X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from imo-d23.mx.aol.com ([205.188.139.137] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1873883 for flyrotary@lancaironline.net; Wed, 28 Feb 2007 10:14:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.137; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-d23.mx.aol.com (mail_out_v38_r7.6.) id q.cc8.ba95a1f (58808) for ; Wed, 28 Feb 2007 10:13:42 -0500 (EST) From: Lehanover@aol.com Message-ID: Date: Wed, 28 Feb 2007 10:13:42 EST Subject: Re: [FlyRotary] engine mount 4130 vs 304 SS To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1172675622" X-Mailer: 9.0 Security Edition for Windows sub 5359 X-Spam-Flag: NO -------------------------------1172675622 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 2/28/2007 9:12:01 A.M. Eastern Standard Time, rusty@radrotary.com writes: Greetings, As I ponder my choices for mounting the single rotor engine, I noticed something that surprised me. 304 stainless is cheaper than 4130 steel. One thing that's always bothered me about steel tube type construction is the concern for rusting inside the tubes, so stainless is appealing. There must be a catch here. Is there a good reason I should use 4130 instead of 304? Either will likely be sized much larger than needed, since I don't have the means to do any proper analysis of the strength. Thanks, Rusty (Autoflight drive supposed to be shipping next week) The 4130 can be gas welded. It will last longer than you will, if it is dry inside when welded. It is stronger than stainless in the same section. You can wash the inside with Linseed oil and weld the hole shut when finished. Then it will outlast all of us. You can use scrap 4130 from aircraft salvage. You can fix it anywhere there is a gas torch. Not just a TIG set. Rare at little airports. Check the Dillsburg aeroplane co. In Dillsburg Pa. for best new prices. Lynn E. Hanover

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In a message dated 2/28/2007 9:12:01 A.M. Eastern Standard Time,=20 rusty@radrotary.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

Greetings,

As I ponder my ch= oices=20 for mounting the single rotor engine, I noticed something that surprised=20 me. 304 stainless is cheaper than 4130 steel. One thing that's= =20 always bothered me about steel tube type construction is the concern for=20 rusting inside the tubes, so stainless is appealing. There must be a= =20 catch here.

Is there a good r= eason I=20 should use 4130 instead of 304? Either will likely be sized much lar= ger=20 than needed, since I don't have the means to do any proper analysis of the= =20 strength.

Thanks,

Rusty (Autoflight= drive=20 supposed to be shipping next week)

<= /SPAN>

The 4130 can be gas welded. It will last longer than you will, if it is= dry=20 inside when welded.

It is stronger than stainless in the same section.

You can wash the inside with Linseed oil and weld the hole shut when=20 finished. Then it will outlast all of us. You can use scrap 4130 from aircra= ft=20 salvage.

You can fix it anywhere there is a gas torch. Not just a TIG set. Rare=20= at=20 little airports.

Check the Dillsburg aeroplane co. In Dillsburg Pa. for best new=20 prices.

Lynn E. Hanover

= AOL now offers free email to everyone. Find out more about what's free from= AOL at AOL.com. -------------------------------1172675622--