by PICKETBOAT » Wed Sep 05, 2012 3:53 am
Phil
There is no extra buoyancy in this 1/48th scale slim shallow hull, for inserting the water powered smoke generators, currently in vogue. This model like my previous model (HMS Velox) is fitted with the Graupner 6V smoke generators. These are originally designed for model trains. I have found that they work well and safely on 7.2V and make a good amount of smoke. I fitted one in each funnel casing and then then put a small 12V (laptop cooling) fan, running on 4.8V, in the hull. The slight draft from this is ducted to the funnel bases with 20mm plastic tube. This ensures the smoke comes out realistically rather than just drifting out. The smoke units were modified to increase their oil capacity to extend running time. Smoke units and fan are controlled by a servo fitted with a plastic cam and two micro switches. Smoke running time about 30min.
The down side is that the main model power(6V), the receiver power(4.8V), the smoke unit power(7.2V) and the fan power(4.8V) each have a separate battery and on board charging circuit so charging the model involves plugging in 4 different chargers! The plus is that there is no radio interference and nothing on board is draining power from another function. This system has been working faultlessly for 3 years in my other model which has 3 funnels (3 Graupner smoke units).
WARNING Running these units on 7.2V seems to be fine (3 years fault free) but I always use the manufacturers own smoke oil. Using other oils (with lower flash points) might be risky. Going onto any higher voltage than 7.2V is very risky. I can not be held responsible for any thing going wrong. Everything worked fine for me but bench test everything first.
Good luck
PICKETBOAT
Phil
There is no extra buoyancy in this 1/48th scale slim shallow hull, for inserting the water powered smoke generators, currently in vogue. This model like my previous model (HMS Velox) is fitted with the Graupner 6V smoke generators. These are originally designed for model trains. I have found that they work well and safely on 7.2V and make a good amount of smoke. I fitted one in each funnel casing and then then put a small 12V (laptop cooling) fan, running on 4.8V, in the hull. The [u]slight draft[/u] from this is ducted to the funnel bases with 20mm plastic tube. This ensures the smoke comes out realistically rather than just drifting out. The smoke units were modified to increase their oil capacity to extend running time. Smoke units and fan are controlled by a servo fitted with a plastic cam and two micro switches. Smoke running time about 30min.
The down side is that the main model power(6V), the receiver power(4.8V), the smoke unit power(7.2V) and the fan power(4.8V) each have a separate battery and on board charging circuit so charging the model involves plugging in 4 different chargers! The plus is that there is no radio interference and nothing on board is draining power from another function. This system has been working faultlessly for 3 years in my other model which has 3 funnels (3 Graupner smoke units).
[color=#FF0040]WARNING[/color] Running these units on 7.2V seems to be fine (3 years fault free) but I always use the manufacturers own smoke oil. Using other oils (with lower flash points) might be risky. Going onto any higher voltage than 7.2V is very risky. I can not be held responsible for any thing going wrong. Everything worked fine for me but bench test everything first.
Good luck
PICKETBOAT