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I have an older Sullivan Model 4 starter powered from two 12V SLA batteries. One of the batteries died and needs to be replaced. Has any one tried running one of these starters off a Lipo battery or similar? Thinking there might be something smaller/lighter than the lead batteries. Thanks in...

How large of nitro engine can a wire drive be used ? Will they handle a 45, 67, and 90 size engine? Mike

I do not have a 3D printer but source the parts from a print service - so don't know about the moisture part. Once I get the parts, I coat them in an epoxy microballons mixture to fill the grooves between print layers. Sand smooth, add primer layer, and polish smooth. Mike

Terry, This is an older picture - but it does show the general materials. I am using three layers of braided carbon sleeve. The sleeve material is from Soller Composites. It is their 3K type. The sleeves come in different sizes and can expand/contact some. There is a limit though. For the tail...

Carl, Yes the Cotronics 4461 epoxy does have an ambient temperature first. It is considered a room temperature cure epoxy. I vacuum bag the parts for 8 hrs. and then remove from the bag. The epoxy is solid but a little tacky to the touch still. I then let the parts air temp cure for another 12...

Terry, EngMod2T does not have anything specific for the pipe material. You do have inputs for pipe temperature for a few points. This where the Dyno would be great to test a few different pipe materials on the same pipe design. Mike

Terry, What did the glow plug look like after the run? Mike

Terry, The CF pipes I have made have only been 21 size so far. For an oven I use a small Paragon Kiln my wife has that has now been "re-purposed" to the RC engine program. It it just large enough to fit a fully assembled pipe. The kiln is overkill as the post cure is only 250 deg F for 4 hours...

I have been using product from Cotronics Corp. for making pipes for 21 size engines. It is a room temperature cure Epoxy that is good to 500 deg. I do post cure treat it in an oven as directed to bring to full strength. It is thicker than a normal laminating type epoxy but does work. As a result...

Terry, If you decide to go with EngMod2T, let me know. I have been using it for a few years to design carbon fiber tuned pipes used on a 21 size glow ignition RC drag car. Like all things, there is a learning curve to the program. The author of the program has been very helpful in answering...

I am using a EGT sensor from Pyromation. It is a 1/16 dia 316 stainless steel probe, shielded exposed junction MgO type K thermocouple. The probe is bent at 90 deg to fit inside the pipe. This can be ordered from the factory - custom order. I am using the EGT sensor mounted at the center of the...

The hydrometer is used for measuring nitro percentage. Methanol is used to change the nitromethane percentage. When mixing my own fuel, measuring the nitro percent before adding oil and then again after adding oil did not show a noticable change in the nitro percentage reading. It might be be...

The Enderle Hydrometers from Good Vibrations is a good one to use. It is a glass bulb style hydrometer with the temperature calibration built into it. Also a reasonable cost. Have used this type for years on a top fuel drag boat before switching to the electronic type. I use the Enderle one for...

Tim, On the Eagle Tree logger, the thermocouple expansion board can handle two thermocouples. So you only need one of those. The thermocouples are up to you. I did not use the Eagle Tree ones but bought from another source. I used a thermocouple supply company.  The EGT sensor with compression...

Tim, No problem on the logger questions. Be glad to help. I do not use the real time telemetry. Instead after a run I download the data from the logger to a laptop. I then import the data file into an Excel spreadsheet that is more customized/easier to view than what Eagle Tree offers. I do...

I have my boats set up with an Eagle Tree system. I am measuring EGT and cylinder head temperature. An example using a MAC 67 with AB 67 pipe in an older 67 Eagle SG rigger running 60% Nitro I will typically see between 550 - 650 deg F EGT. This is when the boat is at wide open throttle. I am...

What size engine are you trying to bore out? I have done a few 21 size car engines. Used a straight flute carbide drill then a small boring bar. The boring bar was tricky due to small size and wanting to chatter. Mike

Jim, Thanks for the info. Gets me in the ballpark. What I am trying to do is figure out what range pressure sensor might be used with an Eagle Tree Data logger equipped with an analog to digital converter board. I want to measure the pipe pressure at wide open throttle and see the effects of a...

How much pressure does the exhaust gas exert on the fuel tank pressure line? Has anyone put a pressure sensor on the tank pressure line for a 21 size engine? Mike

Lohring, Not sure I follow how the intake tuning formula is supposed to work. Can you explain farther? Mike