RE: 1/8 scale functional Hamilton Standard hub for RCV SP engines.  
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RE: 1/8 scale functional Hamilton Standard hub f... - 5/16/2008 5:57:19 PM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		snurckle... I have a different sum. I checked, double checked and triple checked.

Everything, minus stuff from Soloprop, minus shipping:
- 1, rear hub half , $87.60 (USD)
- 1, front hub half, $87.60 (USD)
- 1, actuator, $40 (CAD)
- 12, 6-32 x 3/8" SHCS, $2.78 (CAD)
- 1, 1-1/4" Tru-Turn hub, $17 from me (CAD)
- 1, 8-32 SHCS, $0
Total: $234.98

I say we make $1 USD = $1 CAD to make things simpler.

I will be sending each of you a bill in a couple days. Those who wish to pre-pay, or put down a deposit, are welcome to do so (my bank account will thank you).

Josh

(in reply to snurckle)
       Post #: 176

RE: 1/8 scale functional Hamilton Standard hub f... - 5/16/2008 7:19:35 PM   
Joe Lott


 

Posts: 40
Joined: 12/13/2007
From: Killen, AL, USA
Status: offline 		PM sent!

(in reply to Juice)
       Post #: 177

RE: 1/8 scale functional Hamilton Standard hub f... - 5/16/2008 7:54:36 PM   
snurckle


 

Posts: 84
Joined: 4/30/2008
From: New Bern, NC, USA
Status: offline
quote:

ORIGINAL: Juice

snurckle... I have a different sum. I checked, double checked and triple checked.

Everything, minus stuff from Soloprop, minus shipping:
- 1, rear hub half , $87.60 (USD)
- 1, front hub half, $87.60 (USD)
- 1, actuator, $40 (CAD)
- 12, 6-32 x 3/8" SHCS, $2.78 (CAD)
- 1, 1-1/4" Tru-Turn hub, $17 from me (CAD)
- 1, 8-32 SHCS, $0
Total: $234.98

I say we make $1 USD = $1 CAD to make things simpler.

I will be sending each of you a bill in a couple days. Those who wish to pre-pay, or put down a deposit, are welcome to do so (my bank account will thank you).

Josh

You put :
12, 6-32x3/8" SHCS, $2.78

I understood that as....12x2.78

I see the error, and I miscalculated.

(in reply to Juice)
       Post #: 178

RE: 1/8 scale functional Hamilton Standard hub ... - 5/21/2008 10:58:29 PM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		Soloprops needs 2 to 3 weeks of lead time to have your props ready to ship. This also happens to be the lead time given to me my the CNC shop. It would be nice if the two shipments arrive at the same time.

So Carl (from Soloprops) and I are setting a cutoff date on Sunday, May 26, 2008 to place your orders for props and the extension nut/washer.

If you place your Soloprop order on or before the cut-off date, you shipment will be combined with the rest to save a little money on shipping. Your Soloprop order will be re-packed with my hub and shipped together to your door. One shipping charge.

If you place your Soloprop order after the cut-off date, it's not the end of the world. Carl with ship your order directly to you. The hub will be in another shipment. Two shipping charges.

I know several of you have already placed your order with Soloprop. Carl says he really appreciates the early notice.

Josh

< Message edited by Juice -- 5/21/2008 11:02:00 PM >

(in reply to snurckle)
       Post #: 179

RE: 1/8 scale functional Hamilton Standard hub ... - 5/30/2008 12:39:19 AM   
Juice



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

It's been a week since the last post and I just want to give an update on the state of things here.

The production of the hubs has been delayed. The reason is mainly because of my own lack of experinece with CNC and machining parts in general.

The design changes I made to the prototype design are due to manufacturing tolerances and the fit of all the other components that comes in contact with the hub. On the prototype, it was a tight fit when the prop blades were sandwiched between the hub halves. It's a little looser fit on the Soloprop hubs. So for the production design, I increased (only by a hair) the diameter of the interior surface of the hub (the surfaces holding the prop blades) and I specified a tighter tolerance. Apparently, this change required the CNC shop to order a new set of custom made guages, and this is what is causing the delays. Had I known it would cause delays, I would not have made that change. A tight fit on the props is not a bad thing.

Anyways, it's too late to change the design again so we have to live with the delay. The CNC shop owner says everything else is okay and ready (including a tripod and camera to film the machining of one part).

Josh

(in reply to Juice)
       Post #: 180

RE: 1/8 scale functional Hamilton Standard hub ... - 5/30/2008 1:30:41 AM   
snurckle


 

Posts: 84
Joined: 4/30/2008
From: New Bern, NC, USA
Status: offline 		Juice - sounds good...take your time, I'm in no hurry...I figure - as long as I have it by September...I'm happy.

(in reply to Juice)
       Post #: 181

RE: 1/8 scale functional Hamilton Standard hub ... - 6/4/2008 7:53:39 PM   
p-40_lova



Posts: 264
Joined: 5/11/2003
From: STROUDSBURG , PA, USA
Status: offline 		Juice,

Looks fantastic!
I have an RCV 120 sp with a zinger 3 blade. The hub is flat aluminum. With the high torque of the RCV, I have a hard time keeping the prop/prob hub and spinner from shifting. I've used drywall sandpaper, cut into washers, to mesh between the connections and that seemed to help a bit but I still have the problem. I was wondering if you have any issues like this seeing your hub is smooth aluminum and its connecting to the semi-smooth aluminum surface of the RCV.
I'm looking into using carbon steel interior/exterior teeth combo lock washers.


Thanks!

