Talk:Martin JRM Mars

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Recient use?

Was there an article showing one dropping water last week (July/August 2024) in Colorado? 99.185.73.8 (talk) 02:29, 5 August 2024 (UTC)[reply]

Gross Weight?

The use of the “Gross Weight” label in the specifications is incorrect; the 90000lb value is more likely to be the Useful Load. TechViking (talk) 15:21, 31 August 2024 (UTC)[reply]

MTOW vs Engine Type

There are discrepancies in the Maximum Takeoff Weight (MTOW) in the specifications for the JRM-3 Mars. Is the MTOW 165,000lb with the 2,500hp Wright R-3350 Duplex-Cyclone engines, or just with the 3,000hp Pratt & Whitney R-4360 Wasp Major.

In the specifications section, the sited source [4, Jane’s Fighting Aircraft of WWII p.244] provides the JRM-1 model specifications with MTOW of 145,000lb with Wright R-3350-18 2200hp engines, but does not include the JRM-2 or JRM-3 models.

In the Variants section, the reference [38] for the JRM-2 and a subsequent link from that page only mentions an increased MTOW but not by how much. However, the 165,000lb value is supported by the January 2009 issue of Aviation History : “The JRM-2’s increased power permitted a takeoff weight of 165,000 pounds and added more than 10,000 pounds to its useful load.” That same paragraph implies that the increased MTOW for the subsequent JRM-3 variant is linked to the R-4360 and, in a later paragraph, that a lower limit for the water bomber with the R-3350 applies: “The decision to switch to R-3350 engines, and accept the resultant reduction in payload, was likely due to long-term maintenance considerations.” The Aviation History article also states that, for the JRM-1, “the installation of 2,500-hp R-3350-24W engines, plus new four-bladed propellers, boosted takeoff weight to 148,500 pounds.” This differs from the 145,000lb listed from other sources. Unfortunately the web version of this article does not list its sources.

Finally, the other source [48] sited in the Specifications section for the JRM-3 is from Coulson Aviation for the water bomber conversion, but it lists 162,000lb MTOW with the 2,500hp R-3350-24WA. Note: the original source link is dead but the web archive PDF is still valid.

So, should the MTOW for the JRM-3 water bomber conversion with the R-3350-24WA engines be 145,000lb, 148,500lb, 162,000lb or 165,000lb?

Should there be a separate specifications section for “Civilian Use/Water Bomber”, and the original military JRM-3 specifications be edited to indicate the R-4360-4T engine with the 165,000lb MTOW? TechViking (talk) 17:34, 31 August 2024 (UTC)[reply]