From: " 12348ung@gmail.com" <flyrotary@lancaironline.net>
Received-SPF: pass
 receiver=logan.com; client-ip=209.85.216.44; envelope-from=12348ung@gmail.com
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
References: <list-362572@logan.com>
In-Reply-To: <list-362572@logan.com>
Subject: RE: [FlyRotary] Planetary re-drive?
Date: Sun, 17 Oct 2021 08:56:02 +1100
Message-ID: <005401d7c2d8$9de47ac0$d9ad7040$@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Thread-Index: AQIu3vtnWLElQf997STaiIqGz01+Yqsn6QvQ
Content-Language: en-us

Marc,
               I am the only one making redrives at all recently.  =
Currently teaming up with a partner who has access to all maching gear =
to make another version.  Why another version?  Well it appears that the =
ford planetries and g/box parts in the US are now superseded and =
difficult to source so the cost goes up.  In my search to find an =
alternative I am now to get a planetry from the GM automatics as there =
are thousands of them in OZ and naturally reasonably priced.  The ratio =
is approx. 3:1 which is ideal.
	Planetry sourced, the rest of the redrive is also undergoing a rethink =
as to cut cost.  Currently just the prop shaft cost $1000 if I take 10 =
at a time! Singularly the cost is $1500! Looking at getting one cast =
instead of CNC.  The housing cost me nearly $1200 for a very "pretty" =
CNC job, so again casting is much cheaper.  A standard planetry is =
mandatory, as to change the ratio again the cost is horrendous.  =
Whatever is closest to 3:1 will have to do.
Input shaft will have to be made as I prefer a sold unit over a "pinned" =
unit.  Again cost, but necessary.
Cushion drive is mainly cast and CNC to finish -- not difficult to set =
up for CNC and 10 of will not break the bank.
The mounting plate will be cast from Magnesium alloy rather than the 1/2 =
inch 6061 alloy plate.  Again cost, lightness and strength.

The end result? Cannot tell at this stage but without this progression, =
there will be no redrives available.  The experimental market is no =
reason the go into the cost of producing redrives, but the real demand =
looming is the Agricultural drone crop spraying market.  Here the need =
is for high power / weight engines (mazda) and therefore a redrive =
(affordable).  Much legislation involved, but under the experimental =
banner that all alters.  This market is huge if a drone that can lift up =
to 500 KG can be made.  Even 200 KG is marketable which is a single =
rotor mazda.  The "electric" charge cannot compete I feel with the power =
to weight of the Mazda. =20
	Looking at a twin rotor helicopter mazda powered.  Now that will get =
the natives talking!  Here in Oz a self propelled crop sprayer is way =
over $500,000.  Then it cannot spray on boggy ground.  Spot spraying is =
costly, and timing is critical, so drones will come as lifting capacity =
arrives.  CASA (aust) and the FAA have many regs regarding spraying =
chemical by air, but as demand increases the rules will be forced to =
change, I think.  Regardless the market is there which will benefit the =
experimental aviation sector.  Built on farm, used on farm, even if only =
to spray plant deficiencies and fungicide , the market is there.
	Hopefully it will all happen, but first a redrive.
Neil.

-----Original Message-----
From: Rotary motors in aircraft <flyrotary@lancaironline.net>=20
Sent: Friday, October 15, 2021 8:22 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Planetary re-drive?

Who is making a 13b fit 3:1 planetary now-a-days? That is since I =
can=E2=80=99t get a Mistral unit! Need for a 20b.=20
M

--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   =
http://mail.lancaironline.net:81/lists/flyrotary/List.html