Early Pica 1/5 Spitfire  
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All Forums >> RC Airplanes >> RC Scale Aircraft >> Early Pica 1/5 Spitfire
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Early Pica 1/5 Spitfire - 7/5/2003 9:00:49 AM   
wood&fabric


 

Posts: 52
Joined: 1/20/2002
From: Winnipeg, MB, CANADA
Status: offline 		I've been reading past threads on the Pica 1/5 Spit, having recently bought an original issue kit from a guy who's brother started building (the fin only) it.

My question is about the CG location on this kit vs present editions and whether Pica changed anything in order to e.g. cure the tail heaviness problem so frequently cited by owners, or otherwise tweak the kit for better or worse.

At the present time I only have an Asp 1.08 Redhead for a possible engine. Thanks, Brian Paterson
       Post #: 1

Pica !/5 Spit - 7/5/2003 4:26:25 PM   
Countryboy



Posts: 1510
Joined: 12/17/2001
From: Lawrenceburg, KY, USA
Status: offline 		Brian,

Based on how old you say your kit is, it could possibly show the wrong CG balance point. Several of the original Spitfire's were lost on the maiden flight due too an incorrect CG balance shown on the plans. Some of the original plans showed the CG as being six or six & half inches "Don't Remember Which" back from the leading edge; measured from the leading edge dowel.

The correct CG should be four to four & half inches measured straight back from the leading edge dowel.

Since no building has really commenced, you need to take every avenue to keep the structure as light as possible from the CG back, even if this means buying new contest grade wood. Use lightening procedures every where possible without sacrifice to structural integrity.

Get ready to spring the bucks for another engine.... as the ASP 1.08 is not going to cut the mustard. Gas will be the way to go, because you will need the weight in the front even with the lightening procedures done aft of the CG.

Mine was flown with a S/T 3000 with an OS 7D carb spinning an 18/10 prop at 8,500 RPM. All up weight was 25lbs. which included five lbs. of lead ballast to balance. See what I mean by needing the added weight of a gas engine... beside the reliability factor.

(in reply to wood&fabric)
       Post #: 2

Early Pica 1/5 Spitfire - 7/5/2003 8:39:25 PM   
wood&fabric


 

Posts: 52
Joined: 1/20/2002
From: Winnipeg, MB, CANADA
Status: offline 		Countryboy,

Thanks very much for that info. Was pretty sure the 1.08 was too minimal, however one thread said he used an OS 1.08. I'll go gas as I have several convertible engines just waiting for action. Thanks again, Brian

(in reply to wood&fabric)
       Post #: 3

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