rickburnout666

Hi i need some more pitch on my triple blade i have a 10 x 7 at the moment, can anyone tell me if i can get a 10 x 8 ,10 x 9, or any others , and where from? links would be great.
Thanx Rick

rickburnout666

sorry i forgot to say i`m running a .61 super tigre

bruce88123

You might try here:
http://www.radiocontrolmodels.co.uk/...s_frameset.htm
Can you buy from the U.S.?

DO you have a particular reason for a 3-blade prop? They are less efficient than a 2-blade.

red head

Here in the States I go through www Hobby- Lobby .com. to get GRAUPNER 3 bladed props. They are German made so you should be able to get them over there some place. Try a search for Graupner and see what happens.

Now I'll ask the same question as bruce 88123. Why a 3 bladed prop ??? Like he said the 2 bladed is more efficient.

ENJOY !!! RED

bruce88123

I was leading up to the graupners from www.hobby-lobby.com

rickburnout666

Thanx , I am using a graupner prop now , I will check the links to see if i can find a prop i can use.
I want 3 blades for the look, thats my reason

carrellh

Graupner does make a 10x8.3
http://www.hobby-lobby.com/grprop.htm#3%20Blade

rickburnout666

Thanx, that saved me some time [sm=thumbs_up.gif] ,and i will be ordering a couple very soon

KidVermin

My Feedback: (3)

http://www2.towerhobbies.com/cgi-bin...5&P=0&C=QBCMAS

Too small of diameter. I'm running an Enya 60 and Thunder Tiger 61 with 11x7 and 11x8 MAS. Just as much pull as when I
was using 2 blades if you test the correct dia. and pitch.

jetmech05

general rule for 3 blade prop size:: 12X8 2 blade becomes an 11X9 three blade.
in other words for about the same performance decrease diameter one size increase pitch one degree.
with that said I agree with Husker Boy, too small a prop for a .61...... smallest i'd go is 11X7

carrellh

When I had a Thunder Tiger 61 on my trainer, a 12x6 two blade performed well.
The 'load factor' in ThrustHP for a 12x6 two blade is 124416
The 'load factor' for a 10x8.3 three blade is 124500
In theory the engine should turn pretty close to the same rpm with either prop.
Using the numbrs from ThrustHP, you do lose almost 3 pounds of static thrust by going to the small diameter three blade prop.

rickburnout666

carrellh, so how does my 10 x 7 Triple compare to the 12x6 double`s, load factor and static thrust ??

RCKen

My Feedback: (9)

rickburnout666,
Use ThrustHP to compare how the different props compare with each other. This is a great little program for playing these "what if" comparisons.

[link=http://www.infinityok.com/review/thrusthp.zip]Thrust HP[/link]

Hope this helps

Ken

TopThumbs

Why use a three blade in place of a two blade prop?
well... ground clearance can be one reason.

I flew a Ace sport T-34 for years but I had a OS 70 in it and the 2 blade prop wouldnt clear the ground so I went to a three blade.
talk about torque! it looked neato too

Bill

rickburnout666

Ken, The Thrust Hp link does not appear to work or is it just my PC ?

jaka

Hi!
If you switch to 3-blade(which isn't good due to it being inferior performance wise to a 2 blade) from a let say a 12x6 2 blade then you choose a 11x6-blade. Go down one size in diameter and keep the pitch.
A 12x6 APC or RAM is a good 2 blade prop to start with for most high and low winged sport airplanes. Can't understand why you want an inferior prop on your plane??[X(]

rickburnout666

It might not be good due to inferior performance , but its what i want for my build, just for looks,as I said in an earlier post, and then you would understand why I want an inferior prop on my build?? so i need to know the best 10" prop with what pitch would give the best power/thrust ???

carrellh

The link in Ken's post is to a zip file that you need to download, unzip, and install.

Here's another site with a download link. Most likely this one is the same.
http://www.hoppenbrouwer-home.nl/ika...rusthpv20d.htm

The variety of three blade props is small. The 10x8.3 is the highest pitch I was able to find in a 10 inch diameter.

rickburnout666

Thanx Carrellh, I hope i can find out what i need as i`m more of a beginner at PC`s than plane engines , I will let you know how i get on

carrellh

Find a neighborhood teenager and ask him/her to download and install it. It only takes a couple of minutes, and many in the younger generation are very good on computers.

rickburnout666

My 15 year old daughter usualy sorts out my PC problems/programes , but she is in Scotland until the Friday so i will have to wait.
Thanx again, Rick

jaka

Hi!
Well, on a .61 two stroke using a standard silencer, a 10x8 or 10x9 would be my choice. Even a 10x10 APC could be used. But remember that these props will not be as good as a 12x6 or 13x5 APC two blade.
I don't even know if APC makes those sizes and MA props or Graupner grey one's aren't that good.

3-blade props could be as good as 2-blade props but then you have to make them your self in carbon fiber (see picture)