RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines.

RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (Full Version)

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Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/1/2008 12:08:06 AM)
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

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

77chickenhawk -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/1/2008 7:30:04 PM)
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

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/4/2008 4:43:36 PM)
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

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/5/2008 6:00:39 PM)
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

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/10/2008 11:00:42 PM)
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

SCALECRAFT -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/11/2008 4:55:35 AM)
Try China. They make most of the planes this would go on. Steve

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/14/2008 6:34:47 PM)
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

77chickenhawk -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/14/2008 6:44:29 PM)
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

tony-howard -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/14/2008 7:15:11 PM)
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

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/14/2008 8:25:42 PM)
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.

SCALECRAFT -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/15/2008 5:04:58 PM)
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

SCALECRAFT -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/18/2008 6:03:30 PM)
Here should be a pic of the RCV 120 shaft. Steve

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/18/2008 10:06:35 PM)
Thanks Steve. I was a little concerned after you posted your dimensions becuase the unthreaded portion of the prop shaft is a little longer on the 120 than it is on the 90. But after playing around with the numbers and confirming the fit in SolidWorks, it will work just as well for either engine. Here was the concern... The position of the actuator sets the pitch on each prop (and makes sure they each have the same pitch). The actuator screws into the prop shaft. The further you screw it in, the smaller the pitch. When you screw it in all the way so that it presses against the rear hub half and the rear hub half presses against the drive plate, that's zero pitch. I just had to be certain that the thickness of the rear hub half plus the thickness of the actuator is greater than the unthreaded portion of the prop shaft. It turns out that there is more than enough thickness (and material) to create threads in the actuator for the 120. So... Nothing broken, nothing fixed. Josh

SCALECRAFT -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/19/2008 4:04:48 AM)
Interesting way to do it. I just finished securing my 120 to my VQ 60 size Hurricane so i can turn a scale 3 blade i still have to configure. good luck Steve

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/19/2008 4:47:28 AM)
I learned how to use a few more useful features of SolidWorks. Attached is a picture of an exploded view of the entire assembly. All the required parts are labelled and listed. Also listed is who supplies each part. And here's another animation of it being exploded and collapsed: 1/8 Scale hub: Explode and Collapse Josh

SCALECRAFT -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/19/2008 5:06:40 AM)
Thats a pretty good animation. Steve

SMUGator -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/19/2008 6:20:39 AM)
Good stuff there. I'm looking forward to seeing how these turn out. Tom

transatlanticflight -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/22/2008 4:09:53 PM)
Juice, That's a great looking project. Maybe you mentioned this earlier, but I was wondering what scale ARE the soloprop hubs designed for? Just curious - I have some 1/5 and 1/6th scale kits in the works. I also have a question for you about solidworks. I'm trying to design an engine and I'm looking for a good, reasonably priced cad software package - one that doesn't take 3 years to figure out! It seems that solidworks has a lot of time saving tools. Judging from your quick posts I would think it might be easier to learn Solidworks than the TurboCad software I recently purchased. Are you a designer/engineer by trade or is this software as easy to use as you make it seem? I looked at the website briefly, didn't see the cost of the software. Any help there? Also would you mind sharing how many hours of cad work you have so far on your hub project? Thanks and keep up the good work. Rick

77chickenhawk -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/23/2008 12:23:55 AM)
1/5/ - 1/6 perfect

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/23/2008 2:58:52 PM)
Rick... As 77chickenhawk says... The original Soloprop hub is perfect for 1/5 to 1/6 scale. At 1/7 to 1/8 scale it's to big, which is the reason for this project. I am a computer engineer by trade, but that's the wrong kind of engineer for this kind of stuff. SolidWorks 2008 is the easiest CAD software out there. The nice thing about SolidWorks is that it keeps your attention on the DESIGN, not the DRAWING. AutoCAD and TurboCAD are good DRAWING programs to use after the DESIGN has been finalized. Before this project, I slowly learned to use AutoCAD over the span of 2 or 3 years. I spend on average 1 hour per day working on this project. I started this project using AutoCAD. I spent the first 2 weeks creating a 3D model of the original Soloprop hub. Then I spent another 2 weeks re-designing the 1/8 version. Then I spent a month talking to CNC shops. I spent a couple days in re-drawing for each time they gave me a cost reduction tip. This was when I got fed up and switched to SolidWorks. I did one SolidWorks Tutorial per day for a week. I had everything re-drawn in SolidWorks in anoter week. Then it felt like no effort to draw other stuff like the props, the boss, the bolts. Even redrawing the RCV 90 is SolidWorks was easy, but it was a lot of measuring. If you're designing an engine, then SolidWorks has even more benefits for you. But now I'm starting to sound like a SolidWorks salesman. Josh

transatlanticflight -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/23/2008 6:26:35 PM)
Thanks for the info guys. I'll stay tuned. Going to order a soloprop for both my yellow projects and the kmp spit. Happy Easter Rick

77chickenhawk -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/23/2008 7:39:08 PM)
sweet.. of course, we'll have to see pic's of them after you get them....[:D]

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/26/2008 5:14:24 PM)
The machine shop will be receiving the material and tooling any time now. They said they will be ready when it arrives and plan to do the job right away. One hour in the machine for the front hub half, another hour for the rear hub half. These videos are NOT the hubs being milled, but this is the actual machine that will be doing the milling: http://www.youtube.com/watch?v=cHUra-WZc6k http://www.youtube.com/watch?v=SJdWMwpiaT4 He may, or may not, take video of the hubs being cut. It depends on how busy they are. But even if he does take video, the little hubs will disappear with all that coolant splashing around. Josh

Juice -> RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines. (3/31/2008 4:10:14 AM)
The machine shop received the material and the tooling on Friday. They said they will make the first prototype over the weekend and will send pictures of it on Monday. I can't wait to see how it looks. In the mean time, I pulled the RCV off the Corsair and put it on my test stand in preparation to test the new hubs when they arrive. Here are pictures with the original Soloprop hub on it. I just painted the prop tips. I also stuck on "Standard Steel Propeller Co." stickers. Except for the words, they looks exactly like the Hamilton Standard logo. Josh

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