On 7 May 2022, at 02:07, Michael Coates <mcoates@...> wrote:

? STOL and Jabiru just dont go together as it takes to long to wind up the power...? If you want STOL then you need to go Rotax, the difference is substantial running through the gearbox

Justin Gregoris wrote on 6/05/2022 11:31 pm:

I have been trying for the life of me find a tacho sending unit and how to wire it up. The reason i want to add an additional analog gauge inside the cabin is because very now and then i dont trust me digital computer unit that gives me the RPM reading. I want to install a 2.5 inch diameter gauge to see if there is any difference from digital to analog read-outs.

does anyone who where i can purchase the tacho sender unit; make and model and size/length of thread and diameter of sender unit?

I am assuming the additional sending unit I am looking for has 2 wires coming from it - one wire that will connect to any positive 12v wire, while the other wire gets fixed/grounded to a negative terminal or ground? or does the other wire get attached to some other part of a circuit?

I tried to look on Amazon but i can only find big tacho sending units; for example, they are 1/2 inch diameter and 3 inches long - way too big.

My ground adjustable Sensenich propeller is super sensitive anytime I try and adjust the pitch of the blades, the RPM's (during a static run-up test thereafter) seems to move +/- 200-300 RPM difference - then on top of all that, my static test run-up will (for example) indicate a max RPM reading of 3200RPMs, but then when/once I apply full power during real-time takeoff, the RPMs give me a different reading (usually another 100-300RPM) higher than my static ground test. Lastly, the RPM readings seems to change while I am either flying by myself or when a 210lb passenger is flying with me.

My goal is to have max 3300RPM, for finer pitch setting; ultimately yiedling faster climb-out. I am not looking for faster top speed but rather STOL capabilities on grass airstrip my X Air is based out of.

Any guidance regarding the above make/model and installation is greatly appreciated.

Thank you kindly,

Justin?

-- 
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