As if you had to ask

Eric2004: The most important function of a dyno for personal use will always be to compare engine A to engine B to engine C and so on. I don't think many will buy a dyno just to brag to their friends that their motor puts out a particular HP. Thus, the motors should be broken in and tuned to race or operational settings before being put on the dyno -- just like a real car. Needle settings will differ from engine to engine, so to get the best and most usable results, the engines should be tuned and then dyno'd.

The throttle is opened mechanically at a constant rate across the length of the pull, keeping it consistent. You're correct that a hand-operated throttle would skew the results.

Can't help you on the fan, though I suspect that there is no cooling done to the engine during the test -- once again, a controlled environment is your best bet.

Check out the upcoming (and subsequent) issues of XRC for more information. A multi-engine test is coming soon.

Chen Pin has Xtreme R/C Cars magazine
I see... I see ....Thanks!

I had a idea long time ago.But just have no time to make it come true....

Use a 16ch high-speed I/O card to control some stepping motors. You can use it to control the throttle opening even use it to adjust the needles. Then one digital Stroboscope to detect the rpm. One digital anemo meter to detect the air flow. One digital temp meter to detect the engine temp. Use PC to control those equipment and collect those information. Then we can have one
electronic throttle and get the pure data ....

Although I can write the software myself but... too lazy....

actually what you want is to jack the throttle open as fast as possible to wide open throttle. Mine is going to use spring triggered opening and servo forced closing. You want the motor to pull as hard as possible on the flywheel from the bottom to the top. With an inertia dyno the whole premise is to determine how fast the engine can spool up the flywheel so instantaneus throttle opening is required.

you can tune the engine using exhaust temprature, it will be in the 900 degree range, obviously it will take several passes to find the window of optimum power.

I make no claim to knowing the best way to do things; my point is merely that it is done mechanically and not through operator intervention.

I have seen the dyno run but that's it -- I'll leave the actual workings to people who know a lot more than I do about nitro engines...

I think also it will be perfect ( just a dream) to link dyno to "race simulator" software, with real load on engine all over the track controled by this simulator, and see how engine is behaving. I think this will be the best info you can get out of dyno test. It will be realy tough to make this device, but it will be almost ideal.
Any ideas?

Get VRC to program in any track you want. Hook the throttle up to a servo and Y-link the lead with the USB connector. Then you get throttle control while playing the game. All data can be captured in a second computer taking the readings to reduce chances of computer crashing.

A couple of answers here.

Dynos are not designed to provide on-track data. Purely a tool to see which motor provides more power on the dyno (one of the reasons why the quote "We don't race on dynos" is true). A dyno can weed out those engines that are not up to snuff or track changes in performance from mods.

The throttle is worked just liek fullsized dynos. It's at idle (cleaned out) and then set to full throttle. This is how real dyno runs are taken too. Part of the dyno run is to see time related issues.

You can read the dyno information and make chages to your car. Especially when you have one of the on-board RPM sensors installed. Then you could make changes to the car so you are in the fat part of the dyno curve where the engine is making the most power.

Top Gun 777
when you get this dyno can you dyno tune my future motor, so that way i stay ahead of the game. ?

True, but a simulation, particularly a repeatable one, could indicate the suitability of an engine to a particular track type. For instance an engine with lots of top end and little on the bottom might not show well on a short twisty treak.

Remember that other saying: "Horsepower sells engines but torque wins races."

So "How Much" and "When"?

I was lucky today to be able to test PS12 on X-Dyno.
I can tell you -it is ammezing tool and can be use by any level racers. So easy to use, very friendly in control.
One more thing I wanted realy pointed-it is repeatability. We were running test after test with the same settings and it always was reading the same results. Ones something was changed-it indicate it right away.
I realy highely recomend to anybody, who is concidering to get dynostand-watch it-it will give you a lot of answer on any kind of complecated questions, which can pop when you work with nitro engines.
Thank you very much Brian to create such great tool and let me test my engine. It was real educatable and very very hepfull for me. In one day I got more info then I was able to get for while on track. Also, please say big thanks to your family, to be very patient with us.
Edward

how do i get one?

Send PM to DerekB here in forum, I am sure he will be able to help you.