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[220.235.107.222]) by smtp.gmail.com with ESMTPSA id t125sm364092pfc.119.2021.10.19.17.38.11 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Oct 2021 17:38:12 -0700 (PDT) Content-Type: multipart/alternative; boundary="Apple-Mail=_240C3B32-BCCA-4230-8490-3665C4C005C9" Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.13\)) Subject: Re: [FlyRotary] Ag Ops Date: Wed, 20 Oct 2021 08:38:08 +0800 References: To: Rotary motors in aircraft In-Reply-To: Message-Id: <56DE5A5F-3C2E-4EC1-9247-5121434CB4C7@gmail.com> X-Mailer: Apple Mail (2.3654.120.0.1.13) --Apple-Mail=_240C3B32-BCCA-4230-8490-3665C4C005C9 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 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=E2=80=99d 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=E2=80=9D Airmasterto = for a 72=E2=80=9D MT prop. I only read after going with our gearbox/prop combination that Tracy = recommended only using the 2.85:1 with props of >=3D74=E2=80=9D 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=E2=80=9D 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=E2=80=9D prop at that = redline. Hope you have a great harvest and get back in the air soon Andrew. Steve > On 20 Oct 2021, at 7:52 am, Andrew Martin andrew@martinag.com.au = wrote: >=20 > 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. >=20 > 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 >=20 > On Tue, 19 Oct. 2021, 9:07 am Stephen Izett stephen.izett@gmail.com = , > wrote: > Good to hear your voice Andrew. > My son-in-law in Kojonup would be very interested in what you guys are = talking about. >=20 > Cheers >=20 > Steve Izett >=20 >> =20 >>=20 >>=20 >=20 > --=20 > Regards Andrew Martin Martin Ag --Apple-Mail=_240C3B32-BCCA-4230-8490-3665C4C005C9 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 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=E2=80=99d 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=E2=80=9D Airmasterto for a = 72=E2=80=9D MT prop.
I only read after going with = our gearbox/prop combination that Tracy recommended only using the = 2.85:1 with props of >=3D74=E2=80=9D
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=E2=80=9D 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=E2=80=9D prop at that = redline.

Hope = you have a great harvest and get back in the air soon Andrew.

Steve


On 20 = Oct 2021, at 7:52 am, Andrew Martin andrew@martinag.com.au <flyrotary@lancaironline.net> wrote:

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

On Tue, 19 Oct. 2021, 9:07 am Stephen Izett stephen.izett@gmail.com, <flyrotary@lancaironline.net> wrote:
Good to hear your voice Andrew.
My son-in-law = in Kojonup would be very interested in what you guys are talking = about.

Cheers

Steve Izett

 



--
Regards Andrew Martin Martin Ag

= --Apple-Mail=_240C3B32-BCCA-4230-8490-3665C4C005C9--