RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines.  
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All Forums >> RC Airplanes >> RC Warbirds and Warplanes >> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines.
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RE: 1/8 scale functional Hamilton Standard hub for RC... - 3/1/2008 12:08:06 AM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		Hi Len,

I had contacted RCV about this project, but not about the suitability of Solo props.

The way I understand the issue, wood props are discouraged becuase they are too light and do not provide enough fly-wheel effect. That is why they recommend using heavy wood props (if you really need to use a wood prop).

Solo props are made from premium grade eastern maple. Although the blade themselves are lighter than an equivalent size composite prop, the weight of the aluminum hub makes the whole assembly on the heavy side. Actually, the original Solo hub is probably too heavy for a 1/8 warbird. I'm hoping the 1/8 hub will come in at a useable weight. SolidWorks has the ability to calculate weights. I'll give it a try.

Josh

(in reply to voyager_663rd)
       Post #: 51

RE: 1/8 scale functional Hamilton Standard hub for RCV ... - 3/1/2008 5:59:30 PM   
Michael211


 

Posts: 304
Joined: 9/11/2005
From: Splendora, TX, USA
Status: offline 		The current price point of around $200 for just the CNC'd hub is too deep for my pockets unfortunately. It'd need to be down around $100 before I could go that route, given the other parts that'd need to be purchased seperately to make it work.

However I have a question that I don't see addressed anywhere here... why isn't Carl of Solo Props interested in producing this hub in 1/8 scale for the H9 Corsair? It's an extremely popular model after all... I could easily see hundreds if not a thousand or more orders for a scale CNC aluminum hub for this airplane if the price was reasonable enough and it was advertised!

Solo Props would likely be able to have a thousand or more of these things made up in a batch, which would I'm sure drop the price down significantly...is there a reason that he's not interested in selling these things for the 1/8 scale Corsair?

Regards!

- Michael

(in reply to Juice)
       Post #: 52

RE: 1/8 scale functional Hamilton Standard hub for RC... - 3/1/2008 7:30:04 PM   
77chickenhawk



Posts: 88
Joined: 9/8/2006
From: Clovis, CA, USA
Status: offline 		solo blades are of great quality. i have seen them with no paint, and wow, nice. im spinning a 24 3 blade with a 12 pitch spinning 6500 static and "0" flex

(in reply to voyager_663rd)
       Post #: 53

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/4/2008 4:43:36 PM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		Michael,

I talked to Carl again yesterday about this project. He basically said what he said back in Januarry when I started the project... he has no time to start something new, even if I would be giving him a head start by doing all the CAD work for him. Later in an e-mail, I asked if I could get information about the CNC shop he uses (they have proven capabilities and may provide better prices), but no answer. That was a long shot. It's probably too much info to divulge. I don't blame him if he doesn't want to give out that information.

He does know about this thread. I hope he's listening to your input. I'd also like it of Soloprop produced a 1/8 scale hub at a reasonable price... As much as I'm enjoying doing this project, I'd like it better if someone else can do it cheaper.

Josh

(in reply to 77chickenhawk)
       Post #: 54

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/5/2008 6:00:39 PM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		I'm still waiting for a couple more people to give me a YES or NO answer.

In the mean time, I had a little fun with SolidWorks.

The computer screen shots are of the entire assembly, with 16" props and the Tru-Turn hub dome (minus the 13 bolts needed to tighten everything up). The real pictures are of the Soloprop hub, done and 16" props.

I'm posting these pictrues for size comparisons. I think it will look much nicer with the smaller hub.

Josh

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< Message edited by Juice -- 3/6/2008 4:07:30 PM >

(in reply to Juice)
       Post #: 55

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/10/2008 11:00:42 PM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		A check for half the total cost has been sent. Once the shop receives and deposits it, they will order the material and tooling. They will start the milling immediately after receiving the material and tooling.

In the mean time, I've been playing with the "Motion Study" feature of SolidWorks. This allows me to "virtually" check the fit of one component to another and reports any interfering parts. You can also do this while parts are moving. In this animation, I'm moving the actuator forward and backward, which in turn changes the pitch of each propellor.

Here's the link to the video...
Pitch Demo

Josh

(in reply to Juice)
       Post #: 56

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/11/2008 4:55:35 AM   
SCALECRAFT


 

Posts: 1320
Joined: 1/7/2002
From: MONTEBELLO, CA, USA
Status: offline 		Try China. They make most of the planes this would go on.

Steve

(in reply to Juice)
       Post #: 57

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/14/2008 6:34:47 PM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		Can someone with an RCV 120-SP please check the following dimensions:
A) Drive plate diameter.
B) Total length of prop shaft.
C) Threaded length of prop shaft.

I have the dimensions for the RCV 90-SP (also shown in the diagram):
A) 40 mm
B) 40.5 mm
C) 30 mm

I just want to be 100% sure that hub is compatible the RCV 120-SP dimension also.

Thanks,
Josh

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(in reply to SCALECRAFT)
       Post #: 58

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/14/2008 6:44:29 PM   
77chickenhawk



Posts: 88
Joined: 9/8/2006
From: Clovis, CA, USA
Status: offline 		my friend Doug, the one whos pitching in on the prop hub. has a 120 RCV i will ask him tonight if you dont have the answers by then. ok?

Bruce

(in reply to Juice)
       Post #: 59

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/14/2008 7:15:11 PM   
tony-howard


 

Posts: 273
Joined: 9/28/2004
From: Monroe, WA, USA
Status: offline 		The current discussion about prop mounting dimensions brought to mind the following ...

I have an RCV 90SP and started using the factory drawing converted to CAD for doing a tight installation. I later discovered it's a generic drawing and had to start over by measuring the actual engine.

Guess what I'm saying is that their listed dimensions are most likely correct, but the drawing is not. As I recall, the muffler portion in particular was way off. What seemed to fit in my cowl at first was nowhere close. It took a 2-3 OS elbows and a spacer to get it to fit inside the cowl. Now it looks like a drunken snake!

The problem was not RCV's fault, but mine for assuming.

FWIW

_____________________________

Tony
pacific-scaled-aircraft.com

(in reply to Juice)
       Post #: 60

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/14/2008 8:25:42 PM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		Bruce... Thanks. I'm pretty sure it's okay, but it doesn't hurt to check.

Tony... I made the same assumption when I first installed it on my previous TF Corsair. I ended up using a flex pipe to keep it in the cowl.

(in reply to tony-howard)
       Post #: 61

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/15/2008 5:04:58 PM   
SCALECRAFT


 

Posts: 1320
Joined: 1/7/2002
From: MONTEBELLO, CA, USA
Status: offline 		The SP 120 are the same.

Plate 40mm

Shaft 44.5mm

Thread 27.5.

Nice project. I'm doing a scale carbon 3 blade variable pitch system also for my 80" 109G. Not with the fancy hub like your though, just support lugs for my blades

good luck

Steve

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(in reply to Juice)
       Post #: 62

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/18/2008 6:03:30 PM   
SCALECRAFT


 

Posts: 1320
Joined: 1/7/2002
From: MONTEBELLO, CA, USA
Status: offline 		Here should be a pic of the RCV 120 shaft.

Steve

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(in reply to SCALECRAFT)
       Post #: 63

RE: 1/8 scale functional Hamilton Standard hub for R... - 3/18/2008 10:06:35 PM