Doug

< Message edited by p-40_lova -- 6/4/2008 7:55:58 PM >

(in reply to Juice)
       Post #: 182

RE: 1/8 scale functional Hamilton Standard hub ... - 6/4/2008 8:48:33 PM   
Juice



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

That concerned me during the design phase. The design is based heavily on the Soloprop hub design, including the smooth aluminum surface in contact with the engine's drive plate. I haven't read any of this issue with Soloprop, so I thought it should be okay. As it turns out, in the actual test runs and test flight, it was not an issue.

The extension bolt (from Soloprop) is made from plated steel and is very heafty. It's purpose is to tighten down the entire hub/prop assembly against the engine's drive plate. It is tighted with a torque wrench set to 15 lb-ft (specified by Soloprop). When it's that tight, nothing is going nowhere.

The extension bolt are shown on the top left of the attached photo (one full length from Soloprop, one cut down to fit the hub).

I hope this helps.

Josh

Attachments
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(in reply to p-40_lova)
       Post #: 183

RE: 1/8 scale functional Hamilton Standard hub ... - 6/4/2008 9:25:57 PM   
p-40_lova



Posts: 264
Joined: 5/11/2003
From: STROUDSBURG , PA, USA
Status: offline 		Hey Josh,

Glad to hear you don't have that issue. It doesnt help that Im sandwiching multiple layers either (hub and spinner).

Thanks for the replay and keep us updated!

Doug

(in reply to Juice)
       Post #: 184

RE: 1/8 scale functional Hamilton Standard hub ... - 6/6/2008 12:48:30 AM   
Juice



Posts: 843
Joined: 2/12/2002
From: Richmond Hill, ON, CANADA
Status: offline 		Another week has gone by and it's time for an update...

- The CNC shop says the raw aluminum for the front and rear hub halves have been cut to size. He'll start machining them today or tommorow.

- I was in the area of the local machinist who is making the actuators, so I stopped for a visit to see how it's going. I snapped a picture of his progress with the actuators (with a crappy cell phone camera). On the front right is the prototype actuator, which he is using as reference to machine the others (which are still round at this stage). On the front left is one with the tap still in it.

- A few people have stepped up and voluntarily put down a deposit on their hub. They pre-paid for everything, minus the final shipping costs (which is still unknown). I've already paid the up-front costs for 15 hubs, but my credit card is a little bloated. I was prepared to pay the up-front costs for the origina 5 hub orders. I will have to perform some financial juggling for 15 hubs (which isn't a problem, but I would prefer to minimize it). Are there any other people willing to put down a deposit for their hub? If so, send me a Private Message. It would be very greatly appreciated.

Josh

Attachments
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(in reply to p-40_lova)
       Post #: 185

RE: 1/8 scale functional Hamilton Standard hub ... - 6/10/2008 7:04:49 PM   
tony-howard


 

Posts: 273
Joined: 9/28/2004
From: Monroe, WA, USA
Status: offline 		Hi Josh

How many flights do you have on the hub? Everything still OK?

_____________________________

Tony
pacific-scaled-aircraft.com

(in reply to Juice)
       Post #: 186

RE: 1/8 scale functional Hamilton Standard hub ... - 6/10/2008 9:52:24 PM   
Juice



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

Still just one flight. You're probably wondering about MTBF (mean time between failure), right?

I would have liked to fly it more, but there are a few unrelated things that have prevented me from doing more test flights (in order of importance):

1) The mechanical rotating landing gear from H9... Remember the landing of that test flight? The hub/props are too expensive for that to happen again on an unreliable set of retracts. I have ordered and am waiting for the new set of LADO electric retracts to come in. From what I've read, they've already started shipping, so hopefully I'll have a new set of reliable landing gears soon.

2) The actuator... The one and only actuator prototype is at the machinists shop. It's very easy to get the cuts and orientation wrong, so the machinist want to prototype as a reference as he's machining all the others. He should be finished this week, so I'll have my actuator back soon.

3) The weather has been aweful. This is the worst summer since I started flying RC. Mainly it's been abnormally cold and windy to even think of flying. Real summer weather is actually here now, finally. So this excuse doesn't apply anymore. =)

4) The lease of my club's field expired. That's normally not a problem, in previous years we just sign a new lease. But this year, the landowner sold the property without telling us. And the new landowners don't want us to fly until a completely new lease is in place. They don't seem to be in a rush to get it done, as a result our club has been field-less for about a month now. If not for the bad weather, our club members would have rioted long ago. Our alternative is to fly as guests at neighboring clubs fields.

I'm confident the hub will perform well. I have run the engine again after that test flight (with one nose-over and a hard flip-over landing) and there is no sign of anything failing. I'll make sure to give detailed flight reports... when all the above issues are resolved (soon).

Josh

(in reply to tony-howard)
       Post #: 187

RE: 1/8 scale functional Hamilton Standard hub f... - 6/10/2008 10:59:41 PM   
snurckle


 

Posts: 84
Joined: 4/30/2008
From: New Bern, NC, USA
Status: offline 		Juice-
Any chance you could send invoices via paypal? I know it's possible, and fairly simple to do. Also, gives you an easy way to track who has paid, and who hasn't. Not sure if we can make partial payments vice full payments, but probably something to look in to.

Let's face it - it's not that I don't trust you, but the buyer and seller protection offered through Paypal is something one should take advantage of, given the opportunity. If I just make a payment to you, there is nothing for paypal to bounce that off of as an agreement between parties. If you send invoices out, which is a bill listing parts promised, then paypal should protect it based on an agreement between buyer and seller.

Think about it, and I've sent you a PM with my email address in it, so you can add it to the block on the invoice in paypal.

Thanks
john

(in reply to Juice)
       Post #: 188

RE: 1/8 scale functional Hamilton Standard hub ... - 6/10/2008 11:16:28 PM