| Hi Andrew
Continuing to fine tune the Renesis cooling system and aircraft. Completing a new exhaust system after a leaking gasket warped a flange. Last flight temps max’d at 91C (196F) on takeoff with 20C (68F)OAT and we got her up to 189knots but only 2600 feet due to cloud. Learning that increasing the IAS by ~10knots in climb has a significant effect on cooling.
Also in the process of changing the current 66.5” Airmasterto for a 72” MT prop. I only read after going with our gearbox/prop combination that Tracy recommended only using the 2.85:1 with props of >=74” For those with expertise in this area, is it true that we should choose: 1. Largest prop dimeter with acceptable clearance 2. Target cruise tip speed of ~0.8-0.85 speed of sound for best efficiency If this is correct then with a 72” prop and a chosen engine redline of 7500 RPM (4 port Renesis) a better gearbox ratio would be ~2.5:1 The 2.85:1 would be better suited to a 74-76” prop at that redline.
Hope you have a great harvest and get back in the air soon Andrew.
Steve
Hi Steve, hows the Glasair going? I been away from flying for awhile, hopefully back into it in new year. Did start mine recently after it been sitting idle since feb 2020, So happy I persevered with the mazda, it started & ran so sweet I contemplated doing a couple of circuits but for the legalities. No MR and I need AFR first.
Neil, not sure I agree with your rotor setup proposal, ( not that mine is better) can get some weird aerodynamics with intermeshing rotors. Whole thing of nurse cart & drone need to be a package, rotors will never be stopped during refill so drone needs to land on roof of truck or trailer for refill from underneath to keep blades clear of dumbasses like me. Truth be told, I dont think we can get anywhere near the efficiency of a ground rig or Ag plane, we easily average 80 ha/hr each machine + nurse cart, going to need a swarm of drones to get near this. But could be a fun project. Andrew Good to hear your voice Andrew. My son-in-law in Kojonup would be very interested in what you guys are talking about.
Cheers
-- Regards
Andrew Martin
Martin Ag
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