Adonis

Josh thanks for all of your work on this project, from your design work to your meticulous testing to make sure it runs perfect. I’m very excited to get this thing mounted on a very scale Corsair, a Royal/Marutaka of course! Like I said it makes me want to cut the engine mounts off of my current Corsair! I thought it looked good in the air as it is, but with that prop it is going to look awesome!

HellcatAce

My Feedback: (6)

IT"S ALIVE!!!! Great work Josh! Guess I gotta go buy an RCV now!

Just to clarify, was that test with a 90 SP or the 120SP?

Juice

Ace... That was with a 90SP.

I'll be doing more tests this weekend to get some RPM numbers for common diameter/pitch settings.

Josh

Juice

RPM Test #1

[I don't trust my results. They were too good to be true. I'll post RPM numbers again on a later date.]

grinder-RCU

My Feedback: (1)

Looking good Juice. The 90 has lots of torque to swing that big 3 blader around. Maybe the bigger prop ( more mass ) is having a greater flywheel effect making those rpm's possible. On the 90sp the max rpm is 5500 is it not?. I would think you would do most flying around about half throttle with the 90sp and H9 corsair. Can't wait to get that 3 blade hub on my son's Corsair and try her out. Keep up the good work. So all I need to order from Solo is the 3 blades, extension nut. With the blades being flat black not glossy. Did you ask for the scale profile blades?.

Joe.

Joe Lott

Wow! I was preparing to buy a 120SP. Now I'm going to have to rethink that move. One question, Josh. Does your tach have a button or switch to go from 2 blade readings to 3 blade readings? If you were reading for a 2 blade prop with a 3 blade attached, that would explain the high RPM. I know that's a dumb question but I had to ask.

Juice

Joe...

I'm glad you asked, because I think that's what happened (measuring RPM of 3 blades on 2 blade setting). It was cold, and it was drizzling rain very lightly at times, and I was rushing to beat the sunset. In the rush, I probably just forgot to set the tach to 3-blades. You know, the simplest explainations make the most sense.

I feel like a bonehead right now. []

Josh

Juice

Joe...

Props and an extension nut. Yes, that's what you'll need from Soloprops.

They have two order forms.

1) From the one titled "Solo Props Secure Order Form", you'll order three or more "Round Tip Blades". I still have to do RPM tests to determine if 16" or 18" blades are best. In the comments section near the bottom, you should specify "Flat black. Corsair round tips".

2) From the one titled "Solo Props Replacement Part Order Form (Secure)", you'll order Part Number 45624 (Extension Nut & Washer, 5/16"x24). Later he'll combine the two orders and charge for shipping only once.

I have an idea to save everyone some money in shipping charges. Everyone places their own orders for props and extension nuts with Soloprops... and pays for it. Carl with then combine all the orders into one shipment sent to me. I'll pay for the shipping charges and divide the cost by the number of people involved and add it to your bill. Then I'll re-pack your props and extension nut along with my hub and a Tru-Turn dome spinner and ship you everything. This way everyone only pays for shipping once. And that one shipment to you will contain the complete prop/hub system, ready to assemble and mount. Does that make sense?

I gave Carl from Soloprops a heads up about your orders and this shipping idea. He said it won't be a problem on his side. Everyone: If you want to combine all your shipments, please respone to the thread with "YAY". Otherwise, say "NAY".

Josh

grinder-RCU

My Feedback: (1)

"YAY"

Adonis

"YAY"

That prop is all I need to complete these pictures!

Joe Lott

Yay. I'm in.

tony-howard

My Feedback: (224)

A YAY from me too.

ed_mustafa

yay here too!

Skaweee

My Feedback: (11)

Can I climb aboard too? Just stumbled across this thread. I had contacted the folks at Solo-Prop about two weeks ago to ask about a 1/8th scale prop hub, they said not at this time. This seems too good to be true!

