RE: CD ScaleDesigns Sopwith Snipe build  
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RE: CD ScaleDesigns Sopwith Snipe build - 5/20/2008 7:04:08 PM   
bokuda



Posts: 497
Joined: 4/12/2002
From: South Deerfield, MA, USA
Status: offline 		<<I still don't have an intuitive sense for which way to move the rudder as the model transitions from "towards me" to "away from me.">>

Try imagining yourself in the cockpit of the plane as you're flying it. It makes which way to move the rudder more intuitive. At least it works for meexcept at a pattern contest of course! (inverted, toward you, away from you, going straight up/down looking at the belly of the plane etc., gets a little more involved!)

(in reply to abufletcher)
       Post #: 1501

RE: CD ScaleDesigns Sopwith Snipe build - 5/22/2008 8:29:02 PM   
abufletcher



Posts: 5154
Joined: 2/13/2004
From: Zentsuji, JAPAN
Status: online 		A couple of details crossed off the list. I don't really like this level of detailing but I figure I've come this far....

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(in reply to bokuda)
       Post #: 1502

RE: CD ScaleDesigns Sopwith Snipe build - 5/22/2008 9:21:43 PM   
vonJaerschky



Posts: 205
Joined: 8/25/2002
From: Comox, BC, CANADA
Status: offline
quote:

ORIGINAL: abufletcher

I don't really like this level of detailing


Yeah, yuck. Looks just awful

(in reply to abufletcher)
       Post #: 1503

RE: CD ScaleDesigns Sopwith Snipe build - 5/22/2008 9:37:22 PM   
smcouch77



Posts: 654
Joined: 10/31/2006
From: Indianapolis, IN, USA
Status: offline 		Looks great Don. What is the cone shaped thingy?
Steve

_____________________________

Life is too short to fly ugly airplanes!

(in reply to vonJaerschky)
       Post #: 1504

RE: CD ScaleDesigns Sopwith Snipe b... - 5/22/2008 9:57:20 PM   
vonJaerschky



Posts: 205
Joined: 8/25/2002
From: Comox, BC, CANADA
Status: offline 		I think it's the venturi for the air speed indicator.

(in reply to smcouch77)
       Post #: 1505

RE: CD ScaleDesigns Sopwith Snipe build - 5/23/2008 6:09:47 AM   
abufletcher



Posts: 5154
Joined: 2/13/2004
From: Zentsuji, JAPAN
Status: online
quote:

ORIGINAL: smcouch77
Looks great Don. What is the cone shaped thingy?


My understanding is that the venturi "exhauster" works as a pressure driven fuel pump.

(in reply to smcouch77)
       Post #: 1506

RE: CD ScaleDesigns Sopwith Snipe build - 5/23/2008 11:59:13 AM   
abufletcher



Posts: 5154
Joined: 2/13/2004
From: Zentsuji, JAPAN
Status: online 		It's good to be in the air again! Did five flights with the rebuilt Cub today. The first ended in a deadstick but after some adjustments of the needle valve and throttle radio settings everything seemed ok. I still need to have the club "Saito pro" do some fine-tuning on the low end. Landings were all fine except for the one when I flipped it over because of some tall grass on the field.

I took it easy today and after getting the trim adjusted (model was a bit nose heavy after the rebuild) I just did casual circuits of the field working on coordinated rudder/aileron turns. One thing I noticed was that although I've gotten comfortable initiating my turns with rudder, I never level out with opposite rudder I'm using aileron only to come out of the turns. So I need to get used to get used to a "rudder in/rudder out" habit. The Cub is really a good practice plane and I apologize for all of the unkind things I've said about Cubs in the past.

(in reply to abufletcher)
       Post #: 1507

RE: CD ScaleDesigns Sopwith Snipe build - 5/23/2008 1:56:28 PM   
vonJaerschky



Posts: 205
Joined: 8/25/2002
From: Comox, BC, CANADA
Status: offline
quote:

ORIGINAL: abufletcher

quote:

ORIGINAL: smcouch77
Looks great Don. What is the cone shaped thingy?


My understanding is that the venturi "exhauster" works as a pressure driven fuel pump.



