Return-Path: Received: from [199.185.220.220] (HELO priv-edtnes03-hme0.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.1) with ESMTP id 2510726 for flyrotary@lancaironline.net; Mon, 04 Aug 2003 04:36:44 -0400 Received: from Endurance ([207.194.22.92]) by priv-edtnes03-hme0.telusplanet.net (InterMail vM.5.01.05.17 201-253-122-126-117-20021021) with SMTP id <20030804083641.ICQI16085.priv-edtnes03-hme0.telusplanet.net@Endurance> for ; Mon, 4 Aug 2003 02:36:41 -0600 From: "Haywire" To: "Rotary motors in aircraft" Subject: Tachs other stuff Date: Mon, 4 Aug 2003 01:36:27 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0043_01C35A28.D27524B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0043_01C35A28.D27524B0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit MessageHi Rusty & All; Good to hear the tiny tach works. Now we have 2 tach methods for us with the EC2/LS1 combo. I borrowed an optical tach today and tested my solution. It works fine. I made a quick spreadsheet to convert figures from the 2 blade optical tach to 3 blade X 2.17 compared to indicated to give % error averaged over 8 different engine speeds. Results are only a 3.5% error. Close enough for me. Final inspection is scheduled for the weekend. Speaking of fuel gauges. I built all of my tanks with capacitive fuel plates, and planned to make my own converter using plans from one of Jim Weirs old KitPlanes articles to use a standard fuel gauge. When Tracy announced his EM2 I had abandoned this idea. Now I'm resurrecting this again. I've bought all the components and designed a board, but due to the cost of having boards made and not sure about the difficulties of making my own, I'm sort of wavering on this idea. My header tank (4.5 usg) has a sight tube, but the inspector hasn't been clear as to whether he will accept this without an indication on the main tanks. I'd really like to wait for the EM2 before doing the fuel levels, since the test period of 50 hours will keep me within range of base airport with header tank alone. I ended up with 1196lbs empty weight. More than I wanted, but not too bad when you consider I have 7 fuel tanks & associated plumbing, gear mounts for both TD & TG, muffler, muffler housing, full upholstery, turbocharger and a few other extras. Definitely not the aerobatic machine that you're trying to achieve, but it should fulfill it's mission. It's only a little more than a 100 lbs more than the factory 9a, but with a lot more power & range. What should I expect for a static RPM with a 76" 3 blade prop set at approx. mid range (60"). I can get 5000 RPM with about 2-3psi boost. This is not quite full throttle, but I don't really want to boost much at this altitude as I'm running the 9.4:1 rotors. Also the plane starts dragging at this, so I don't really want to push it any harder. Reading the archives I find Ed reports a static of 5200-5400 RPM, but that's a 2 blade ( ? X ? ). Tommy reported 4350 RPM with a 3 blade ( ? X 60) @30"MAP. S. Todd Bartrim Turbo 13B RV-9Endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Whatever you vividly imagine, Ardently desire, Sincerely believe in, Enthusiastically act upon, Must inevitably come to pass". ------=_NextPart_000_0043_01C35A28.D27524B0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Hi=20 Rusty & All;
    Good to hear the tiny tach works. Now we have 2 = tach=20 methods for us with the EC2/LS1 combo. I borrowed an optical tach today = and=20 tested my solution. It works fine. I made a quick spreadsheet to convert = figures=20 from the 2 blade optical tach to 3 blade X 2.17 compared to indicated to = give %=20 error averaged over 8 different engine speeds. Results are only a = 3.5%=20 error. Close enough for me.
    Final inspection is scheduled for the weekend. = Speaking of=20 fuel gauges. I built all of my tanks with capacitive fuel plates, and = planned to=20 make my own converter using plans from one of Jim Weirs old KitPlanes = articles=20 to use a standard fuel gauge. When Tracy announced his EM2 I had = abandoned this=20 idea. Now I'm resurrecting this again. I've bought all the components = and=20 designed a board, but due to the cost of having boards made and not = sure=20 about the difficulties of making my own, I'm sort of wavering on this = idea. My=20 header tank (4.5 usg) has a sight tube, but the inspector hasn't been = clear as=20 to whether he will accept this without an indication on the main tanks. = I'd=20 really like to wait for the EM2 before doing the fuel levels, since the = test=20 period of 50 hours will keep me within range of base airport with header = tank=20 alone.
    I ended up with 1196lbs empty weight. More than = I wanted,=20 but not too bad when you consider I have 7 fuel tanks & associated = plumbing,=20 gear mounts for both TD & TG, muffler, muffler housing, full = upholstery,=20 turbocharger and a few other extras. Definitely not the aerobatic = machine that=20 you're trying to achieve, but it should fulfill it's mission. It's only = a little=20 more than a 100 lbs more than the factory 9a, but with a lot more = power=20 & range.
    What should I expect for a static RPM with a = 76" 3=20 blade prop set at approx. mid range (60"). I can get 5000 RPM with about = 2-3psi=20 boost. This is not quite full throttle, but I don't really want to boost = much at=20 this altitude as I'm running the 9.4:1 rotors. Also the plane starts = dragging at=20 this, so I don't really want to push it any harder. Reading the archives = I find=20 Ed reports a static of 5200-5400 RPM, but that's a 2 blade ( ? X ? ). = Tommy=20 reported 4350 RPM with a 3 blade ( ? X 60) @30"MAP.

S. Todd Bartrim
Turbo 13B = RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

=   =20 "Whatever you vividly imagine, Ardently desire, Sincerely believe in,=20 Enthusiastically act upon, Must inevitably come to pass".

 
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