General Discussion
In reply to the discussion: Syrian "gas rockets" appear homemade and incapable of flying 5-10 miles to target. [View all]sarisataka
(22,660 posts)upwards of a dozen different systems in the Syrian military. It is not surprising that there are not many open sources that detail the interiors of these weapons but some detective work can give possibilities.
We need a short range rocket, large enough to hold that component and capable of chemical weapon delivery. These criteria eliminate some like the Type 63 or BM-4 as they are too small to hold a part that appears to be > 6 in. diameter. Others like the Farj 3 with a range of 43 km have too great of range to be likely.
We are left with 2 very good candidates. Most likely is the Soviet built BM-27 Uragan. It is a 220 mm rocket with a maximum range of 35 km and is capable of delivering chemical payloads. Syria is known to have 36 launch vehicles.
Another possibility is the BM-24. It is a 240 mm rocket with a maximum range of 11 km fits very well. A strike against it is the age of this system. Designed in 1953 many have been destroyed in combat or retired for newer systems. Syria was know to have used them in 1973 against Israel but it is not know how many, if any, are still in service.
It is not clear from the photos if there is any cant to the fins. They would use gasses for the rocket exhaust to generate spin so would not need to be extreme to produce enough spin to stabilize a rocket for the short duration of its flight. These are saturation weapons so accuracy is moderate at best.