# 18 mm 3 stage

### Help Support The Rocketry Forum:

#### TRFfan

##### Well-Known Member
WHat do you think?..Will probably get lost on the way down but still looks like a fun rocket..

View attachment 310232

#### timbucktoo

##### Well-Known Member
Staff member
TRF Supporter
Global Mod
Build it & tell us how it goes!

#### cerving

##### Owner, Eggtimer Rocketry
TRF Supporter
Sounds like you need a tracker that will fit in that... :wink:

#### neil_w

##### Tenet Rocketworks
TRF Supporter
Wow. :eyepop:

I set all the finishes to "polished" and got another 500' out of it.

Would you need to do something special to mount the 1mm fins to the BT? That's not a lot of surface area to hold on.

You should definitely build this, and take a lot of good pictures of it *before* you launch.

#### rharshberger

##### Well-Known Member
Sounds like you need a tracker that will fit in that... :wink:
Do you have one.....

#### TRFfan

##### Well-Known Member
Wow. :eyepop:

I set all the finishes to "polished" and got another 500' out of it.

Would you need to do something special to mount the 1mm fins to the BT? That's not a lot of surface area to hold on.

You should definitely build this, and take a lot of good pictures of it *before* you launch.

#### TRFfan

##### Well-Known Member
But dont the motors have to be touching each other to light each other?

#### neil_w

##### Tenet Rocketworks
TRF Supporter
You can gap stage if you add vents to the top of each booster. Those vents will add a bit of drag if course and cut into your 4000' flight.

Oh ok.