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Cox katydid arf build
Page 1 of 1
Cox katydid arf build

I have had this plane for over a year now, and it is finally time to actually do some work on it
so far what i have done is attach the elevator, rudder and glue the two wing halves together
please feel free to give tips on how you might go about finishing a plane
P.s. im going with out l.g's because I have a perfect grass feild by my house that I intend to fly in
thanks
mitchg95- Diamond Member
- Posts : 2103
Join date : 2011-12-19
Age : 27
Location : Geneva, mn, USA
Re: Cox katydid arf build
Put an engine in it. Plumb it with electrics and go fly.
I like your T-Shirt!
What did you want to know specifically?
Ron
I like your T-Shirt!
What did you want to know specifically?
Ron
Cribbs74- Moderator
Posts : 11880
Join date : 2011-10-24
Age : 48
Location : Tuttle, OK
Re: Cox katydid arf build
cribbs74 wrote:Put an engine in it. Plumb it with electrics and go fly.
I like your T-Shirt!
What did you want to know specifically?
Ron
thanks for the compliment on the shirt

im buying at engine from happy dad for the plane, i probably do have the electronic's that i need but i will have to look as i have not checked my supply in a while
I was wondering if there are any special considerations that I should take when I am building, and how it flies.
It says on the box that AUW should be around 24oz which is on the heavy side of what i want to get this thing to way, i assume they were using standard size servo's and i could probably save a few ounces by using servos that way around 9grams, but with a wingspan of 42'' should i use 9g servos?
mitchg95- Diamond Member
- Posts : 2103
Join date : 2011-12-19
Age : 27
Location : Geneva, mn, USA
re: servos
mitchg95 wrote:cribbs74 wrote:Put an engine in it. Plumb it with electrics and go fly.
I like your T-Shirt!
What did you want to know specifically?
Ron
thanks for the compliment on the shirt
im buying at engine from happy dad for the plane, i probably do have the electronic's that i need but i will have to look as i have not checked my supply in a while
I was wondering if there are any special considerations that I should take when I am building, and how it flies.
It says on the box that AUW should be around 24oz which is on the heavy side of what i want to get this thing to way, i assume they were using standard size servo's and i could probably save a few ounces by using servos that way around 9grams, but with a wingspan of 42'' should i use 9g servos?
based on the size of the rudder and elevator surfaces i would use something in between the 9gram and standard servos. they used to have one called a bantam midget i used for wings, etc. up to 36inches. and a 72inch wing plane would require standard servos or heavy duty steel geared servos.
it all depends on what you will be doing with the plane. if you try to do loops and aerobatics you would NOT want your servo to stall or quit on you.





