Mustang Exhaust
- Kit
Seller:tony-howard Details:
$35.00
| 5/8/2008
| Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!
Posts: 793
Joined: 2/12/2002 From: Richmond Hill,
ON, CANADA Status: offline
Hello everyone,
The first three pictures are of the Solo prop and hub I got for Christmas. Those are 16" blades. The Corsair is the .60-size H9 Corsair (1/8 scale). The Solo prop and hub looks really cool and changing the pitch is a quick and easy task. How does it look?
The next three pictures are of some full size Corsairs. I tried to choose pictures of approximately the same angles for comparison.
As good as the Solo prop and hub looks, I personally think it is too big for a 1/8 scale Corsair, such as this H9. It is more suitable for 1/6 scale and up. Dismayed that I can't use such a good looking functional prop, I started thinking how I can make it work.
I ended up reverse engineering the original Solo Hub (using AutoCAD). Then I shrunk the design as close as possible to 1/8 scale. I made sure to keep the important dimensions in areas of high stress, such as the blade saddles. The result is in last picture. On the right is the larger original Solo Hub. On the left is the smaller 1/8 scale clone. What do you think?
The 1/8 clone will still use stock, unmodified Solo props (not drawn). Also required from Solo will be their extension nut (not shown). The spinner will be a 1-1/4" Tru-Turn hub. With the smaller package, there was not enough space for the pitch adjustment dial used in the original Solo design. It will be a little more work (not a lot more work) to change the pitch, but like the Solo design, the pitch of all three blades are automatically synchronized. I thought that this feature is an important one to keep.
Here's one catch: It is designed specifically for the RCV SP type engines. The 60SP may be too small, but for sure the 90SP and the 120SP. The reason for this is because Solo doesn't offer prop blades less then 16" diameter. That and the fact that I am only going to clone the 3-blade hub, the only two engines I know of that can turn a 16" 3-blade prop for a 1/8 scale airplane are the RCV 90SP and 120 SP. If you can prove otherwise, I'll make the necessary design changes.
Here's another catch: The CNC costs. I simply cannot justify the cost of a one-off hub for myself. If there is enough interest, we can all split the CNC costs. I'm not asking for money now. I'm asking for replies showing STRONG interest. From the response, I'll propose a $/hub figure that we can all vote on. Then I'll order the appropriate number for a production run, paying out of my own wallet. Then I'll sell them, and ask for money individually when I'm ready to ship each individual hub.
Last catch: This is one-time offer. I talked to Carl of Solo Props about the legal and ethical issues. There are actually no legal issues (as of this moment, I think). There is the ethical issue of me copying Solo Prop's design. Carl says he's okay with me doing this as long as it's a one-time, not-for-profit, not-for-business production run. Having said that, we need to have Carl on board with the project because we still need to buy his propellor blades and extension nut.
I'm sure there is a lot more that still needs to be said, but this post is long enough. If you have any questions, just post a reply.
Posts: 793
Joined: 2/12/2002 From: Richmond Hill,
ON, CANADA Status: offline
One last thing...
I am in no way affiliated with Solo Props. I started this project as a challenge to myself for my personal love of the RC airplane hobby and scale warbirds. I am not a business man and I do not intent start a business out of this. I am putting in valuable time and risking my own money. I'll try to do my best, but I can't really promise or guarantee anything.
I do not intend on stealing business away from Solo Props. A 1/8 scale hub for RCV SP engines is a very small market that they are currently not supplying. I think this project will actually give them a short term boost in prop sales. I also think this project will give Solo Props valuable market research if they ever decide to make smaller scale stuff.
All that being said, if what I'm doing is illegal or infringes patents or copyright laws, even if it alienates Solo Prop in any way... I'll stop the project.
Posts: 2117
Joined: 12/6/2003 From: Northridge,
CA, USA Status: offline
Since Carl at Soloprops seems to have the equipment necessary for his hubs, do you think he might be interested in producing your reduced version? This would eliminate any ethical questions and I would guess the product would be priced at about what he charges for his hub.
Either way, I do have a 60 size Royal corsair kit, and it would go well with the 120SP. I would be interested in a 1/8 version of the hub.
The only other possible alternative to the RCV SPs would be electric. I'll be exploring this with my current Top Flite P-51B build.
