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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost05.isp.att.net ([207.115.11.55] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2630742 for flyrotary@lancaironline.net; Fri, 04 Jan 2008 09:28:47 -0500 Received-SPF: none receiver=logan.com; client-ip=207.115.11.55; envelope-from=rusty@radrotary.com Received: from rad (adsl-065-006-194-009.sip.pns.bellsouth.net[65.6.194.9]) by isp.att.net (frfwmhc05) with SMTP id <20080104142805H0500d2bgoe>; Fri, 4 Jan 2008 14:28:06 +0000 X-Originating-IP: [65.6.194.9] From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: Another RV-3B (LSA style) Date: Fri, 4 Jan 2008 08:28:04 -0600 Message-ID: <000001c84ede$056cc5e0$6c01a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C84EAB.BAD255E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 Importance: Normal Thread-Index: AchO3gNzYWYEPwFWRwOcBJI/kDEqFA== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C84EAB.BAD255E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, =20 I've sent off my order for an RV-3B kit, with the intention of making it Sport Pilot compliant. After searching the new kits that are, or will = be available in that category, I just wasn't happy with anything I saw. It just seems like all the new planes are coming out of the same mold, SBS seating, nose gear, 912S engine, etc. Since I almost never carry passengers anyway, and currently have an RV-8 at my disposal as well, = the RV-3B is just a great choice. =20 =20 The more I thought about it, the more I realized that the RV-3 should be able to make LSA standards fairly easily. The weight is certainly not = an issue, and the stall speed shouldn't be either (though it will be = close). The big issue is keeping the speed below the 120kt limit for Vh (top = speed at max continuous rated power), but with the right engine, no wheel = pants, climb prop, I think this should be very doable as well. Even that limit should allow 150 mph TAS at altitude, which is plenty for the type = flying I do. =20 =20 The biggest choice to make is the engine. Overall, the plane will be = built as light as possible, with very basic systems. Van's allows 100-200HP engines, but there's very little data on engines below 125 HP. I'm currently looking at the O-200 and O-235, but the single rotor engine is also still very much in the running (so to speak). =20 =20 I've said that using stock housings would make it too heavy to work in = the 912S designs, but that it would work well in aircraft made for = conventional aircraft engines in the 100-125 range. The problem is getting an = honest 100-125 HP at 6000 rpm (the rpm limit of the redrive damper). The = solution will be either a new damper, or more likely "unnatural aspiration" as = our long lost buddy Leon would say. =20 =20 Another plus for the single rotor is that I would be the engine manufacturer, and would set the "maximum continuous power rating" used = for the Vh speed. It's easy to imagine setting a 2-3 psi limit for = continuous boost, but yet be able to go much higher for a limited time. This could = be quite reasonable in fact, particularly if I don't have an intercooler. =20 =20 I'll have lots of time to think about all this before I have to make a decision. In the mean time, I'll get back to work tinkering with the = single rotor, while I wait for the kit. =20 =20 Any bets on whether this will be flying before Tracy flies his RV-8 :-) =20 Cheers, Rusty =20 =20 ------=_NextPart_000_0001_01C84EAB.BAD255E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Greetings,

I've sent off = my order for=20 an RV-3B kit, with the intention of making it Sport Pilot = compliant. After=20 searching the new kits that are, or will be available in that category, = I just=20 wasn't happy with anything I saw. It just seems like all the new = planes=20 are coming out of the same mold, SBS seating, nose gear, 912S engine,=20 etc. Since I almost never carry passengers anyway, and=20 currently have an RV-8 at my disposal as well, the RV-3B is just a = great=20 choice.

The more I = thought about=20 it, the more I realized that the RV-3 should be able to make LSA = standards=20 fairly easily. The weight is certainly not an issue, and the stall = speed=20 shouldn't be either (though it will be close). The big issue is keeping = the speed=20 below the 120kt limit for Vh (top speed at max continuous rated power), = but with=20 the right engine, no wheel pants, climb prop, I think this should be = very doable=20 as well. Even that limit should allow 150 mph TAS at altitude, = which is=20 plenty for the type flying I do.

The = biggest choice to=20 make is the engine. Overall, the plane will be built as light as=20 possible, with very basic systems. Van's allows 100-200HP = engines,=20 but there's very little data on engines below 125 = HP. I'm=20 currently looking at the O-200 and O-235, = but the=20 single rotor engine is also still very much in the running (so to = speak). =20

I've said = that using=20 stock housings would make it too heavy to work in the 912S = designs,=20 but that it would work well in aircraft made for conventional aircraft = engines=20 in the 100-125 range. The problem is getting an honest = 100-125 HP at=20 6000 rpm (the rpm limit of the redrive damper). The solution will = be=20 either a new damper, or more likely "unnatural aspiration" as our = long lost=20 buddy Leon would say.

Another plus = for the single=20 rotor is that I would be the engine manufacturer, and would set the = "maximum=20 continuous power rating" used for the Vh speed. It's easy to = imagine=20 setting a 2-3 psi limit for continuous boost, but yet be able to go much = higher=20 for a limited time. This could be quite reasonable in fact, = particularly=20 if I don't have an intercooler.

I'll have lots = of time to=20 think about all this before I have to make a decision. In the mean = time,=20 I'll get back to work tinkering with the single rotor, while I wait for = the=20 kit.

Any bets on = whether this=20 will be flying before Tracy flies his RV-8 :-)

Cheers,

Rusty

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