happydad- Rest In Peace
- Posts : 1592
Join date : 2012-05-28
Age : 77
Location : Escondido, CA
Re: Cox katydid arf build
happydad wrote:mitchg95 wrote:cribbs74 wrote:Put an engine in it. Plumb it with electrics and go fly.
I like your T-Shirt!
What did you want to know specifically?
Ron
thanks for the compliment on the shirt
im buying at engine from happy dad for the plane, i probably do have the electronic's that i need but i will have to look as i have not checked my supply in a while
I was wondering if there are any special considerations that I should take when I am building, and how it flies.
It says on the box that AUW should be around 24oz which is on the heavy side of what i want to get this thing to way, i assume they were using standard size servo's and i could probably save a few ounces by using servos that way around 9grams, but with a wingspan of 42'' should i use 9g servos?
based on the size of the rudder and elevator surfaces i would use something in between the 9gram and standard servos. they used to have one called a bantam midget i used for wings, etc. up to 36inches. and a 72inch wing plane would require standard servos or heavy duty steel geared servos.
it all depends on what you will be doing with the plane. if you try to do loops and aerobatics you would NOT want your servo to stall or quit on you.happydad
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thanks for the input, with me loops and other basic aerobatics is going to happen, i will opt for standard servos then
mitchg95- Diamond Member
- Posts : 2103
Join date : 2011-12-19
Age : 27
Location : Geneva, mn, USA
Re: Cox katydid arf build
Well, at 24oz you will not be doing much aerobatics with an engine that pulls about 12oz. I think you started of correctly, you do need to keep the weight down. The load on the servos comes from the size of the rudder surfaces and the speed of you plane, and you do not need standard servos that are usually used with .40 sized engines.
The HS-65HB has carbonite gear and will take any beating you can give it (in the air). Use only lightweight stuff, tank and batteries etc are also important, and you will be rewarded with a lightweight well flying plane.
The HS-65HB has carbonite gear and will take any beating you can give it (in the air). Use only lightweight stuff, tank and batteries etc are also important, and you will be rewarded with a lightweight well flying plane.
Surfer_kris- Diamond Member
- Posts : 1864
Join date : 2010-11-20
Location : Sweden
Re: Cox katydid arf build
Hextronix 9 gram should work from Hobby king. Value hobby has the power HD servos that are supposed to be good also. They have some metal gear 9 gram servos.
Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 47
Location : Neenah, WI
Re: Cox katydid arf build
Surfer_kris wrote:Well, at 24oz you will not be doing much aerobatics with an engine that pulls about 12oz. I think you started of correctly, you do need to keep the weight down. The load on the servos comes from the size of the rudder surfaces and the speed of you plane, and you do not need standard servos that are usually used with .40 sized engines.
The HS-65HB has carbonite gear and will take any beating you can give it (in the air). Use only lightweight stuff, tank and batteries etc are also important, and you will be rewarded with a lightweight well flying plane.
i think i have a hs-65hb, I will have to check
thanks
mitchg95- Diamond Member
- Posts : 2103
Join date : 2011-12-19
Age : 27
Location : Geneva, mn, USA
Re: Cox katydid arf build
Ditto the Hitecs.
I use them in all my lekky aerobats albeit the
MG's.
In my Old Timer (55 in 26oz) I use no name nines
No problems so far. IMO the place to save weight is
The battery I use a 150mah in mine (8 grams) if you're
Using 3 servos you could use a 210mah which are about 15 grams.
You can get them on Fleabay for a few bucks.
I use them in all my lekky aerobats albeit the
MG's.
In my Old Timer (55 in 26oz) I use no name nines
No problems so far. IMO the place to save weight is
The battery I use a 150mah in mine (8 grams) if you're
Using 3 servos you could use a 210mah which are about 15 grams.
You can get them on Fleabay for a few bucks.

John Goddard- Diamond Member
- Posts : 2447
Join date : 2011-11-24
Age : 58
Location : Leyton North East London
Re: Cox katydid arf build
i have not gotten much done to the plane over the past day, been mainly working on my dirtbike just maintaining it 
the things that i have gotten done, i cut the servo mount strips down to size
i have a hs55 servo, which is all plastic gear, is there much price difference between the hs 65 and the 55?

the things that i have gotten done, i cut the servo mount strips down to size
i have a hs55 servo, which is all plastic gear, is there much price difference between the hs 65 and the 55?
mitchg95- Diamond Member
- Posts : 2103
Join date : 2011-12-19
Age : 27
Location : Geneva, mn, USA
Re: Cox katydid arf build
If you're intent on using it Mitch it'll be
Ok although I'd leave it off the elevator.
The 65's are half as powerful again but the
55's are a couple grams lighter.
I've got 55's in my Bacaruda which has 'arrived'
Several times without damaging them when
Similar incidents wrote off no name 5 gram'ers.
The thing to watch out with small plakky geared
Servos is not to knock the control surfaces when
Transporting and storing the plane cos this is what
Strips the gears.
Ok although I'd leave it off the elevator.
The 65's are half as powerful again but the
55's are a couple grams lighter.
I've got 55's in my Bacaruda which has 'arrived'
Several times without damaging them when
Similar incidents wrote off no name 5 gram'ers.
The thing to watch out with small plakky geared
Servos is not to knock the control surfaces when
Transporting and storing the plane cos this is what
Strips the gears.

John Goddard- Diamond Member
- Posts : 2447
Join date : 2011-11-24
Age : 58
Location : Leyton North East London
Re: Cox katydid arf build
go with the 65's, u can get a pair for 45 bucks and put a cheap-o on the throttlemitchg95 wrote:i have not gotten much done to the plane over the past day, been mainly working on my dirtbike just maintaining it
the things that i have gotten done, i cut the servo mount strips down to size
i have a hs55 servo, which is all plastic gear, is there much price difference between the 65 and the 55?
ChaseBanner- Gold Member
- Posts : 125
Join date : 2021-09-27
Location : Arkansas

» ( Sold) NIB Cox Katydid
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» Looking for first RC build...
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» cox katydid on ebay
» Guillows Cessna 150 build circa 1970 (Build Log)
» Looking for first RC build...
» Help Deciding on Kit
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