# Solar Powered boat

Discussion in 'Hydrodynamics and Aerodynamics' started by Zain, Jun 16, 2014.

1. Joined: Dec 2013
Posts: 27
Likes: 1, Points: 0, Legacy Rep: 11
Location: pakistan

### ZainJunior Member

we have build this boat by applying basic formulas
LH = 4.12ft LWL = 1.92ft B WL=1.1ft
using equation no 1 we can determine the beam of boat
Beam = LH^{2/3} + 1
Beam = 3.56ft
LBR =4.12/3.56=1.157ft

using equation no 2
B TR = B WL / T c
where T c is the extent to which boat sink in water
B TR =1.1/0.65=1.70
A value near two minimizes friction resistance and slightly lower values minimize wave makingReasonable values are from 1.5 to 2.8. Higher values increase load capacity.

using equation no 3
C m = A m / T c (x) BWL
C m depends on the shape of the midship section: a deep-V-section has C m = 0.5 while an ellipse section has C m = 0.785. Midship coefficient has a linear relation to displacement
C m=0.785
using equation no 4
S/L =1.856/1.38=1.33
See from table the value of cp=0.62
. Cp is typically between 0.55 and 0.64. Lower values (< 0.57) are optimized to displacement speeds, and higher values (>0.60) to speed over the hull speed
using equation no 5
put Tc=0.65ft
mLDC = 2 × BWL x LWL× T c × C p × Cm × 1025
mLDC=2×0.3352×0.585×0.1918×0.62×0.78×1025
mLDC=39.38kg
max weight a boat can bear is by putting Tc = 1.40ft
mLDC=83kg
using equation no 6
=5.62
using equation no 7
mLCC= 0.7 × mLDC
mLCC=27.56kg
using equation no 9
The engine power needed for the catamaran is typically 4 kW/tonne
P m = 4 x (mLDC/1025)
P m=0.1536kw
using equation no 10
the motoring speed is near the hull speed
V m = 2.44
V m=3.38 knott

still the roof of solar panels and propellers are not insstalled. i want to analyse the model can some body help me plz. because i want to write final report in which the chapter(analysis) is remaining.

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2. Joined: Nov 2003
Posts: 19,128
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Location: Eustis, FL

### PARYacht Designer/Builder

It would have been a lot cheaper and easier, to develop a reasonably efficient model with software, rather then guessing, which is what appears to have been the primary technique employed. Even free software would have made great improvements in your hull form (as pictured), which appears to be very limited and quite "draggy" to say the least. Simply put, if you can't see the obvious flaws in the shapes and ratios employed with this design, it's time to open a book or two and get accustomed with hydrodynamics. This isn't meant to insult you, but to skilled eyes there are lots of "issues", if interested in an easily motivated craft, of reasonable efficiency.

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