Of course! The airspeed pitot tube is mounted on one of the wing struts.

(in reply to abufletcher)
       Post #: 1508

RE: CD ScaleDesigns Sopwith Snipe b... - 5/23/2008 3:17:14 PM   
US185Damiani



Posts: 806
Joined: 3/29/2002
From: Danville, PA, USA
Status: offline 		LOL usually a venturi is used to create a vacuum for instruments in modern AC unfortunately I'm not exactly sure what it would have been used for in WWI

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A good landing is one you can walk away from, but, a great landing is when you can re-use the airplane.... immediately

(in reply to vonJaerschky)
       Post #: 1509

RE: CD ScaleDesigns Sopwith Snipe b... - 5/25/2008 1:51:18 PM   
abufletcher



Posts: 5154
Joined: 2/13/2004
From: Zentsuji, JAPAN
Status: online 		The Saito is now OUT of the Cub, all clean, and ready to be installed on the Snipe! There is an odd sort of relief in this.

I got in four more flights on the Cub today (Sun.) and figured there's just no point in risking the engine any further. It seems to be just as strong as before the crash with good compression and easy to start. I was still having a couple of issues with the idle setting on the new carb (and in fact had two deadsticks at idle) but I figure that's really just a setup problem on the Cub. I'll have to readjust everything again on the Snipe anyway with a new servo connection. Once it's in the Snipe and everything's ready, I'll have the club Saito expert get it ticking over perfectly like it was before.

So it's out. Finally!!! Hopefully to be replaced with a Saito 56 so I can keep on flying and practicing.

And, of course, this means I can now get on with finalizing the front end of the Snipe.

In terms of detailing, I've now finished the pitot tube, the verturi "pump" the cowl mounted gun-sight, and the (mock) cabane cross-bracing wires. I cut out some bits of brass tube to make an aldus sight but since the sight seems to have been mounted on the underside of the center-section that's a bit of a hassle and would make taking off the top cowling a bit more difficult. Also I'm not sure the original used BOTH the cross-hairs AND the aldus site.

Nothing worth photographing yet.

(in reply to US185Damiani)
       Post #: 1510

RE: CD ScaleDesigns Sopwith Snipe b... - 5/25/2008 1:52:50 PM   
abufletcher



Posts: 5154
Joined: 2/13/2004
From: Zentsuji, JAPAN
Status: online
quote:

ORIGINAL: US185Damiani
LOL usually a venturi is used to create a vacuum for instruments in modern AC unfortunately I'm not exactly sure what it would have been used for in WWI


I think the answer was: To suck fuel into the carburator.

(in reply to abufletcher)
       Post #: 1511

RE: CD ScaleDesigns Sopwith Snipe b... - 5/25/2008 2:03:57 PM   
V2PLUS10


 

Posts: 662
Joined: 5/31/2003
From: Boise, ID,
Status: offline 		Just for fun, google Henri Pitot, inventor of the pitot tube. Born 1695....a loooong time before airplanes. Henri's device was originally used to measure water flow in the Seine River. The use has changed but the theory remains...!

Randy

(in reply to abufletcher)
       Post #: 1512

RE: CD ScaleDesigns Sopwith Snipe b... - 5/25/2008 2:28:29 PM   
abufletcher



Posts: 5154
Joined: 2/13/2004
From: Zentsuji, JAPAN
Status: online 		Looks like your guy beats out my guy:

http://en.wikipedia.org/wiki/Giovanni_Battista_Venturi

(in reply to V2PLUS10)
       Post #: 1513

RE: CD ScaleDesigns Sopwith Snipe b... - 5/25/2008 2:36:11 PM   
V2PLUS10


 

Posts: 662
Joined: 5/31/2003
From: Boise, ID,
Status: offline 		That's cool.....it is interesting to know the origin of these "modern" devices..!!

Just to twist things a little...the Hanriot HD-1 used a venturi as a pitot tube....well, the venturi served the same purpose as a pitot, guess it depended on how the airspeed instrument was built....

Randy

(in reply to abufletcher)
       Post #: 1514

RE: CD ScaleDesigns Sopwith Snipe b... - 5/26/2008 1:07:45 PM   
abufletcher



Pos