Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Prop for 46 ax for some speed

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Old 07-24-2007, 04:19 PM
  #1  
manyu
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Default Prop for 46 ax for some speed

Hi guys..

I have an ultra sports 40 plus with a 46 Ax currently swinging a 11x6. I wanted to extract the most speed out of the combo and have two props available 10x7 and 9x7 at lhs.

Wanted to know which one will be better. i have an iclination towards the 9x7 but doubt if it will takeoff ? dont know will it?

And also should i remove the baffle to gain some rpms?

manyu baweja
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Old 07-24-2007, 04:33 PM
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daven
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Default RE: Prop for 46 ax for some speed

Remove the baffle.

Try both the 10x7 and the 9x7. The 9x7 should be slightly faster, but you may enjoy the flying characterics of the 10x7.

My suggestions are based on using APC props.
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Old 07-24-2007, 06:51 PM
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Default RE: Prop for 46 ax for some speed

ORIGINAL: daven

Remove the baffle.

Try both the 10x7 and the 9x7. The 9x7 should be slightly faster, but you may enjoy the flying characterics of the 10x7.

My suggestions are based on using APC props.

What he said My only little blurb to this is is to fly that prop 10/7 for 10-15 flights. Then when you go to change to another prop, you will see the difference instantly (better or worse). Changing props every couple flights may keep you confused.
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Old 07-25-2007, 08:25 AM
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manyu
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Default RE: Prop for 46 ax for some speed

I thing i forgot to mentiion that my 46 ax is got quite old and and i get 500 rpms lower now..

i hope the 10x7 wont overprop the 46 ax.
also wanted to know the rpms on the both of them.

Manyu
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Old 07-25-2007, 08:37 AM
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Default RE: Prop for 46 ax for some speed

Try one of these mufflers for an instant boost. On my 46AX I got about 800 RPM more and about 500 on the 55AX.

http://www2.towerhobbies.com/cgi-bin...?&I=LXJB16&P=Z
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Old 07-25-2007, 08:41 AM
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Default RE: Prop for 46 ax for some speed

Its pretty tough to overprop the AX.

An APC 10x7 should peak at or slightly over 14,000 rpm, not sure on the 9x7.
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Old 07-25-2007, 02:13 PM
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Default RE: Prop for 46 ax for some speed

Manyu:

Listen to Daven, he's both, knowledgable, sneaky and tretcherous, a hard combination to beat. ENJOY
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Old 07-25-2007, 09:10 PM
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Default RE: Prop for 46 ax for some speed

My personal favorite for the OS .46SF is an 8.50-7.50 or an 8.75-7.75 APC Pylon prop. I use this on a Miss Martha and can get a top speed of about 120+.

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Old 07-25-2007, 10:16 PM
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Default RE: Prop for 46 ax for some speed

the newer AX O.S. motor is different from the revving motors in the past.

Use a prop that peaks somewhere between 14-14.5 RPM and you will be in its sweet spot.
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Old 07-26-2007, 04:03 AM
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Default RE: Prop for 46 ax for some speed

Did you put retracts on yours, I had one when they first came out and it flew great at any speed BUT with the retracts air got into the wing on a high speed dive and actually blew out the covering top and bottom in the bays behind the retract. It wis like I had a M-80 in the wing but luckily it was still flying and I landed safely. I ended up losing it a few months later to a knife edge gone bad, (darn it..... the other up!!!!)

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Old 07-26-2007, 02:11 PM
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Default RE: Prop for 46 ax for some speed

Thanks alot guys... i will go ahead with the 10x7


I dont have the retracts on nor the cowl....

the cheap aweful abs cowl from gp has developed cracks from all corners...

how many m/h will i get more by putting the cowl ?

Manyu Baweja
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Old 07-26-2007, 02:47 PM
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Default RE: Prop for 46 ax for some speed


ORIGINAL: manyu


how many m/h will i get more by putting the cowl ?

Manyu Baweja
An un-cowled engine can be responsible for as much 1/3 the entire drag of your plane. A properly designed engine cowl can increase your airspeed up to 12%.
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Old 07-26-2007, 03:22 PM
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Default RE: Prop for 46 ax for some speed

May be then i will make one.... of balsa soon
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Old 07-27-2007, 02:58 PM
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Default RE: Prop for 46 ax for some speed

I got my hands on an MK 9.5x7 prop ... cant wait to get to the flying field.....

Manyu Baweja
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Old 07-27-2007, 04:46 PM
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Default RE: Prop for 46 ax for some speed

Heres my Ultra Sport...I've always ran a 11x5 on it with an O.S. .46 FX I've never played around with props trying to get speed out of this plane. I have so dam much Monokote on it it flies like a brick.
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Old 07-27-2007, 06:08 PM
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Default RE: Prop for 46 ax for some speed

Crashpro- That is beautiful!

WOW
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Old 07-27-2007, 06:20 PM
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Default RE: Prop for 46 ax for some speed

Thanks Razor.....I wish it flew as good as it looks. It was my first kit build and I really over did it with CA and epoxy and covering and everything else that made it a whole lot heavier than it should be. I only fly that one 2 or 3 times a year.
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Old 07-27-2007, 08:11 PM
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Default RE: Prop for 46 ax for some speed

MANYU; Quit pudtting around. Install robart spring air retracts. Pull off the 10 X 6 and install Jett 60 LX, take one bay out of each side of the wing, go 130 +. Blowing out the rear of a wing from retract hole is same as hole in builders head. This is why you must install a dam around the wheel well. 1/16 balsa or ply will curve around just fine and stay foreaver, epoxie fuel proof. EnJOY
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Old 07-28-2007, 12:08 AM
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Default RE: Prop for 46 ax for some speed


ORIGINAL: Blowing out the rear of a wing from retract hole is same as hole in builders head. This is why you must install a dam around the wheel well. 1/16 balsa or ply will curve around just fine and stay foreaver, epoxie fuel proof. EnJOY
Nice comment ding$&%@ Sorry if a early build does not have everything covered...OH that's right I'm shure your first build was perfect...Damn
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Old 07-28-2007, 07:39 AM
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Default RE: Prop for 46 ax for some speed

Rmenke

Then y dont you sponser me the robart spring air retracts and the Jett 60 LX.... I posted to gain the max speed of my current engine... k

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