X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 17 Aug 2008 12:12:23 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d23.mx.aol.com ([205.188.139.137] verified) by logan.com (CommuniGate Pro SMTP 5.2.6) with ESMTP id 3078728 for lml@lancaironline.net; Fri, 15 Aug 2008 18:49:58 -0400 Received: from Sky2high@aol.com by imo-d23.mx.aol.com (mail_out_v38_r10.8.) id q.d5a.2b2d262d (32914) for ; Fri, 15 Aug 2008 18:49:54 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Fri, 15 Aug 2008 18:49:54 EDT Subject: Re: [LML] Re: Spinner Backplate Needed X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1218840594" X-Mailer: Unknown sub 34 X-Spam-Flag:NO -------------------------------1218840594 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Mark and Steve, 1. Some spinner back plates will crack because the stamping was not flat and could flex regardless of what was done to keep it whole. 2. A delaying fix was to rivet 1/8" doubler plates around the mounting holes. Note: bucked rivets are better than squeezed rivets for this job as the squeezed rivets can lose their heads from work hardening. 3. Fiberglass spinners are flexible and should be reinforced, especially around the prop cutouts since the natural flex allows for unusual stresses on the back plate. 4. The best thing to do to eliminate any cracking is to use a forward bulkhead or support for the spinner. Fixed pitch props allow the builder to easily install a bulkhead to the face of the prop. Constant speed props with a cup allow for several solutions - If the cup comes close enough to the spinner, one could use Saran wrap as a release, goop a bead of sillycon on the cup or the spinner (Saran on the other part) in order to stabilize the spinner. If it is a Hartzell prop, there are four available tapped mounting holes on the end of the cup and a bulkhead could be mounted there. 5. Always dynamically balance the prop after messing around with this stuff (solutions 1-4). Mark - I purchased an aluminum spinner kit from Aricraft Spruce some years ago (after my backplate went Tango Uniform), placed a doubler on the back plate and constructed a forward bulkhead, lathe cut to match the angle of the spinner, from nylon (about 1/4" thick) - the final fit included a thin film of silicon around the outer edge of the bulkhead for a really tight fit to the spinner. I do have a Hartzell CS prop. This should clear up a rumor about me using a peculiar back plate. Grayhawk In a message dated 8/15/2008 3:26:27 P.M. Central Daylight Time, mjrav@comcast.net writes: Hi, I seem to remember someone making one out of plastic - maybe HDPE 1/2" thick or so. I may have been Greyhawk. If it does not come up and you can't find it in a search, you might inquire of him. My 360 is up to 1444 hrs now without ever cracking the stock plates. A clever mechanic suggested early on to make silicone rubber ridges on the frontplate so that there is supporting pressure there. It must work. Mark Ravinski ----- Original Message ----- From: _Steve & Kelly Rosenzweig_ (mailto:krosenzweig@socal.rr.com) To: _lml@lancaironline.net_ (mailto:lml@lancaironline.net) Sent: Thursday, August 14, 2008 5:53 AM Subject: [LML] Spinner Backplate Needed I recently accomplished my annual on my 360 MKII and found the spinner backplate was terribly cracked at all four attach points to the prop hub. I was certainly happy to find this before it departed the airplane on it's own, but I wasn't happy when the factory told me the part is on back order with no due date in sight. The mechanic at first did not want me to fly it out without the spinner, but after conferring with Hartzell and the factory, both said it would be no problem. So I flew 30 minutes to get home with no problems in cooling or vibration. Didn't even really notice any reduction in speed due to added drag. Anyway, I'm hoping someone out there might have an extra spinner backplate that's not drilled, or a matched backplate and spinner assy. I have a HC-F2YR-1F constant speed prop and believe the spinner mounting kit p/n is A2476-31 according to my prop log. Just for reference, my spinner backplate is 11 3/4" dia and the dome is 12 11/16" tall. I'd be happy to pay any reasonable price. Feel free to email me off line at _steven_rosenzweig2002@yahoo.com_ (mailto:steven_rosenzweig2002@yahoo.com) if you have parts for sale. If nothing else, this is an important item to check regularly. TTAF and engine are only 345 hrs for this plane that began flying in 2004. I also have two entries in the prop log book showing one dynamic balance accomplished to .013 IPS and another to .03 IPS. thanks Steve **************Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos. (http://autos.aol.com/cars-Volkswagen-Jetta-2009/expert-review?ncid=aolaut00030000000007 ) -------------------------------1218840594 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Mark and Steve,
 
1. Some spinner back plates will crack because the stamping was no= t=20 flat and could flex regardless of what was done to keep it whole.
 
