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Rotax 914 and Dynon comparability to calculate actual fuel u

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tonyrenshaw268(at)gmail.c
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Posted: Wed May 13, 2020 12:31 am Post subject: Rotax 914 and Dynon comparability to calculate actual fuel u

Gidday,

I am planning a fuel return line for a 914 powered aircraft and wondering what the fuel impeller in the return line of a Dynon setup looks like. I’m keen to know where I should locate a fuel return line reference the top of the foot wells on the firewall, how high I penetrate the return line through the firewall. If anyone has this combination I’d be keen to know where you have put your return line inducer? Thanks.

Regards

Tony Renshaw

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budyerly@msn.com

Joined: 05 Oct 2019
Posts: 288
Location: Florida USA

Posted: Fri May 15, 2020 1:57 pm Post subject: Re: Rotax 914 and Dynon comparability to calculate actual fu

Tony,



Since no one answered:

The Dynon normally uses the Red Cube FT60.  Follow the instructions on orientation and it gives few problems.  They are easy to clog if you allow bits of hose float around in your fuel lines so flush first before install.



I prefer to run my return along side my fuel supply line on the top of the cockpit module.  Then past the bulkhead (mud flap in the rear of the wheel well) then to a return red cube that is fastened so as to be as straight as possible, from the top to the return fitting on the tank.



On some aircraft, we put the red cubes together under the baggage bay.  The supply line is near the pump and the return is plumbed into the fuel drain line.  This puts both cubes together for maintenance and allows a single plug for wiring.  Try to keep the cube inlet and outlet as straight as possible and between the pump and engine on the supply.



See attached Drawing.  If it doesn't show, email me direct.



Best Regards,

Bud Yerly

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h&jeuropa

Joined: 07 Nov 2006
Posts: 645

Posted: Sun May 17, 2020 9:23 am Post subject: Re: Rotax 914 and Dynon comparability to calculate actual fu

Tony,



A couple of maintenance ideas.



We have FloScan transducers, not red cube.  A couple times there has apparently been some small debris caught in them resulting in unusual readings.  The guys at GRT gave us the tip to reverse the flow thru each one to clean it.  So ours are mounted on the stbd side footwell where we can easily get to them and switch the hoses to reverse the flow.  



We found that our FloScan transducers work more reliably when mounted to a solid surface, not suspended in a fuel line.



Finally, the pumps for a 914 have a small filter screen on the inlet.  You can carefully remove these and we do every year during inspection.  Often there is a little debris in there.  So plan your installation to make removing the pumps not too difficult.  But be careful, we haven't been able to find a place to purchase the screens if you destroy one.  You have to purchase the whole pump!



Jim & Heather

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