X-Virus-Scanned: clean according to Sophos on Logan.com From: "Finn Lassen" Received: from omr-m019e.mx.aol.com ([204.29.186.18] verified) by logan.com (CommuniGate Pro SMTP 6.1.14) with ESMTPS id 9411400 for flyrotary@lancaironline.net; Sat, 28 Jan 2017 14:01:22 -0500 Received-SPF: pass receiver=logan.com; client-ip=204.29.186.18; envelope-from=finn.lassen@verizon.net Received: from mtaout-mac02.mx.aol.com (mtaout-mac02.mx.aol.com [172.26.222.206]) by omr-m019e.mx.aol.com (Outbound Mail Relay) with ESMTP id 00BBB380009B for ; Sat, 28 Jan 2017 14:01:04 -0500 (EST) Received: from [192.168.1.3] (0x5b3139322e3136382e312e335d [174.227.13.39]) by mtaout-mac02.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 82DA3380000AC for ; Sat, 28 Jan 2017 14:00:59 -0500 (EST) Subject: Re: [FlyRotary] Finn's RV-3 Performance To: Rotary motors in aircraft References: Message-ID: Date: Sat, 28 Jan 2017 14:00:58 -0500 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:45.0) Gecko/20100101 Thunderbird/45.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------2D5AA89EF614E43EBC5FB90A" x-aol-global-disposition: G X-AOL-VSS-INFO: 5800.7501/114172 X-AOL-VSS-CODE: clean x-aol-sid: 3039ac1adece588cea6b65fc X-AOL-IP: 174.227.13.39 This is a multi-part message in MIME format. --------------2D5AA89EF614E43EBC5FB90A Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Try 892. Granted 440 lbs digital bathroom scales, but probably close enough for the truth. Add 180 for pilot and 30 for fuel, 1,102 and over aerobatic gross weight just like that. I know I should easily be able to keep loops below 3.5 Gs, but don't trust myself to do so. Haven't been doing loops since 2005 in my old RV-3. Hushpower muffler hung below and after the firewall which I lost shortly after I got the plane, which I replaced and secured better. Still loud in the cockpit (those are turbo housings w/o splitters), so I hung a 3' 2 1/4" SS pipe after it to get exhaust behind seat. I guess the innards were soon blown out of the muffler. So too loud and I fishtailed the end shut and drilled 5 rows of 1/8" holes on bottom of last half of the pipe. Amount of holes calculated to equal area of 2 1/4" pipe. That made the noise tolerable for me. Finn On 1/27/2017 3:28 PM, Doug Lomheim wrote: > "...I regularly do see 2,500 fpm or more after take off, even though > it's built too heavy (electric water pump, SS hoses, brackets, etc. > that could be lighted). Still haven't gotten up the courage to do a > loop because it's over gross aerobatic weight even with 5 gals of fuel. > > Finn” > > Finn: > > Thanks for the reply! So your empty weight must be 850 pounds or so? > > What did you do for a muffler…hang an external one on the bottom or > tuck one in the cowling somehow? > > Take care, > > Doug > > > --------------2D5AA89EF614E43EBC5FB90A Content-Type: multipart/related; boundary="------------CE421AB2AF64DDAA59B792CE" --------------CE421AB2AF64DDAA59B792CE Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

Try 892. Granted 440 lbs digital bathroom scales, but probably close enough for the truth.

Add 180 for pilot and 30 for fuel, 1,102 and over aerobatic gross weight just like that.

I know I should easily be able to keep loops below 3.5 Gs, but don't trust myself to do so. Haven't been doing loops since 2005 in my old RV-3.

Hushpower muffler hung below and after the firewall which I lost shortly after I got the plane, which I replaced and secured better.
Still loud in the cockpit (those are turbo housings w/o splitters), so I hung a 3' 2 1/4" SS pipe after it to get exhaust behind seat. I guess the innards were soon blown out of the muffler. So too loud and I fishtailed the end shut and drilled 5 rows of 1/8" holes on bottom of last half of the pipe. Amount of holes calculated to equal area of 2 1/4" pipe. That made the noise tolerable for me.

Finn

On 1/27/2017 3:28 PM, Doug Lomheim wrote:

"...I regularly do see 2,500 fpm or more after take off, even though it's built too heavy (electric water pump, SS hoses, brackets, etc. that could be lighted). Still haven't gotten up the courage to do a loop because it's over gross aerobatic weight even with 5 gals of fuel.

Finn”

Finn:

Thanks for the reply! So your empty weight must be 850 pounds or so?

What did you do for a muffler…hang an external one on the bottom or tuck one in the cowling somehow?

Take care,

Doug

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