PML Centering Rings
Pml manufactures a full line of heavy duty motor mount tube centering rings and bulk plates to fit their airframe tubes. Centering rings and bulk plates for airframe 3.9" and smaller are 3/16" birch plywood, while centering rings and bulk plates for airframes 6.0" and larger are 1/2" 9-PLY, birch plywood. Multiple motor mount configurations are available upon request.
"Bulkhead Plates" fit inside the airframe tube while "Coupler Bulkhead Plates" fit inside the coupler tubing.
Centering Rings (CR)" fit inside the airframe tubing while "Coupler Centering Rings (CCR)" fit inside the coupler tubing.
| Order # | Description | Fits Airframe. | For MMT | Thickness | Price |
| CR-1.5-1.1 | Centering Ring | 1.525" | 1.145" | 0.1875" | $2.35 |
| CR-2.1-1.1 | Centering Ring | 2.152" | 1.145" | 0.1875" | $2.58 |
| CR-2.1-1.5 | Centering Ring | 2.152" | 1.525 | 0.1875" | $2.58 |
| CR-2.5-1.1 | Centering Ring | 2.560" | 1.145" | 0.1875" | $2.58 |
| CR-2.5-1.5 | Centering Ring | 2.560" | 1.525" | 0.1875" | $2.58 |
| CR-2.5-2.1 | Centering Ring | 2.560" | 2.152" | 0.1875" | $2.58 |
| CR-3.0-1.1 | Centering Ring | 3.002" | 1.145" | 0.1875" | $3.18 |
| CR-3.0-1.5 | Centering Ring | 3.002" | 1.525" | 0.1875" | $3.18 |
| CR-3.0-2.1 | Centering Ring | 3.002" | 2.152" | 0.1875" | $3.18 |
| CR-3.9-1.1 | Centering Ring | 3.900" | 1.145" | 0.1875" | $3.54 |
| CR-3.9-1.5 | Centering Ring | 3.900" | 1.525" | 0.1875" | $3.54 |
| CR-3.9-2.1 | Centering Ring | 3.900" | 2.152 | 0.1875" | $3.54 |
| CR-3.9-3.0 | Centering Ring | 3.900" | 3.002" | 0.5" | $5.22 |
| CR-6.0-1.5 | Centering Ring | 6.007" | 1.525 | 0.5" | $7.50 |
| CR-6.0-2.1 | Centering Ring | 6.007" | 2.152" | 0.5" | $7.50 |
| CR-6.0-3.0 | Centering Ring | 6.007" | 3.002" | 0.5" | $7.50 |
| CR-6.0-3.9 | Centering Ring | 6.007" | 3.900" | 0.5" | $7.50 |
| CR-7.5-2.1 | Centering Ring | 7.512" | 2.152" | 0.5" | $8.82 |
| CR-7.5-3.0 | Centering Ring | 7.512" | 3.002" | 0.5" | $8.82 |
| CR-7.5-3.9 | Centering Ring | 7.512" | 3.900" | 0.5" | $8.82 |
| CR-11.4-2.1 | Centering Ring | 11.41" | 2.152" | 0.5" | $12.54 |
| CR-11.4-3.0 | Centering Ring | 11.41" | 3.002" | 0.5" | $12.54 |
| CR-11.4-3.9 | Centering Ring | 11.41" | 3.900" | 0.5" | $12.54 |
| CCR-11.4-6.0 | Coupler Centering Ring | 11.41" | 6.007" | 0.5" | $13.95 |
| CCR-11.4-7.5 | Coupler Centering Ring | 11.41" | 7.512" | 0.5" | $13.95 |
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| Order # | Description | Fits Airframe. | For CT | Thickness | Price |
| CCR-2.1-1.1 | Coupler Centering Ring | 2.152" | 1.145" | 0.1875" | $2.70 |
| CCR-2.1-1.5 | Coupler Centering Ring | 2.152" | 1.525" | 0.1875" | $2.70 |
| CCR-2.5-1.1 | Coupler Centering Ring | 2.560" | 1.145" | 0.1875" | $2.70 |
| CCR-2.5-1.5 | Coupler Centering Ring | 2.560" | 1.525" | 0.1875" | $2.70 |
| CCR-3.0-1.1 | Coupler Centering Ring | 3.002" | 1.145" | 0.1875" | $3.30 |
| CCR-3.0-1.5 | Coupler Centering Ring | 3.002" | 1.525" | 0.1875" | $3.30 |
