Using the large scale Crusader 2 wooden aero test model, we propose designing and building a 1:6 scale fully operable model of that design. The model will be powered by a jet engine and remotely controlled. The model will be built by Len Newton whose father-in-law was part of Cobb’s operations team at Loch Ness. Using his extensive engineering skills, he has already built a 1:6 scale fully operable model of Crusader 1 powered by a jet engine of his own design. We propose running and recording the performance of both models in order to compare the performance of both designs as well as the outright performance of each design.
To do this, we will use a 3D scanning company who will scan the wooden model to create a 3D image. From that scan, they will then produce a set of 2D plans from which Len Newton will build a composite hull for the Crusader 2 model. Since the wooden aero model was never to our knowledge subjected to any further designs evolutions or extensive testing, we have had to make a number of assumptions (see next section) about some elements of the design.
We will seek approval for use of a suitable tank and rig for towed tests of the Crusader 2 model. This repeats the tests carried out by Vospers for Crusader 1 so can be used for comparative purposes as well as deign validation.
After initial test and proving runs for both models, we will seek approval for use of a suitable test channel for a series of runs for each design. These tests will be filmed and timed so that the results form a key part of project output. The results will be the outright performance of each design as well as comparative performance. Again, this repeats the tests carried on the original Crusader 1 design using a solid fuel rocket powered model dubbed Water Baby.
Using the 3D scan, we will work with Nottingham University to produce a CFD (computational fluid dynamics) computer model to initiate a research and test program led by them. The goals of this program will be to:
- Check the viability of the existing Crusader 2 design (does it work, is it stable)
- Understand specific elements of the design such as the diagonal steps on the outside of each sponson, the downward curved section at the bottom of the rear section of the hull and the multiple steps at the bow (what do they contribute and why)
- What might the ultimate performance of this design have been (how fast would it go)
- What changes might be needed in order to make it fast and stable (design evolution)
Finally, we will compare the CFD tests results with the recorded model tests results to how closely they correlate.
The overall project purpose is therefore:
- To test and validate Railton’s Crusader 2 design and its projected performance
- To compare the projected performance of Crusader 2 with that of Crusader 1.
- To compare the projected performance of Crusader 2 with that of the existing record holder in period, Slo-Mo-Shun IV
- To compare the projected performance of Crusader 2 with that of the subsequent record holder in period, Bluebird K7.