Michlet 9.33 Released

Recent changes to Windows and some NVIDIA drivers caused many Michlet
graphic features to be painfully slow.
Version 9.33 fixes these problems for now. (But don't be surprised if
Windows changes again!)

After downloading the program, unzip into a convenient sub-directory.

Read the manual michman.pdf in the docs sub-directory.

 

Nice one. Grabbed it while it's hot. Thanks Leo.

 

Your handle is apt - I too have no idea whether the "fix" will work on all
Windows machines.
Good luck!

 

I'm having real problems with the new release. When I open up the application file it's basically frozen I can't even actually close out of it. is there something I'm missing?

 

What did you mean by "open up the application"?
Did you double-click on the batch file icon?
Did you press the Esc key to exit?
Did you read the manual?

 

Pays to read the directions..........thank. Never used a prompt based program before

 

Works perfectly

Thank you Leo


Any news on next release of Flotilla ?


Kind regards

Patrik

 

I'm working on the (symmetric) catamaran version atm. I hope to release it
within a month. After that I will finish off the SES version.

 

The next releases of Flotilla have been delayed for a couple of months.
I'm waiting on a book to be published by a friend which will contain mountains
of material on catamarans and SES. There will be a lot I can use from that.
Hopefully I'll learn a lot too!

 

One of those painful phrases which one reads and suddenly gets a measure of his own age...

 

Quick question for Leo. If looking into resistance for recreational rowboats in the Fn 0.24 > 0.45 range, how much better would Flotilla be than Michlet when it comes to estimating the relative performance of two hulls?

I say relative because unless both hulls are tested thoroughly at full scale there's no way of knowing the actual absolute values.

The reason I'm asking is because using Michlet is a very fast and simple process, while Flotilla is more stuffing around. I'd only be up for the extra rigmarole if the results were going to be noticeably better.

I suppose if Flotilla is definitely better one option would be to narrow the interesting range down with Michlet, then do the fine tuning with Flotilla.

 

. LOL

I always enjoy your contributions........even the serious ones.

 

Skin friction anomaly using MICHLET

I am running a very slender 50m hull at 12 tonnes displacement using the series 1 parametric option.
When I calculate the friction manually from the wetted area at 25m/sec using the ITTC 1957 formula I am getting close to 40kN If I take L/2 in the Reynolds number or about 36kN if I use L.
MICHLET output is around 28kN.

Am I using the program incorrectly or is there something about the calc that explains this difference?

Thanks in advance. Input file attached

Malcolm

 

I can't see why you are getting different skin-friction. Have you checked your calculations of the ITTC line and the Reynolds number?

 

I'm not sure if this is the right place to request a feature in Michlet or not, but have you ever considered allowing Godzilla to maximize speed for a given set of resistances, as opposed to minimizing resistance at a given set of speeds?

Seems pretty useful in a small boat design where you've got a good handle on how many paddlers, how big an outboard, or how much sail you can carry. One might be able to create a better "sweet spot" on the resistance curve for a given propulsion method.