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

Miss Martha's Speed ?

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Old 03-10-2009, 08:03 PM
  #1  
toooo_fast
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Default Miss Martha's Speed ?

I'm building a Miss Martha 40 Size With an OS .46 AX and a 9x8 Master Airscrew prop. I would like to break 130 mph with it. Has anyone tried for this speed with this plane ?
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Old 03-10-2009, 08:59 PM
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Default RE: Miss Martha's Speed ?

I would be suprised if you saw that with your airframe and no pipe on the engine personally. You might get it out of a dive...still with a pipe.
I hope it works though.

Bring it down to NC on June 28 and we will shoot it with the radar gun for you.
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Old 03-10-2009, 10:53 PM
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Default RE: Miss Martha's Speed ?

Hey toooofast beware, if it doesn't do at least 130 those guys will shoot it [X(]!
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Old 03-11-2009, 12:41 AM
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Default RE: Miss Martha's Speed ?

I do not know how realistic that is with the stock AX and 9x8 MA prop. Have you thought about an UT or Jett muffler/pipe for it? Kinda pricey but will get you some bolt-on RRR's...

I am from the APC school also since the MA props flex quite a bit-
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Old 03-11-2009, 10:31 AM
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Default RE: Miss Martha's Speed ?

Hi!
To get most out of the engine /prop size combination you have to get rid of the Master A prop in favor of an APC prop!
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Old 03-11-2009, 03:49 PM
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Default RE: Miss Martha's Speed ?

On the wing Should I use 1 servo on the alerions or two for that kind of speed ? And what kind of tuned pipe should I use on the os 46 ax ?
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Old 03-11-2009, 04:01 PM
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Default RE: Miss Martha's Speed ?

You will be fine with a single full size servo. You can go as high dollar as you want but won't see a whole lot of improvement in the long run.

Razor mentioned the Jett pipe, Pspec and Macs also make a suitable pipes. There have been a few guys who have used the Tower .46 pipe and had good results too.

I recomend you build it and fly it just as planned and pick up a pipe later if you think the 1-1.5K rpm boost will make the diffrence worthwhile.
Definately go with APC props! Your only talking a few bucks there.
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Old 03-11-2009, 04:17 PM
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Default RE: Miss Martha's Speed ?


ORIGINAL: vicman

I would be suprised if you saw that with your airframe and no pipe on the engine personally. You might get it out of a dive...still with a pipe.
I hope it works though.

Bring it down to NC on June 28 and we will shoot it with the radar gun for you.
viceman What part of NC are on June 28 ?
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Old 03-11-2009, 04:49 PM
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Default RE: Miss Martha's Speed ?

Hudson, a little over 2 hours from you

We will be holding a speed rally. Run wutcha brung and see what it will do. It was a lot of fun last year. One guy hit over 2 bills with a Q40 job. If you like fast planes this is the day to come out.
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Old 03-11-2009, 05:30 PM
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Default RE: Miss Martha's Speed ?

pffttttt................
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Old 03-11-2009, 05:38 PM
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Default RE: Miss Martha's Speed ?

Thanks Viceman! I will be there on June 28. Is there a web site about the event ?
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Old 03-11-2009, 05:46 PM
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Default RE: Miss Martha's Speed ?

Ahhh fresh blood............
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Old 03-11-2009, 10:31 PM
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Default RE: Miss Martha's Speed ?

Evan, You might want to beef up on the electrons this year. I plan to hit 180+ this year. That puts me in the realm of Bill J.[>:]

We look forward to meeting you TF
I"ll pm you with some more info soon.
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Old 03-12-2009, 08:25 AM
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Default RE: Miss Martha's Speed ?

How much throw and +/- on the expo should I put on the Miss Martha ? I can't find any info on that part.
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Old 03-16-2009, 08:20 PM
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Default RE: Miss Martha's Speed ?

Just wanted to show my progress. I still have to finish the wing. I'm adding a pic of my hanger.
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Old 03-16-2009, 10:12 PM
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Default RE: Miss Martha's Speed ?

snappy looking flame job.
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Old 03-18-2009, 11:27 AM
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Default RE: Miss Martha's Speed ?

Hey Tooo Fast,

What version of the Miss Martha do you have the plans for? I have plans for the 40 size Miss Martha 5 and I want to build one. I have also scaled up the plans to build a 60 size Miss Martha.

If I may suggest, take a close look at how your wing is attached to the plane. The reason I'm pointing this out is there was a club member where I fly that put a YS45 2 stroke on a Ultra Stick 40 which has ths same wing mounting system my Miss Martha plans show and the wing separated from the fuse during a high speed level pass.[:@] It was quite spectacular, but it didn't do the motor any good to be left out for a few weeks in the woods before it was found...[:'(]

Good luck with your plane. I'd like to hear about how it turns out.
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Old 03-18-2009, 07:43 PM
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ORIGINAL: hrrcflyer

Hey Tooo Fast,

What version of the Miss Martha do you have the plans for? I have plans for the 40 size Miss Martha 5 and I want to build one. I have also scaled up the plans to build a 60 size Miss Martha.

If I may suggest, take a close look at how your wing is attached to the plane. The reason I'm pointing this out is there was a club member where I fly that put a YS45 2 stroke on a Ultra Stick 40 which has ths same wing mounting system my Miss Martha plans show and the wing separated from the fuse during a high speed level pass.[:@] It was quite spectacular, but it didn't do the motor any good to be left out for a few weeks in the woods before it was found...[:'(]

Good luck with your plane. I'd like to hear about how it turns out.
The plans I have is for the 40 size. I hope my wing stays on because Im going by the prints.

Did you all find out what made the wing come off ?
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Old 03-19-2009, 06:48 AM
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Default RE: Miss Martha's Speed ?

Tooo_fast,

If I remember correctly, it broke the former that had the dowl holes in it and ripped it out, breaking dowls and the trailing edge of the wing at the hold down plate in the process. I don't remember hearing any wing flutter before it happened, but it could have been the cause...
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Old 03-19-2009, 06:42 PM
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Default RE: Miss Martha's Speed ?

Not familiar with this design, but in that first pic with the airfoil section, it looks to be around 18%. The first thing I would have done if I wanted to go fast is change that airfoil. That is a lot cheaper than chasing expensive engines. That airfoil has a lot of drag IMO.
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Old 10-23-2009, 07:11 PM
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Default RE: Miss Martha's Speed ?

I finally finished Miss Martha! Here is a picture of her. Now I have to wait till the weather gets better to test fly her.
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Old 10-24-2009, 06:52 PM
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Default RE: Miss Martha's Speed ?

I flew Miss Martha today! The wind was blowing hard and I ran into some issues with her. I'm going too try again on Monday.
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Old 10-28-2009, 08:32 PM
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Default RE: Miss Martha's Speed ?

I'm going to the field in the morning! Today I did some test. 46ax 9x8 prop 15% nitro 16500 rpm on the stand!
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Old 10-28-2009, 11:04 PM
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Default RE: Miss Martha's Speed ?

hey toooo fast, what's done to your AX? I have an AX that I think is going to find itself in a .25 size pony if it will pull the numbers yours does.
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Old 10-29-2009, 10:54 AM
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ORIGINAL: sportrider_fz6

hey toooo fast, what's done to your AX? I have an AX that I think is going to find itself in a .25 size pony if it will pull the numbers yours does.
I'm running a 9x8 Master Airscrew prop with a O.S. A5 glow plug and I removed the baffle from the exhaust.

Removing the baffle gave it about a 1000 rpm.
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