Original kit it 46.3" x 3" - 29mm SU MMT

I'd like to make one that i can fly easy and cheaply on Estes 24mm,
C11 and D12 and E9.

How do i go about working the scal factor. I have a fin template of
the original to scale down too.

Anyone able to advise?

Pete

EP.Cyc...@googlemail.com wrote:

> Original kit it 46.3" x 3" - 29mm SU MMT
>
> I'd like to make one that i can fly easy and cheaply on Estes 24mm,
> C11 and D12 and E9.
>
> How do i go about working the scal factor. I have a fin template of
> the original to scale down too.
>
> Anyone able to advise?
>
> Pete

Thats pretty easy to do.

Take the dimesions of the original i.e 3" diameter. Divide this by the
diameter of the airframe tube you intend using

This gives your scale factor.

Now divide all of the dimensions of the original by this factor. Note.
you don't scale the angles involved as they remain the same.

Kev

On 23 Aug, 09:52, "ke...@clone.fsnet.co.uk"
 wrote:
> EP.Cyc...@googlemail.com wrote:
> > Original kit it 46.3" x 3" - 29mm SU MMT
>
> > I'd like to make one that i can fly easy and cheaply on Estes 24mm,
> > C11 and D12 and E9.
>
> > How do i go about working the scal factor. I have a fin template of
> > the original to scale down too.
>
> > Anyone able to advise?
>
> > Pete
>
> Thats pretty easy to do.
>
> Take the dimesions of the original i.e 3" diameter. Divide this by the
> diameter of the airframe tube you intend using
>
> This gives your scale factor.
>
> Now divide all of the dimensions of the original by this factor. Note.
> you don't scale the angles involved as they remain the same.
>
> Kev

Hi Kev,

Thank you for you time there!

Okay so say i want to use 2.14''/54mm dia tubing! I think this will be
a nice good size!

So 3 / 2.14 = 1.40 scale factor. Original kit it 46.3" x 3" so i have
cosen my airframe i am to use and got my scale factor.

46.3 / 1.40 = 33.07''

So the rocket will be 33.07 x 2.14''

That sound right and going to look right and okay as well?

Loc tubing is what i was thinking of using.

That going to be too much for D12? Tempted to maybe do a cluster if i
can get it in the tubes! If my memory serves me well i think 3 24mm
tubes will fit in a 54mm tube!

I'd have to do surface mount fins as i have 4 to fit if i was to do
the 3 MMT cluster

EP.Cycles@googlemail.com wrote:
 > Loc tubing [54mm] is what i was thinking of using.
 >
 > That going to be too much for D12? Tempted to maybe do a cluster if i
 > can get it in the tubes! If my memory serves me well i think 3 24mm
 > tubes will fit in a 54mm tube!

Here's a formula for determining how many tubes can be clustered inside 
a larger tube:

    X  =  1/sin(180/N) + 1

Multiple this "X" by the OD of the inside tubes to get the smallest 
possible ID of the outer tube.

In your model the "X" factor for three tubes is 2.155 and using Estes 
BT-50 motor tubes with an OD of .976" you'll need an airframe ID of at 
least 2.103". The ID of a LOC 54mm tube is 2.14" so you are good to go. 
If you use the LOC heavy-wall 24mm motor tubes you'll have to peel them 
a bit, or peel the inside of the LOC 54mm outer tube.

-- 
Steve Humphrey
(replace "spambait" with "merlinus" to respond directly to me)

On Aug 23, 5:54 pm, Steve Humphrey  wrote:
> EP.Cyc...@googlemail.com wrote:
>
>  > Loc tubing [54mm] is what i was thinking of using.
>  >
>  > That going to be too much for D12? Tempted to maybe do a cluster if i
>  > can get it in the tubes! If my memory serves me well i think 3 24mm
>  > tubes will fit in a 54mm tube!
>
> Here's a formula for determining how many tubes can be clustered inside
> a larger tube:
>
>     X  =  1/sin(180/N) + 1
>
> Multiple this "X" by the OD of the inside tubes to get the smallest
> possible ID of the outer tube.
>
> In your model the "X" factor for three tubes is 2.155 and using Estes
> BT-50 motor tubes with an OD of .976" you'll need an airframe ID of at
> least 2.103". The ID of a LOC 54mm tube is 2.14" so you are good to go.
> If you use the LOC heavy-wall 24mm motor tubes you'll have to peel them
> a bit, or peel the inside of the LOC 54mm outer tube.
>
> --
> Steve Humphrey
> (replace "spambait" with "merlinus" to respond directly to me)

HI all
if you need tubeing give me a ring at apo11o
i have all that you need in stock
alan m

On 24 Aug, 18:33, apollo  wrote:
> On Aug 23, 5:54 pm, Steve Humphrey  wrote:
>
>
>
>
>
> > EP.Cyc...@googlemail.com wrote:
>
> >  > Loc tubing [54mm] is what i was thinking of using.
>
> >  > That going to be too much for D12? Tempted to maybe do a cluster if i
> >  > can get it in the tubes! If my memory serves me well i think 3 24mm
> >  > tubes will fit in a 54mm tube!
>
> > Here's a formula for determining how many tubes can be clustered inside
> > a larger tube:
>
> >     X  =  1/sin(180/N) + 1
>
> > Multiple this "X" by the OD of the inside tubes to get the smallest
> > possible ID of the outer tube.
>
> > In your model the "X" factor for three tubes is 2.155 and using Estes
> > BT-50 motor tubes with an OD of .976" you'll need an airframe ID of at
> > least 2.103". The ID of a LOC 54mm tube is 2.14" so you are good to go.
> > If you use the LOC heavy-wall 24mm motor tubes you'll have to peel them
> > a bit, or peel the inside of the LOC 54mm outer tube.
>
> > --
> > Steve Humphrey
> > (replace "spambait" with "merlinus" to respond directly to me)
>
> HI all
> if you need tubeing give me a ring at apo11o
> i have all that you need in stock
> alan m- Hide quoted text -
>
> - Show quoted text -

Hi Alan,

I was looking at using Loc tubing as it will be a lot more stiffer and
stronger. I really want to make nice robust!

