Return-Path: Received: from misav08.sasknet.sk.ca ([142.165.20.172] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 884279 for flyrotary@lancaironline.net; Wed, 20 Apr 2005 01:40:26 -0400 Received-SPF: none receiver=logan.com; client-ip=142.165.20.172; envelope-from=hjjohnson@sasktel.net Received: from thyme.sasktel.net ([142.165.20.198]) by misav08 with InterScan Messaging Security Suite; Tue, 19 Apr 2005 23:39:37 -0600 Received: from jarretpb17surw (hsdbwb142-165-118-52.sasknet.sk.ca [142.165.118.52]) by thyme.sasktel.net (SaskTel eMessaging Service) with ESMTPA id <0IF800ILFD206Y@thyme.sasktel.net> for flyrotary@lancaironline.net; Tue, 19 Apr 2005 23:39:37 -0600 (CST) Date: Tue, 19 Apr 2005 23:39:35 -0600 From: Jarrett & Heidi Johnson Subject: Re: [FlyRotary] Motor Mount Loads?? To: Rotary motors in aircraft Message-id: <01f701c5456b$568e7100$3476a58e@jarretpb17surw> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Mailer: Microsoft Outlook Express 6.00.2900.2180 Content-type: multipart/alternative; boundary="Boundary_(ID_4lldBjpkD4XFEBZMs6tlVA)" X-Priority: 3 X-MSMail-priority: Normal References: This is a multi-part message in MIME format. --Boundary_(ID_4lldBjpkD4XFEBZMs6tlVA) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Bill I just looked this up in Martini Hollman's book 'Modern Aircraft Design Vol.-1' here's a direct quote from Pg 78. "During a normal landing touch down is on the two main wheels and a limit landing load factor for these wheels should be greater than 2.67 per 14CFR, Part 23. From my experiance, both shock and rigid mounted landing gears can be designed to a limit landing load factor of 3 to 5.5 depending on the size, shock system and landing speed of the a/c. We are allowed to subtract out a lift factor of 0.667." Also you had asked if I'd done any checking on the motor mount depicted in some of my pictures. I did a quick and dirty check to see what happens w/ the basic load and wasn't quite satisfied so I upped some of the mat'l thicknesses and am re-running it as I write this. If you want, I'd be glad to pass on what info I have to you. { off list } I haven't found any info on motor mount loads as of yet but will pass them on if I come across them. I just used 9g+ and 4.5- for mine w/ a small side load [ the first check] the second one is a bit more in depth w/ a torque load also. Jarrett Johnson ----- Original Message ----- From: Bill Dube To: Rotary motors in aircraft Sent: Monday, April 18, 2005 9:18 AM Subject: [FlyRotary] Motor Mount Loads?? When designing an engine mount, what loads should you design to? Of course, the mount must withstand the ultimate loads of +9 g and -4.5 g, but what about gyroscopic loads imposed by the spinning engine and prop during abrupt maneuvers? What landing gear loads would be prudent? Thanks in advance, Bill Dube' >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html --Boundary_(ID_4lldBjpkD4XFEBZMs6tlVA) Content-type: text/html; charset=iso-8859-1 Content-transfer-encoding: 7BIT
Bill I just looked this up in Martini Hollman's book 'Modern Aircraft Design Vol.-1'  here's a direct quote from Pg 78. 
 
"During a normal landing touch down is on the two main wheels and a limit landing load factor for these wheels should be greater than 2.67 per 14CFR, Part 23. From my experiance, both shock and rigid mounted landing gears can be designed to a limit landing load factor of 3 to 5.5 depending on the size, shock system and landing speed of the a/c. We are allowed to subtract out a lift factor of 0.667."
 
Also you had asked if I'd done any checking on the motor mount depicted in some of my pictures. I did a quick and dirty check to see what happens w/ the basic load and wasn't quite satisfied so I upped some of the mat'l thicknesses and am re-running it as I write this. If you want, I'd be glad to pass on what info I have to you. { off list }
 
I haven't found any info on motor mount loads as of yet but will pass them on if I come across them. I just used 9g+ and 4.5- for mine w/ a small side load [ the first check] the second one is a bit more in depth w/ a torque load also.
 
Jarrett Johnson
----- Original Message -----
From: Bill Dube
Sent: Monday, April 18, 2005 9:18 AM
Subject: [FlyRotary] Motor Mount Loads??

When designing an engine mount, what loads should you design to?

Of course, the mount must withstand the ultimate loads of +9 g and -4.5 g, but what about gyroscopic loads imposed by the spinning engine and prop during abrupt maneuvers?

What landing gear loads would be prudent?

Thanks in advance,

Bill Dube' 

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