Fast launches and scale speed matters
😊 😊
Fast Launches etc and scale speed matters.
We model boaters are In a different situation ref scale speed matters as opposed to the likes of railway and car buffs.
Typical example being that a 1/32nd scale slot car can travel at 5 mph which gives It a scale speed of 160 mph.
However when It comes to a 1/32nd scale MTB or ASRL, 32 knots would mean sailing at a speed of 1 knot. At this speed It Is unlikely the model would plane nor would there be a wake that would replicate Its full size counterpart.
I remember an old formula from many years ago which stated that a dynamic scale speed could be calculated.
This would take Into account both scale of the model and a realistic appearance on the water.
Formula Is to find the square root of the scale and then multiply It by the speed of the full size craft and It Is quite easy to calculate.
For our 1/32nd scale launch to appear to be sailing at 32 knots we would need a pocket calculator and steps are as follows=
1 Dived 1 by 32 which equals 0.03125.
2 Press square root button and 0.176766
will appear.
3 Multiply 0.176766 x 32
(this being the speed of full size boat) and the answer will be 5.65 knots. This will be the speed the model needs to sail at to replicate the performance of the full size boat.
Using this formula with smaller craft eg 1/72 scale P.T boats etc, 40 knots would be represented by a scale speed of 4.7 knots.
When calculating speeds of P.T boats etc, the actual speed of the full size boats was often less than 40 knots as most were war weary with engines and hulls worn out.
Film references such as They Were Expendable and P.T 109 are excellent
for determining what a P.T boat would perform like.
The best sequence Is near the start of They Were Expendable when the Squadron Is under Japanese air attack and the boats disperse under full power In the bay. 😊
The planing angle Is a bit less that I have seen on some models.
Book references are Squadron/Signal Publications P.T Boats In Action No 7 and Vosper MTBs In Action no 13
Boaty 😊
Fast Launches etc and scale speed matters.
We model boaters are In a different situation ref scale speed matters as opposed to the likes of railway and car buffs.
Typical example being that a 1/32nd scale slot car can travel at 5 mph which gives It a scale speed of 160 mph.
However when It comes to a 1/32nd scale MTB or ASRL, 32 knots would mean sailing at a speed of 1 knot. At this speed It Is unlikely the model would plane nor would there be a wake that would replicate Its full size counterpart.
I remember an old formula from many years ago which stated that a dynamic scale speed could be calculated.
This would take Into account both scale of the model and a realistic appearance on the water.
Formula Is to find the square root of the scale and then multiply It by the speed of the full size craft and It Is quite easy to calculate.
For our 1/32nd scale launch to appear to be sailing at 32 knots we would need a pocket calculator and steps are as follows=
1 Dived 1 by 32 which equals 0.03125.
2 Press square root button and 0.176766
will appear.
3 Multiply 0.176766 x 32
(this being the speed of full size boat) and the answer will be 5.65 knots. This will be the speed the model needs to sail at to replicate the performance of the full size boat.
Using this formula with smaller craft eg 1/72 scale P.T boats etc, 40 knots would be represented by a scale speed of 4.7 knots.
When calculating speeds of P.T boats etc, the actual speed of the full size boats was often less than 40 knots as most were war weary with engines and hulls worn out.
Film references such as They Were Expendable and P.T 109 are excellent
for determining what a P.T boat would perform like.
The best sequence Is near the start of They Were Expendable when the Squadron Is under Japanese air attack and the boats disperse under full power In the bay. 😊
The planing angle Is a bit less that I have seen on some models.
Book references are Squadron/Signal Publications P.T Boats In Action No 7 and Vosper MTBs In Action no 13
Boaty 😊
Dave Keech