main algae was in the UAT, it took 2 to 3 minutes to cover the UAT sock (BVM/Hansen type of UAT).
Note: some of the Algae did get through the sock and did clog up the fuel filter.
A complete dismantling and cleaning of the entire fuel system cured the problem, also the source (fuel jug) was totally emptied and cleaned.