Juice

Skaweee... You are welcome to join. I can still add to the order, but only for a short while longer. Read over the thread and keep an eye one the details such as cost, weight and approprite engines.

Josh

Juice

RPM Test #2

Engine: RCV 90SP
Fuel: Red Max 10% nitro, 7% caster, 14% total oil content.

1) MAS 18x12x2 5280 RPM
2) APC 15.75x13x3, 5300 RPM
3) 1/8 Hub 18x13x3, 3840 RPM
4) 1/8 Hub 18x11x3, 4400 RPM
5) 1/8 Hub 18x10x3, 4450 RPM
6) 1/8 Hub 16x13x3, 4760 RPM
7) 1/8 Hub 16x12x3, 4960 RPM
8) 1/8 Hub 16x11x3, 5200 RPM

The extra 4 oz of the hub does have an negative effect on max RPM. And I had hoped that I can fly with the 18" props. But from these RPM numbers the 90SP doesn't have enough to spin it above 5000 RPM.

It looks like I'll be flying with the 16" blades set to 11" pitch. I hope to make the flight on either Thursday night or sometime next weekend.

I may also buy different fuel next time also. I actually don't like the Red Max fuel I used for this RPM test, because both of my RCV engines could never idle well with it. I had been using a special fuel mix prepared by a gentleman named Otto Kudrna, who used to be the RCV Customer Service rep for North America a couple years ago (I can't find him anywhere now). His fuel was the best. I still have a few quarts of the RedMax fuel, but I don't feel comfortable flying with it.

Josh

Josh

Rocketman612

My Feedback: (85)

Josh,

I'm in

Also consider Cool Power 15% 4Stroke. That's what I've been using with no problem.

My fuel from Otto didn't store well and gave me fits and had to dump it[&o]


Pete

tony-howard

My Feedback: (224)

Josh

I'm thinking it would be interesting if you could do some thrust comparisions at some point between your normal 2 bladed prop and the new 3 blade.

Juice

Tony... I did a search on how to measure thrust. This is what I found:
[link=http://www.rcuniverse.com/forum/fb.asp?m=3630199]How do I measure static thrust[/link]
All I need is a fish scale.

I can do it if everyone really thinks it will be useful data. I think a test flight will be a better indication of it's performance.

Josh

rt3232

My Feedback: (6)

Josh

Maybe a test flight first then just some # from a digital scale and let every one do there own calc's

Bob T

snurckle

I just ordered a TF Corsair, and it should be delivered by early next week. I planned on spacing the build over a 6 month period, and have been debating on engines. Having read this thread, I'm very curious about this hub. Will it be possible to purchase one of these hubs in like 3 months, or is this a one shot deal - so I better jump on this band wagon now, even though I won't be ready for it for another 4-6 months, and - is it too late to put my hands on one?

Juice

snurckle... It's not to late if you get one now. It is a one shot deal, so you basically have to decide in a week or two. Another thing to think about it your engine choice. The only two engines (that you'd put on a 1/8 scale airplane) that can turn this prop are the RCV 90SP and the RCV 120SP. Go to the [link=http://www.rcvengines.com]RCV Engines website[/link] for more info on those engines. The Zenoah 20cc is not going to be able to turn this hub.

Let me know soon if you still want one.

Josh

snurckle

Juice -

Thank God for Tax Rebate checks....put me down for one, and tell me where to send the money. I definately want one, and the money isn't a problem. 235$ for this, and let me know if I need to send for the props. Also, my old man (dad) is going to be buying a CNC machine, and if he has the g files, can reproduce. I started looking at alternatives, but he won't have it until X-mas.....

Yes, I want one, and I've decided on the RCV 120.

Juice

snurckle... Welcome aboard. I'm very interested to see how fast the RCV 120 can spin the 18" blades.

Skaweee

My Feedback: (11)

Hi Juice, count me in as well. Let me know how much you want including shipping, how you want payment made (PayPal maybe?), and where to send. Thanks for all your work!

Ken