imposterlertor 2.0

Changes made:
- redid rotator belt cover
- new ACA timer assembly
- added horn screen
- remeshed horn rear
- repainted
- recolored stator

The Penetrator-10 (also named the P-10) was the first model to appear in 1980 and was designed as the successor of the Allertor 125 to perfect the design faults the Allertor had, such as ice buildup in the projector drum. It took the horn and intake cone from the ACA Howler and enlarged and redesigned them to fit the Allertor's proportions and would be sold alongside the Howler. It uses a dual-sided Doerr (later Baldor) 10 hp AC motor to drive both the 18-inch chopper and the rotator at once and was available in 8-port single tone and 9/12-port dual tone. 9/12-port dual tone is much more common on the Penetrator-10 compared to its 15 horsepower counterpart. The P-10 was available in either single or 3 ph power.

The P-10 uses a chain-driven rotator, which is located underneath the siren. The siren's motor is coupled to a gear reduction drive that drives a shaft vertically through the siren towards the bottom, where it rotates a gear against the chain to rotate the entire siren unit on a stationary base. The chain itself is covered on top with a teardrop-shaped cover to protect it from the elements and is the same rotator that the 3rd generation Allertor uses. The rotator was also reused on early ACA Alertronic AL-6000R units, though rear-facing.

Due to the intake and projector being placed together, as well as the lack of a compression drum, the P-10's overall sound output is slightly lower than the Allertor 125, which has the intake and projector separate. As a result, the P-10 is only able to achieve 125 dB at 100 ft, 1 decibel shy of the Allertor. Despite its lower output than the Allertor, the projector's benefits such as ease of maintenance and resistance to ice more than make up for the performance loss. The P-10 was available with conical or cylindrical intakes, with the conical intakes being more common on P-10 models. The conical intakes are prone to collapsing, due to the bolts rusting out.

It can be difficult to tell a P-10 and a P-15 apart without seeing the tag, as they are visually nearly identical. The best way to tell them apart is the windup speed, as the P-10 will often wind up a bit slower. This is not always reliable, however, as 1 ph units of both models may struggle to reach full pitch with worn run capacitors. With dual-tone sirens being seen as no longer necessary after the Cold War ended, the P-10 was discontinued when ACA went bankrupt in 1992 and was not carried over during ACA's transition to ASC. It was likely decided that it was no longer worth producing both sirens when the P-15 handled the single tone rotor better.





























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