Miss Martha

 

Miss Martha - plan thumbnail image

Miss Martha - completed model photo more pics (4)

Miss Martha  
by Bob Richards
1985 
47in span
Tags: IC R/C
all formers complete :)


Submitted to Outerzone: 16/04/2018
Outerzone planID: oz9991 | Filesize: 182KB | Format: • PDFbitmap | Credit*: JeffGreen

   

About this Plan

Miss Martha. Radio control fun-fly sport model for .40 - .50 power.

Note this is a modern re-drawn plan.

Quote: "You don't have anything on the 'Miss Martha' R/C fun fly model from the 1980s on Outerzone. I created these photos [model photo & more pics 003, 004] & this PDF from sources on the internet when I couldn't find copies of the kit plans. Roughly, it has a 47 inch wing span, uses a two cycle .40-50 size motor & needs a four channel radio. I don't know who designed the Miss Martha or if it was ever kitted. I saw one fly many years ago, I can remember it being really fast for the size motor it used, I think it was a TT .36? & it was really aerobatic. Tight snap rolls, one after the other."

Direct submission to Outerzone.

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User comments

Wish I had photos but back in the '80s our club (Gloucester Area Model Association) GAMA had a ball with Martha's as a club build!!!... Mine was modified to a T tail and shortened the nose 3/4" for a 4stroke .40... such a sweet flying plane!! ...as a trainer a .20 would fly it... 45 2stroke with a pipe and it would accelerate vertically!!!
BillV - 21/04/2018
I have not been able to find a photo with the rudder shape shown on the plan. What is correct? See pict. on plan details.
Karsten - 23/04/2018
I love my Miss Martha, built sometime in the early eighties from the plans before the kit became available. Lots of kit-built models appeared at our field, but mine was the first and is now the last. Nobody even remembers what it is. First powered by a light weight Fox 40, the engine developed a problem, it wouldn't quit using the throttle, just kept ticking along with the barrel completely closed. This presented a problem in the climb and glide event, so it was replaced with an Enya, plus tail weight to balance the heavy engine. I even won some events with old Martha, now enjoying a much deserved retirement, only flown maybe once a year. Untold engines and radios have experienced Martha's tender mercies, last test engine was an MDS 40. That stands for Mostly Dead Stick. One of those emergency landings was into the Black Hole, which wiped out the landing gear and I had to make some repairs. If this landing gear departs the plane, I'll have lots more problems than landing gear. Current test engine is an OS 46, maybe just a little too much for Martha. I had to add balance weights to the ailerons to prevent flutter. Wide open, she's now a little too much for me too, and I fly her mostly part throttle. Headed straight up, she will accelerate until quickly out of sight, however glide is like an F-104, so it doesn't take long to be back on the ground. I've since had to re-cover the wing, sunlight having turned the MonoKote brittle. Stars are from the first flight, which overshot the runway into the stubble, punching holes in the wing. Stars filled the holes. Your plans, later than mine, look accurate except for a larger rudder. Your version may need this, as mine is reluctant to spin. If you want a fun airplane, give Martha a try, a good 25 is plenty of power. [See more pics 005, 006.]
DougSmith - 23/04/2018
As for the rudder, mine has has the original straight rudder, the triangle shape must have been added later. When in doubt, just use the big one and if it needs to be modified just cut it off.
DougSmith - 24/04/2018
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Notes

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Scaling

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