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Search: Posts Made By: cmulder
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11-16-2022, 05:24 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Question do you feel like wasting $3?

would that pump surfive pumping fuel ? then you would have a much more direct flow controll compaired to compressing a gas.
power it trough a small brushed esc for example.
10-27-2022, 08:43 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

think its just a tube that v=blocks

think the fuel pressure pushes the tube out of the way once a pressure is exeeded.
The inner bronse tube goes down half way between the input and return.
10-27-2022, 08:39 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

it isn't empty

You can look straight trough the 2 bottum connections but the red tube thing is blocking the top one.
Looks like some over pressure valve.

Where do they sell those one-way check valves like ys...
10-27-2022, 04:23 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

could this be usefull?

Found this while sorting trough things.
It once came with a batch of used items and always assumed it was related to the retracts system and never opened it.
Turns out its a fuel pressure regulator...
09-28-2022, 02:43 PM
Replies: 1,228
Views: 27,006
Posted By cmulder

the exhoust port is round right?

Don't have a wankel so working from memmory here ;)
if you have acces to tube bending tools would a tube bend so it wraps around the engine not be a option?
And if your club is not too strict about...
09-28-2022, 09:25 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

tuned pipe?

Looks like you created a primitive tuned pipe.
See if by making it longer or shorter you can find a "sweet spot" for the peak rpm you are looking for.
09-25-2022, 03:59 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

yea but..

Assumtion is the mother of all f-ups
While i share your doubd a pressurised tank is the way to go, trying might teach us things and then once there is a good working "proof of concept" see if it...
09-25-2022, 03:52 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Question wrong pressure?

Are there any "full size" equivalents where the fuel tank is pressurised?
As far as i know. most use a fuel pump .
So why not focus on finding a small fuel pump instead and avoid all the plumbing...
09-12-2022, 09:57 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Post try a "pull down" resistor

Likely there is almost no current flowing so any external noise has a relative big influence.
If you place a resistor between the pulse and ground then that resistor will "short" the noise but not...
09-07-2022, 05:20 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Lightbulb this material might be good for printing carbs and engine parts

Claims to be heat resistant up to 190c and also resistant against petrol....
08-28-2022, 04:38 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Post It depends on what material you print with

There is filament that has choped up glass and even carbon fiber mixed with the plastic.
That is basicly the same as the graupner and master airscrew prop plastics.
Resin needs to be translucent...
08-28-2022, 01:27 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Post abs smoothing

Some plastics that dissolve in acetone can be made smooth with a procedure called "vapor smoothing (https://all3dp.com/2/abs-acetone-smoothing-3d-print-vapor-smoothing/)"
This might also work on asa...
08-27-2022, 07:42 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

box of chocolates?

I highly doubd this boat ever ran well if at all. Lets say there is a diference between buying a kit and having the skills to build it correctly.

This thing needs to be stripped down and rebuild...
08-27-2022, 07:38 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Thumbs up there is smoke

White smoke ?
So engine runs and draws fuel.
Needless to say it showed the next problems.
The pressure nipple from the exhoust fell off relative easy fix once i can borrow a rivet tool to close...
08-26-2022, 02:55 PM
Replies: 1,228
Views: 27,006
Posted By cmulder

potentional solenoid software feature?

On some of my heli engines that are prone to flooding i start lean and slowely open the needle while starting until it fires.
On the solenoid that could be a feature to slowly incease the amount of...
08-26-2022, 02:06 PM
Replies: 1,228
Views: 27,006
Posted By cmulder

Post O-ring at carb base is new and carb was pushed...

O-ring at carb base is new and carb was pushed down while tightning the clamp-bar nut so that should be ok.
Back plate gasket yes that is a suspect.
On piece crankcase so no leak there
Carb was...
08-26-2022, 11:08 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

in the water

Am worried about ever revving so am starting in the water.
The engine starts if it has fuel but it just doesn't draw it from the tank by itself.
The carb has been apart so have no idea about the...
08-26-2022, 09:54 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

best way to make a carb suck more?

AM wondering about the fuel draw issue.
What if there is a sleeve inserted in the carb to reduce the diameter of the opening of the barrel?
That part is easy to take out of the carb by just...
08-26-2022, 08:38 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Thumbs up engine only runs off its prime

Some succes and the next problem.
Was able to get the engine to fire but it only runs a short while off it prime.
It does not draw fuel unless i put a finger over the air intake.

In all am verry...
08-25-2022, 12:28 PM
Replies: 1,228
Views: 27,006
Posted By cmulder

Post all new for me too

This came with a batch of rc things that included a almost complete raptor30 heli kit (reason i bought it) a crashed ego30 heli (stripped it down for engine and servos) and a unbuild multiplex...
08-25-2022, 09:07 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

starting

It goes into the groove on the flywheel and around a groove on the starter cone of a electric starter on the other side.
Then you are supposed to hold the starter up and press the boat down to get...
08-25-2022, 08:52 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

ugly plumbing

Completed mounting the engine and hooked up the cooling lines.
Got a 12v (fuel) pump and am wondering if that could help avoid overheating the engine?
There is about 2c between the screw and that...
08-24-2022, 12:41 PM
Replies: 1,228
Views: 27,006
Posted By cmulder

are there still any made?

Just in case this 6.5cc isnt good enough are there still outboard engines being made ?
08-24-2022, 09:59 AM
08-24-2022, 09:55 AM
Replies: 1,228
Views: 27,006
Posted By cmulder

Arrow progress

https://cimg7.ibsrv.net/gimg/www.rcuniverse.com-vbulletin/1024x768/img_5951_c125917709dfd621d208f98b26fca2107c3a9d9a.jpg
test fit
Next is to get replacemnts nuts and washers to secure the engine...
Showing results 1 to 25 of 110
 


 
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