Simon's Mini rigger

[Simon.O.]

I have near had it with the larger 540-XL based hulls. They are fun but get very expensive when smoke appears.

The small hulls especially OR motored are a lot of fun so here is a new one.

The "design" is based on a few pics I printed and then it is the good old build by eye and proportions based off the other two riggers.

Some pics.

[Ub Hauled]

watching to see what turns out m8...

[Simon.O.]

One drama with build by eye is that a lot of stuff is guess work.
I want the sponsons about "there" but where will that put my possible CG ?
Well I loaded up the "kitset" with a few bits of about the right weight and tried it.
Guess what ?? I get a CG at about 15% of AP (afterplane) woohoo !!

My other two rigger run a CG well aft of that and are rockets on the (calm) water.
This gives me room to move the CG fore or aft with minimal fuss and if I really need to I can add ballast (not unknown with my boats).

Here is a pic of the CG finder and a possible stance.

[Ub Hauled]

Simon, I am not sure that this will work to find your true CG, although technologically advanced (ha ha) you need to make sure the carbon booms are in their right CG relative to the sponsons (put them in their desired placement by taping it down as it will be glued) and same with all of the other items that will go onboard... just wrapping things up will not work, I've done it. It will also help if you have the motor, batteries, motor mount, hardware, etc.
If you have done so, disregard this whooooole paragraph, lol

[Simon.O.]

Simon, I am not sure that this will work to find your true CG, although technologically advanced (ha ha) you need to make sure the carbon booms are in their right CG relative to the sponsons (put them in their desired placement by taping it down as it will be glued) and same with all of the other items that will go onboard... just wrapping things up will not work, I've done it. It will also help if you have the motor, batteries, motor mount, hardware, etc.
If you have done so, disregard this whooooole paragraph, lol

Jan you are absolutely correct with your description and it is a farkup I have made before.

This "kitset" is close to where all the intended bits will be including a 10mm socket pretending to be transom hardware.

I have a bit of latitude with component placement and will now build the hull.
I get to move the pack a bit too before lead goes in !!

[Simon.O.]

It is very wet and windy here so I got a pile of workshop time today.
This is where we are now, just before I did the roast chicken and veg for dinner.

Pics from today.

[Simon.O.]

Here are some dimesions for those who may be interested

LOA is 19 3/4"or 500mm, Width is about 12"

Tub 15" 380mm by 2 3/8" 60mm with a max height of 2 1/8" 55mm
Sponsons 8" 205mm loa 6"150mm nose to pad rear. 1 1/16 26mm wide

Tub nose to rear ride surface of sponson is 1 1/4" 32mm
Gap between tub and sponson is 4" 100mm

Cg is currently at 15% of the afterplane and can be moved with component placement or lead ballast.

AoA of the sponsons will be set at 4 deg with the tub neutral and with strut adjustment I will be able to get up to 6 deg AoA on the sponsons.

The ride height is now set at 7/8" 15mm.

The plan is for a 4000kv 450 size heli OR on 3S to a 427 prop.

[Simon.O.]

Sorry for the lack of progress reports on this one, I have been busy finishing it.
It got wet today !
First off I noticed that the sponson tips sat under water at rest.
A quick blip of the throttle and it wanted to submarine. Another blip, pause as it bounces back up and then pin it breifly got it up on the plane easily, the motor seemed to cog a bit and then stop. more cogging and then a puff of smoke from the hatch, yes smoke will blow hatch tape.

That was the poxy 35A speedie done and I am lucky it did not take the pack with it as it sits on top of it.
A quick reconfigure of parts and I managed to squeeze the 40A esc and 1600mAh pack from the micro cat in there.

It went well but did not amaze me. The pack was well of peak, heavy and this was its first run so I am happy for that.
It has no turn fin at the moment and I may get away withoiut one.

I have now got a spare esc set to go and should run it again on saturady morning.
The launch from standstill just takes a bit of control, that will be fun to master.

More later but for now here is the HW that needs to be cleaned up and polished.

[Simon.O.]

I have had a few good runs from this rigger and there is a lot of potential left.

I swapped in the motor from the micro-cat which is the same model to see if i had a dud motor. It is a lot better but the micro cat is still nuts with the old motor out of the rigger, how and why I am not sure but that is a different hull and different story.

Now it is a lot better but I can see more to come.
Options:
1.Use a bigger pack and speedy to really unleash the motor
2. Try a bigger prop like a 30, 31 or 32 mm. High pitch props in this size are hard to come by.
3. Keep the 4000kv 28mm OR motor and feed it with 4S

At the moment option 3 is doable and attractive. It will mean mid 40krm on a small OR motor but I think that will sound sexy at wot !!

This will get interesting soon.

[Simon.O.]

While I am sorting a new motor for this one I decided to rob the motor out of the mini-cat and give that a whirl today.
It was well windy and choppy so I needed to work out a better way to get this one on the water and runing.
I have seen many clips of nitro boats being launched and figured that the underhand lob is the way to go.

It certainly is for this little bugger

With the bigger motor it was a lot better, similar rpm but far more audible and visible power. I even got to wind out a 432, which given the water conditions was not a real smart move.

I now need a new motor for this, I will stay with an OR and am now looking at the Typhoon series motors, a 430 may have to go in the prop box soon too.

[Ub Hauled]

Video somewhere Simon?

[Simon.O.]

Jan, you will be one of the first to know when I can film my hulls on the water !

I have run this a few times now with a 3850kv 400 heli class OR motor and it is all good.
I have run 427, 432 and even a 632, it did not like that.

I am now deciding if OR motors are the best here. I have a lot of success with OR motors in some applications.

Jesse asked me a while ago to see if I can do a side by side comparison to see which is a better style of motor. I think it is time now that I got a few more motors and did some serious on water testing.

I have a home for the smaller 4000kv OR motor. It will sit on the left side

At the moment this little bugger hauls at about 50kmh and it looks very cool, it still needs a "nitro" hand-launch !!

[Simon.O.]

WTF is that smell, get it out of the house !!!

She yelled at me to get that sh1t awful smelly thing out of the house, ..."and it can stay out there !!"

This is the culprit

[Ub Hauled]

oh man... where there used to be an ESC now there is a smelly sachet... ziplock bags usually help to contain the smell

[Simon.O.]

A ziplock bag would have been more fuel for the fire !
The depth of charring is almost right through the skin which is 3mm (1/8")
All is good the pack survived as it was separated from the esc with a thick alloy plate which also is covered in that nice smelly sticky shiate that comes out of dead speedies.

A few days in the sun and a few coats of varnish to seal in the rest of the smell and all will be good.
NO MORE Mystery 30A escs in here though. A Turnigy 40 or more should slip in nicely.