# Mid to High Power Blast Deflectors

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#### cwbullet

##### Obsessed with Rocketry
Staff member
Global Mod
I have built two mid to high-power launch pads and want to add a blast deflector to the bottom of the rail. I am looking for ideas on how to do that.

#### dhbarr

##### Amateur Professional
One of the reasons I favor disker blades is that many already have a square center hole just a bit bigger than 1in * 1in

#### Tobor

TRF Supporter
When I discovered the Jawstand launchpad thread, Corzero turned me on to the Wilton Cake Lifter as his choice for a blast deflector. Unfortunately, it is not listed on Amazon any longer but there several knockoffs available like (This one).

#### Scott231

I believe you can go to Menard's, Home Depot etc. and find a piece of flat steel for less than $12.00 #### teepot ##### Well-Known Member TRF Supporter I use a AR 500 rifle gong for a blast deflector. It is indestructible. #### Rocketjunkie ##### Addicted to APCP Chuck, I believe I have a couple more of the stainless plates I used on the X pads. I'll check the storage unit next visit. #### bobbyg23 ##### Well-Known Member TRF Supporter I believe you can go to Menard's, Home Depot etc. and find a piece of flat steel for less than$12.00
Do you know what department this is in? I have looked and can't find any that cheap.

#### JimByrne

##### Well-Known Member
I have built two mid to high-power launch pads and want to add a blast deflector to the bottom of the rail. I am looking for ideas on how to do that.
Show a picture & we can give you some ideas---I have built several

#### Scott231

##### Well-Known Member

Keep scrolling around, you'll find something that works in here.

#### H. Craig Miller

##### Well-Known Member
TRF Supporter
Here's a low and mid power blast deflector made from an Aerotech Mantis launch pad...
In those instances where additional blast deflection is desired, the post slides through the center hole of a 14" diameter Diablo high speed metal cut-off disc before being inserted into the stand.

#### GrouchoDuke

##### Well-Known Member
I have one of these that I use for my towers (so far, up to J1026). It's a little thinner/more flexible than I'd hoped, but it works well. https://www.amazon.com/gp/product/B01JAPJYHK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Cake lifter launch deflector in action (J1026 & I224)...

EDIT: FWIW, I did this G150 launch without that pie spatula...it's a G motor, what harm could it do? Yeah, it blasted about a 1 foot diameter, 1/2" deep hole in the lakebed. Don't do that.

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#### Mike Haberer

##### Well-Known Member
TRF Supporter
When I discovered the Jawstand launchpad thread, Corzero turned me on to the Wilton Cake Lifter as his choice for a blast deflector. Unfortunately, it is not listed on Amazon any longer but there several knockoffs available like (This one).
I use this as well. I haven't launched anything larger than an I on it yet. It didn't get damaged by it, so I expect it can handle at least a K.

#### ep29030

##### Mark N.
TRF Supporter
If you find a welding shop, most of them can cut a piece of metal (mild steel or stainless steel) to about any size and metal thickness you want. I would get a 16-18 ga. steel thickness for most blast deflectors. I put an 18 ga mild steel plate on the ROCI large pad, and it's held up to J-K motors with no issues. It is tack welded to a piece of 3/16" x 2" wide piece of flat steel that runs down the middle on the underside, and is bent at a 45 degree turn where it bolts to the rail. Recommend the reinforcement steel under the plate--some motors hammer that blast deflector pretty hard. We used some ceramic tile blast deflectors that were cracked by H-I motors.

#### cwbullet

##### Obsessed with Rocketry
Staff member
Global Mod
Thanks! Lots of new ideas.

#### ep29030

##### Mark N.
TRF Supporter
One nice thing about deflectors at steeper angles, like 20-45 degrees, is that they deflect exhaust away from the underside of the rocket. Flat (horizontal) deflectors send the gasses back up to the rocket, burning the aft end.

#### cwbullet

##### Obsessed with Rocketry
Staff member
Global Mod
One nice thing about deflectors at steeper angles, like 20-45 degrees, is that they deflect exhaust away from the underside of the rocket. Flat (horizontal) deflectors send the gasses back up to the rocket, burning the aft end.
Only if they are too close to the rocket. Our x pads are all horizontal and I have yet to see a burned rocket.

#### FredA

##### Well-Known Member
Angled blast deflectors may also change your flight path.

Remember - at liftoff, the force on the blastplate equals the force lifting the rocket.
Angle the blastplate and that becomes a force trying to bend your guidance rod/rail.

If you must use, mount at the very bottom where the rotational torque is lessened.

#### ep29030

##### Mark N.
TRF Supporter
Only if they are too close to the rocket. Our x pads are all horizontal and I have yet to see a burned rocket.
Good for you guys. It's rare that I don't have a blackened/burned rocket just about every time I fly, with about 4-6 inches of clearance to blast plate. Seems you would need to be 10-12 inches above the deflector to avoid it.

#### cwbullet

##### Obsessed with Rocketry
Staff member
Global Mod
Good for you guys. It's rare that I don't have a blackened/burned rocket just about every time I fly, with about 4-6 inches of clearance to blast plate. Seems you would need to be 10-12 inches above the deflector to avoid it.
5-6 is enough for me. Are you flying sparkles?

#### mrwalsh85

##### Well-Known Member
What, everyone's scared of a little battle scar?

I still have scorch marks from the flame deflecting up the rail opening to my rail buttons on a couple of my birds. That's actually pretty awesome. No damage otherwise. L's and M's.

#### cwbullet

##### Obsessed with Rocketry
Staff member
Global Mod
What, everyone's scared of a little battle scar?

I still have scorch marks from the flame deflecting up the rail opening to my rail buttons on a couple of my birds. That's actually pretty awesome. No damage otherwise. L's and M's.

#### ep29030

##### Mark N.
TRF Supporter
5-6 is enough for me. Are you flying sparkles?
No. Most of mine are standard (WL) type propellants

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