Premium Birch Plywood (1/8in. thk) for the fins is what i was
thinking, be 4 of them.

On Aug 24, 7:46 pm, EP.Cyc...@googlemail.com wrote:
> On 24 Aug, 18:33, apollo  wrote:
>
>
>
>
>
> > On Aug 23, 5:54 pm, Steve Humphrey  wrote:
>
> > > EP.Cyc...@googlemail.com wrote:
>
> > >  > Loc tubing [54mm] is what i was thinking of using.
>
> > >  > That going to be too much for D12? Tempted to maybe do a cluster if i
> > >  > can get it in the tubes! If my memory serves me well i think 3 24mm
> > >  > tubes will fit in a 54mm tube!
>
> > > Here's a formula for determining how many tubes can be clustered inside
> > > a larger tube:
>
> > >     X  =  1/sin(180/N) + 1
>
> > > Multiple this "X" by the OD of the inside tubes to get the smallest
> > > possible ID of the outer tube.
>
> > > In your model the "X" factor for three tubes is 2.155 and using Estes
> > > BT-50 motor tubes with an OD of .976" you'll need an airframe ID of at
> > > least 2.103". The ID of a LOC 54mm tube is 2.14" so you are good to go.
> > > If you use the LOC heavy-wall 24mm motor tubes you'll have to peel them
> > > a bit, or peel the inside of the LOC 54mm outer tube.
>
> > > --
> > > Steve Humphrey
> > > (replace "spambait" with "merlinus" to respond directly to me)
>
> > HI all
> > if you need tubeing give me a ring at apo11o
> > i have all that you need in stock
> > alan m- Hide quoted text -
>
> > - Show quoted text -
>
> Hi Alan,
>
> I was looking at using Loc tubing as it will be a lot more stiffer and
> stronger. I really want to make nice robust!
>
> Premium Birch Plywood (1/8in. thk) for the fins is what i was
> thinking, be 4 of them.- Hide quoted text -
>
> - Show quoted text -

HI
i have the more stiffer tubes come in as a new line later this year
they will be called are H range  ,, Im the only uk suppler of the foil
line motor tube
which is the same as loc 24 but with a foil lineing  /my 29mmt is all
so the same /38 is the same and my 54 loc is loc
alan m

On 25 Aug, 09:31, apollo  wrote:
> On Aug 24, 7:46 pm, EP.Cyc...@googlemail.com wrote:
>
>
>
>
>
> > On 24 Aug, 18:33, apollo  wrote:
>
> > > On Aug 23, 5:54 pm, Steve Humphrey  wrote:
>
> > > > EP.Cyc...@googlemail.com wrote:
>
> > > >  > Loc tubing [54mm] is what i was thinking of using.
>
> > > >  > That going to be too much for D12? Tempted to maybe do a cluster if i
> > > >  > can get it in the tubes! If my memory serves me well i think 3 24mm
> > > >  > tubes will fit in a 54mm tube!
>
> > > > Here's a formula for determining how many tubes can be clustered inside
> > > > a larger tube:
>
> > > >     X  =  1/sin(180/N) + 1
>
> > > > Multiple this "X" by the OD of the inside tubes to get the smallest
> > > > possible ID of the outer tube.
>
> > > > In your model the "X" factor for three tubes is 2.155 and using Estes
> > > > BT-50 motor tubes with an OD of .976" you'll need an airframe ID of at
> > > > least 2.103". The ID of a LOC 54mm tube is 2.14" so you are good to go.
> > > > If you use the LOC heavy-wall 24mm motor tubes you'll have to peel them
> > > > a bit, or peel the inside of the LOC 54mm outer tube.
>
> > > > --
> > > > Steve Humphrey
> > > > (replace "spambait" with "merlinus" to respond directly to me)
>
> > > HI all
> > > if you need tubeing give me a ring at apo11o
> > > i have all that you need in stock
> > > alan m- Hide quoted text -
>
> > > - Show quoted text -
>
> > Hi Alan,
>
> > I was looking at using Loc tubing as it will be a lot more stiffer and
> > stronger. I really want to make nice robust!
>
> > Premium Birch Plywood (1/8in. thk) for the fins is what i was
> > thinking, be 4 of them.- Hide quoted text -
>
> > - Show quoted text -
>
> HI
> i have the more stiffer tubes come in as a new line later this year
> they will be called are H range  ,, Im the only uk suppler of the foil
> line motor tube
> which is the same as loc 24 but with a foil lineing  /my 29mmt is all
> so the same /38 is the same and my 54 loc is loc
> alan m- Hide quoted text -
>
> - Show quoted text -

Mail me with a price for

54mm dia BT
24mm foil lined MMT tubes enough to make 3 MMT
NC for BT
E hooks
Motor blocks
E spacers

So these new H tubes, are like loc but stiffer?