JJPs51D

Im getting ready to put together my P51 Miss America with the 1.0 4 stroke and wanted to use a 4 blade prop. Could somebody clue me in to a company the makes them ?

Thanks

Wayne22

My Feedback: (2)

http://www.zingerpropeller.com/4_bladed_propeller.htm

Good luck. There is a strong faction that does not support the use of multiblade props, but a warbird with a 2 blade prop looks so wrong!!!!!

JJPs51D

Nony !! Thanks , thats just what Im looking for ! Unless convinced otherwise I will not have anything less than a 4 blade on this bird. The only thing that will keep me from doing it will be if it makes it un-airworthy

Im realatively new to the sport, so what the big deal about running the 4 blades?

Richard L.

My Feedback: (24)

Because a 4-blade just looks too puny on this size of a plane. Scale is 19" in diameter. Plus, you will lose quite a bit of efficiency and speed when going to a 4-blade. Try a 4-blade, and you will know what I mean. Ever notice why most people don't use multi-blade props on rc models?

TLH101

My Feedback: (90)

Yes a 2 blade prop on a Mustang does look silly, but no worse than a 4 blade in a size that will work with your motor. You will only be able use a 13" or maybe 14" dia. prop.

Richard L.

My Feedback: (24)

For the Saito 100, it will be a 13x6 4 blade. Note the 13" diameter and the low 6" pitch (no speed).

SCALECRAFT

My Feedback: (13)

Hi All

I am determined to fly my 80" span Bf109G with a muti blade scale looking prop. The model will fly with a 1.08 and a two blade with more than enough power.

But with a 19 .5" scale 3 blade I made, I'm going to put a Moki/ D Patrick 2.10 into the model. Don't need a fast model just smooth flight.

Also in a P-51 the scale baldes have a very large diameter and unfortunatley, for modeling have four . I would get a blade shape that looks more scale but with a slightly smaller diameter and a larger engine.

Steve

saramos

You might want to look at the RCV 120SP. The recommended prop for this engine is an APC 15.5 x 12 4 blade. It may be possible to turn a Zinger 18 x 10 4 blade. I will be using a 15.5 x 12 4 blade on my 1/7 scale Spitfire powered by an RCV 90SP.

Scott

Wayne22

My Feedback: (2)

Bolly has written an everything-you-need-to-know-about-propellers section on their website.. It is interesting reading, and there is a section on multibladed props.....

http://www.bolly.com.au/book/Book.js...er=2&Section=2

Square Nozzle

My Feedback: (1)

Saramos, how do you plan to get cooling into the Spit engine? I see a small gap behind the spinner. I have an RCV 90SP on my P6E turning a Master Air Screw 16 X 13, 3 blade. The engine has the torque to turn the prop but I too have been advised about loss of performance. But the RCV has so much power that I can't believe that the power loss will be a show stopper

saramos

John,

The cowl is still in a prestine state. I have not yet cut openings for cooling. It looks like I'll have to do a small opening on the side of the cowl to clear the throttle linkage on the carb too. I'm just delaying doing the cutting 'till the plane is glassed and primed. I wish I could come up with a way of providing the cooling without too much cutting. Well, at least there won't be engine pieces hanging out all over.
I have a question about your P6E. What is your total weight? My spit will probably be between 9 and 10 lbs.

Scott

JJPs51D

Thanks to everyone for the info!
I also talked to my local RC "master " who also explained to me that the ins and out of this choice. One thing I forgot was the "real" P51s have a variable pitch prop as the model does not. He did say that there is a company out there that DOES make real working scale versions of the variable pitch props. This is worth looking into.
So as it stands the current plan is to run a standard prop for flying and a nice 4 blade for static display.

Square Nozzle

My Feedback: (1)

I'm really not at a point where I can get an accurate weight but I have been corresponding with someone that has the same kit. He's not using an RCV but the weight of his P6E is 9 1/2 pounds. When all is completed I should be in that same weight range. Having run the RCV on a test stand, I have no issues with having enough power. I used a 18 X 12 prop during break in and there was lots of air being moved behind that engine.

Dig it

Could a guy turn a APC 15.5 x 12 4 blade with a Saito 100?

Richard L.

My Feedback: (24)

Not in this life time. The Saito 100 swings a 14x8 2-blade prop, so there is no way it will be able to swing a 15.5 x 12 4-blade. In fact, the Saito 180 can't even do it.

SCALECRAFT

My Feedback: (13)

Hi All


I tried to run my scale 19 " 3 blade with a RCV 120. It did turn it to about 3500 rpm. Not enough to fly anything.

According to the owners manual and the web site, the RCV 120 has 1.89 hp 2:1 reduction. The model should weight no more than 11lbs.

I was hoping for a bit more weight on the model, but again these are recomendations only.

A two stroke RCV might be something to consider one day

steve

Dig it

lol, three blade it is.

mgruenba

I have exactly the same plane as you are building. Great Choice. She flies beautifully. I put a Saito 100 in mine. I am using a Master Airscrew 14 x 8 2-blade prop. I strongly discourage putting in a 4 blade prop for the simple reason that it decreases effiency dramatically. Good Luck.
Enjoy Flying her. I have had 7 flights with mine. She has been flying for 6 weeks now.

One Recommendation: Replace the retracts.

airsteve172

As a big fan of Mustangs, I have to feel sorry for those who embark on a P-51 project. Unlike other aircraft, a major portion of the Mustang's allure it seems is that huge prop on a sleek body. The proportions are just visual magic in terms of a good looking aircraft and unfortunately it's also one of the hardest factors to accomplish on a flying model. All sorts of lavish details on the plane are fine, but without the proprtions of the prop, they are a total waste, much like the luxury of the Titanic was when it couldn't float. I think I'd appreciate a P-51 model more if the plane looked as crude as paper mache having accurate proportions and the right size prop rather than all the detail that would make it indistinguishable from the real thing and sporting a popsicle stick on its nose.

No, it's not easy to accomplish. If it was, I'd do it myself []

grbaker

My Feedback: (29)

The problem is not that some guys support multiblades and others don't. Some have the experience to know that multiblade props are not always practical. I have a 1/5 scale P-39 Airacobra with a 3W60 on it. I had to experiment with different 3 blade prop configurations until I found one that would work. At $75 for a set of blades, it got pretty expensive. Now I am thinking about refurbishing this airframe and the prop I used is no longer in production. I have to start all over again. I will go with another 3 blade prop on this one. But my Byron Mustang will have to stay with the 2 blade. If a Mustang model doesn't fly like a Mustang, then I don't care how good it looks on the ground!

The Ghost

Check out [link]http://www.rcuniverse.com/forum/m_3136830/tm.htm[/link]

Cheers.

Richard L.

My Feedback: (24)

That's how I feel also. I want my Mustang to fly with authority and not put around the sky like a piper cub

Flak

My Feedback: (1)

I recommend to the engine mfgr's to check into this dilema and come up with an engine that will turn what ever prop is put on it. I use 3 blade props all the time with no problems. I will be getting into the 4 blade issue on my Pica 1/5th Mustang.

"Keep 'Em Flying!"
Flak

John Cole

My Feedback: (4)

The problem is that our model engines have a power band that is too fast for scale sized props. The not-so-easy answer is gear (or belt) reduction, just as the full sized P-51 used. One compromise would be to over-size your engine, and turn a large diameter two blade. With the prop painted accordingly, it would have a good effect in flight, and the model would perform well.

John