Simon's Balsa Rigger

[Simon.O.]

After all the info I gathered from the Rigger design thread here it is.

The LOA is 630mm
The sponsons are at 240mm inside to inside
Sponson to tub gap is 90mm
Sponsons are 15mm below the tub line.
Cf booms
Cf rudder and turn fin
All hand made hardware.

Will run a Superstock 23t (27krpm) motor
0.62 wire drive
531 or modded prop
6 x IB4200 push the smoke about.

I am waiting on a mini servo and a few other small bits to complete the build.
Hatches are made and varnish is drying.

Comments + Questions ??

[smm_cbf]

very clean, nicely built, great job

[eclipse]

looks killer
more pics with hatch??if its dry.
vid when done??

[Simon.O.]

Well it is all finished now.
I took it for its first run yesterday and it was not alll as I had hoped for.
It ran very wet on the sponsons and was a little slower than my hydro.
Not fair as they both have the same motor/prop/cells combo.
I gave it a few little tweaks on the strut and it improved a little.
On the way home I was thinking ride pads, wings, more power......

I got it on the flat bench to check the strut settings and guess what we found?
I had set it excactly 5mm too deep on the strut, htf did that happen?
No wonder it was nose wet.
I am surprised that it even planed out.

I have reset the strut to give a better AoA on the sponson bottoms and will give it a whirl this morning.

Completed pics to come.

[Avanti]

beautiful rig Simon

[Ub Hauled]

If everything else fails, it is a good looking rigger man...
:)

[Simon.O.]

At last I got it up and running……well !!
To my eye I am seeing 50km/h or 30mph

This is a total success. I designed, built and ran it !
I win !

o.k so I am not about to come to the LA saws and take some records, but I am so happy that it works.

Someone asked for pics of it with hatches on and here they are, in the water too.
Here is a bit of a crap video of it running. I just set the camera on the tailgate of my truck and let it go.

http://s15.photobucket.com/albums/a392/simono/?action=view&current=P6260713.flv

There was a small problem as it hit something and that tore the rudder off.
Back home and a good session with the soldering iron got that sorted.
Pics of damage and repair.

I can now see why riggers are the go for speed as this hull is now faster than my shovel style hydro and shows no signs of frontal lift or other bad behaviour that the hydro shows.

Given the design methods I use I believe that I am now ready to do a Canard type of hull.

There are other threads on this and I will post there soon.

My rigger goes !!
I am happy !!

[Jeepers]

NICE

install one of the Feiago S or L size motors and a 2s lipo pack and that thing would SCREEEEEAM!

[Simon.O.]

I am holding off going the lipo and BL route at the moment. I like to see just what I can get from brushed cans because I know that some insane speeds have been achieved on "old technology ". If I can get some good pace with the old style gear then I will know that my design and setup are good.
I know that lipo and BL will give me more speed but to me they are only overcoming design issues. The old adage of give anything enough power and it will fly comes to mind here.

I have yet to try the 17t in this boat.
When I had it in the hydro it gave me all sorts of headaches regarding frontal lift.
In the Cat it was a blast, so I think in the rigger it should be good for a laugh.
I have room and enough CoB envelope to get another cell in there too.
Let's see what happens.

btw. Wife has volunteered to come and shoot some vid soon.

[Ub Hauled]

I used a 6X2 in a SAW rigger and got it up to 52+ mph...
keep in mind it's ONLY and I mean ONLY 2 passes per time...
then it has to cool off.

[Simon.O.]

Some more very successful runs today.
I began with a 531 which is a very nice prop for this motor. It went well !!
Then I threw on a 534, this had a slightly higher speed by eye but had a terrible hook-up time.
I then went to a 431 and it was amazing.
Out of the hole was near instant and this little rigger went like a greased weasel.

A few different online FE calcs and indeed my own prop formulae tell me that the 531 should be faster than the 431 but water time tells me different.

I believe that the 431 allows the motor to spin a little more freely and thus make up for the difference in pitch.

Does this sound right ??

Motor is 23t ( 27500 rpm )
6 x IB 4200 NiMh

[Eyekandyboats]

that looks more like 22=25mph to me.
nice job tho ! keep it up

[Simon.O.]

Bouy wins !!

I joined the bouy bashing club today.

Rigger vs. 20 litre container anchored to the bottom.
Score = Bouy 1 , rigger damaged.

All is o.k as the damage is now repaired and it is ready to hit the water tomorrow.

[Ub Hauled]

Just like new... ready for the next confrontation.

[ED66677]

Hey Simon! look really nice man, any sketch for me?