2. A delaying fix was to rivet 1/8" doubler plates around the= =20 mounting holes.  Note: bucked rivets are better than squeezed rivets fo= r=20 this job as the squeezed rivets can lose their heads from work hardening.
 
3. Fiberglass spinners are flexible and should be reinforced, especiall= y=20 around the prop cutouts since the natural flex allows for unusual stres= ses=20 on the back plate.
 
4.  The best thing  to do to eliminate any cracking is to use= a=20 forward bulkhead or support for the spinner.  Fixed pitch props allow t= he=20 builder to easily install a bulkhead to the face of the prop.  Constant= =20 speed props with a cup allow for several solutions - If the cup comes close=20 enough to the spinner, one could use Saran wrap as a release, goop a be= ad=20 of sillycon on the cup or the spinner (Saran on the other part) in order to=20 stabilize the spinner.  If it is a Hartzell prop, there are four availa= ble=20 tapped mounting holes on the end of the cup and a bulkhead could be mou= nted=20 there.
 
5. Always dynamically balance the prop after messing around with this s= tuff=20 (solutions 1-4).
 
Mark - I purchased an aluminum spinner kit from Aricraft Spruce some ye= ars=20 ago (after my backplate went Tango Uniform), placed a doubler on the back pl= ate=20 and constructed a forward bulkhead, lathe cut to match the angle o= f=20 the spinner, from nylon (about 1/4" thick) - the final fit included a t= hin=20 film of silicon around the outer edge of the bulkhead for a really tight fit= to=20 the spinner.  I do have a Hartzell CS prop.
 
This should clear up a rumor about me using a peculiar back plate.
 
Grayhawk
 
In a message dated 8/15/2008 3:26:27 P.M. Central Daylight Time,=20 mjrav@comcast.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>
Hi,
I seem to remember someone making one out= of=20 plastic - maybe HDPE  1/2" thick or so.
I may have been Greyhawk.  If it doe= s not=20 come up and you can't find it in a search, you might inquire of=20 him.
 
My 360 is up to 1444 hrs now without ever= =20 cracking the stock plates.  A clever mechanic suggested early on to m= ake=20 silicone rubber ridges on the frontplate so that there is supporting press= ure=20 there.  It must work.
 
Mark Ravinski
----- Original Message -----
Fr= om:=20 Steve & Kelly Rosenzweig=20
Sent: Thursday, August 14, 2008 5= :53=20 AM
Subject: [LML] Spinner Backplate=20 Needed

I recently accomplished my annual on my= 360=20 MKII and found the spinner backplate was terribly cracked at all four at= tach=20 points to the prop hub.  I was certainly happy to find this before=20= it=20 departed the airplane on it's own, but I wasn't happy when the factory t= old=20 me the part is on back order with no due date in sight.
 
The mechanic at first did not want me t= o fly it=20 out without the spinner, but after conferring with Hartzell and the fact= ory,=20 both said it would be no problem.  So I flew 30 minutes to get home= =20 with no problems in cooling or vibration.  Didn't even really notic= e=20 any reduction in speed due to added drag.
 
Anyway, I'm hoping someone out there mi= ght have=20 an extra spinner backplate that's not drilled, or a matched backplate an= d=20 spinner assy.  I have a HC-F2YR-1F constant speed prop and believe=20= the=20 spinner mounting kit p/n is A2476-31 according to my prop log.  Jus= t=20 for reference, my spinner backplate is 11 3/4" dia and the dome is 12 11= /16"=20 tall.
 
I'd be happy to pay any reasonable pric= e. =20 Feel free to email me off line at steven_rosenzweig2002@ya= hoo.com=20 if you have parts for sale.
 
If nothing else, this is an important i= tem to=20 check regularly.  TTAF and engine are only 345 hrs for this plane t= hat=20 began flying in 2004.  I also have two entries in the prop log book= =20 showing one dynamic balance accomplished to .013 IPS and another to .03=20 IPS.
 
thanks
 
Steve
 


Looking for a car that's sporty, fun and= fits in your budget? Read reviews on AOL Autos.
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