| CCR-3.0-2.1 | Coupler Centering Ring | 3.002" | 2.152" | 0.1875" | $3.30 |
| CCR-3.9-1.1 | Coupler Centering Ring | 3.900" | 1.145" | 0.1875" | $3.54 |
| CCR-3.9-1.5 | Coupler Centering Ring | 3.900" | 1.525" | 0.1875" | $3.54 |
| CCR-3.9-2.1 | Coupler Centering Ring | 3.900" | 2.152" | 0.1875" | $3.54 |
| CCR-3.9-3.0 | Coupler Centering Ring | 3.900" | 3.002" | 0.5" | $5.34 |
| CCR-6.0-1.5 | Coupler Centering Ring | 6.007" | 1.525" | 0.5" | $7.62 |
| CCR-6.0-2.1 | Coupler Centering Ring | 6.007" | 2.152" | 0.5" | $7.62 |
| CCR-6.0-3.9 | Coupler Centering Ring | 6.007" | 3.900" | 0.5" | $7.62 |
| CCR-6.0-3.0 | Coupler Centering Ring | 6.007" | 3.002" | 0.5" | $7.62 |
| CCR-7.5-2.1 | Coupler Centering Ring | 7.512" | 2.152" | 0.5" | $8.95 |
| CCR-7.5-3.0 | Coupler Centering Ring | 7.512" | 3.002" | 0.5" | $8.95 |
| CCR-7.5-3.9 | Coupler Centering Ring | 7.512" | 3.900" | 0.5" | $8.95 |
| CCR-11.4-2.1 | Coupler Centering Ring | 11.41" | 2.152" | 0.5" | $12.90 |
| CCR-11.4-3.9 | Coupler Centering Ring | 11.41" | 3.900" | 0.5" | $12.90 |
| CCR-11.4-3.0 | Coupler Centering Ring | 11.41" | 3.002" | 0.5" | $12.90 |
| CCR-11.4-6.0 | Coupler Centering Ring | 11.41" | 6.007" | 0.5" | $13.68 |
| CCR-11.4-7.5 | Coupler Centering Ring | 11.41" | 7.512" | 0.5" | $13.68 |
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| Order # | Description | Fits Airframe. | For MMT | Thickness | Price |
| BP-1.1 | Bulkplate | 1.145" | - | 0.1875" | $1.74 |
| BP-1.5 | Bulkplate | 1.525" | - | 0.1875" | $1.74 |
| BP-2.1 | Bulkplate | 2.152" | - | 0.1875" | $1.86 |
| BP-2.5 | Bulkplate | 2.560" | - | 0.1875" | $1.86 |
| BP-3.0 | Bulkplate | 3.002 | - | 0.1875" | $1.98 |
| BP-3.9 | Bulkplate | 3.900" | - | 0.1875" | $2.10 |
| BP-6.0 | Bulkplate | 6.007" | - | 0.5" | $7.14 |
| BP-7.5 | Bulkplate | 7.512" | - | 0.5" | $7.75 |
| BP-11.4 | Bulkplate | 11.41" | - | 0.5" | $13.15 |
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| Order # | Description | Fits Airframe. | For MMT | Thickness | Price |
| CBP-1.5 | Bulkplate for Coupler | 1.525" | - | 0.1875" | $1.74 |
| CBP-2.1 | Bulkplate for Coupler | 2.152" | - | 0.1875" | $1.74 |
| CBP-2.5 | Bulkplate for Coupler | 2.560" | - | 0.1875" | $1.74 |
| CBP-3.0 | Bulkplate for Coupler | 3.002" | - | 0.1875" | $1.86 |
| CBP-3.9 | Bulkplate for Coupler | 3.900" | - | 0.1875" | $2.10 |
| CBP-6.0 | Bulkplate for Coupler | 6.007" | - | 0.5" | $7.14 |
| CBP-7.5 | Bulkplate for Coupler | 7.512" | - | 0.5" | $7.75 |
| CBP-11.4 | Bulkplate for Coupler | 11.4" | - | 0.5" | $13.15 |
Custom Centering Rings Motor Mount Hole Drilling: PML will drill additional motor mount holes in your centering rings for you. Simply enter the total number of holes you need, indicate that a custom order is requested. Number of holes, hole diameter, please allow a minimum of 0.125" between holes and edge of ring.
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