Posts: 793
Joined: 2/12/2002 From: Richmond Hill,
ON, CANADA Status: offline
quote:
Since Carl at Soloprops seems to have the equipment necessary for his hubs, do you think he might be interested in producing your reduced version?
Scott... That possibility came up when I talked to Carl. He basically said that he doesn't have enough time to get into something new, and that it would require too much setup time. I'm sure he's watching very closely how this project goes. I'm currently waiting for a quote from one CNC house. They said they'll have numbers for me next week. I'm also looking for other CNC companies for additional quotes.
I haven't even thought of electrics! More to research and think about...
Posts: 793
Joined: 2/12/2002 From: Richmond Hill,
ON, CANADA Status: offline
I'm still waiting for some quotes to come in from a couple CNC shops. In the mean time I played around with the CAD drawings. For thoroughness, in the original sized Soloprop hub, I added the bolt holes (previously missing). Also in the original sized Soloprop hub, I added the required space between the back half an the front half (previously drawn together).
In each picture the middle hub has 4 bolts per side. It'll be more scale with 4 bolts, but it may look a little too crowded in the 1/8th version. Which do you prefer?
In the last picture, I put the hubs in front of 1/8 scale Corsair shaped cowls. In the 1/8 hubs, the prop root saddles are a little wider and protrude a little further than scale, but otherwise it looks just the right size.
Posts: 2117
Joined: 12/6/2003 From: Northridge,
CA, USA Status: offline
I guess the big question is, are 2 bolts enough to secure the props, or will 4 bolts add enough extra insurance against failure to justify the cost. Based on looks, I like the 4 bolt. I may like it for peace of mind too.
Posts: 81
Joined: 9/8/2006 From: Clovis,
CA, USA Status: offline
Hello Juice !!..
What a great idea you have there, and I to would be interested in getting your hub. My first Warbird was a Hanger-9 Corrsair. started bashing it rite off the bat. I also got the Solo prop thinking it would be perfect for it. But after getting it, I knew rite away the hub was out of scale. I'm putting the OS-FT-160 flat twin in it, and am going to fly it with a 18in. diameter prop. Also being so big for the Carrsair it was a little to much rotating mass. So I put the solo on the shelf for a while. Waiting for something else to come up, (Like Now !!! )Sweet.... Anyways I found a metter match for the Solo. My !/5th scale P-40
I want to see someone remake some blades for the VarioPROP design. Seen here
I own one, and the hub is the rite scale and the prop blade base isnt so thick either. They make hubs for gas and glow 2,3,4,5 blade assy's But the downfall is there biggesr diameter is a 14, and the profile is more like a Spitfire and not a Corrsair. But you could CNC some different molds with the correct profile (shape) and legnth.. would be sweet..
< Message edited by 77chickenhawk -- 1/23/2008 4:52:36 PM >
Posts: 793
Joined: 2/12/2002 From: Richmond Hill,
ON, CANADA Status: offline
It's unanimous then... we'll go with 4 bolts.
I had a look at the VarioPROP design. It is much better suited for smaller glow and electric engines. The Soloprop design is more suited for gas and larger glow engines. Because I'm targetting a mid-size glow engine, the Soloprop design would be a better start. I think it would be more risky to start with the smaller VarioPROP hub and use a larger prop than it was originally designed for. It's less risky to start with the larger Soloprop design and shrink it (keeping important structural dimensions).
It's interesting that both designs are VERY similar. It looks like they both use the same technique to synchronize the pitch of each hub. The larger Soloprop design uses a dial to set the pitch (a really slick feature). The small VarioPROP design uses some kind of screw to set the pitch. Small difference, but essentially the same.
Posts: 252
Joined: 9/28/2004 From: Monroe,
WA, USA Status: offline
Josh
I'm interested in this project for a Brian Taylor glass Hellcat that I have stored away. It would be a perfect fit. My current thinking is electric power. I have other applications that it would fit as well.
Posts: 847
Joined: 3/1/2006 From: Alexander City,
AL, USA Status: offline
I can tell you that a machine shop is going to want an arm and a leg to do a small number of hubs unless it is a small shop. I might be interested in it if the price is right. I am putting my H9 Corsair together now with a RCV 90SP.
Printable Version
All Forums >> RC Airplanes >> RC Warbirds and Warplanes >> 1/8 scale functional Hamilton Standard hub for RCV SP engines. 
1/8 scale functional Hamilton Standard hub for RCV SP e... - 
