Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. FullSpool

    Slope and Area Calculation help

    I am trying to calculate an area of ground that has a 2.5 to 1 slope. The slope changes in length across a mass area. My question is looking at it from a top view I can see where the lengths of the slope change, I can flood that area and use CAD tools to get the area of that region. However...
  2. FullSpool

    RC aircraft dyno

    LionelHutz P=(inertia x N2^2/2 - inertia x N1^2/2)/dt inertia = inertia of the flywheel. N2 = final rotating speed N1 = initial rotating speed dt = time to go from initial speed to final speed. I got looking at your formula again and I am interested to see how this might work for my...
  3. FullSpool

    RC aircraft dyno

    I have not ruled out anything for the load yet as im still working on the engine assembly. My work load is leaving me little time for projects so I am still up for suggestions. From my past conversations with mustang dyno they were suggesting a 7.5 hp AC motor with a constant torque from 0-6000...
  4. FullSpool

    RC aircraft dyno

    I have a pickup sensor mounted to the engines case and a magnet on the prop hub, as it spins I capture RPM on a digital screen for read out. As far as capturing torque I have a shaft that mounts to a plate (engine mounts to this) on one end and the other goes through 2 pillow block bearings...
  5. FullSpool

    RC aircraft dyno

    I understand.
  6. FullSpool

    RC aircraft dyno

    BigClive, the link doesn't work for me. Thanks
  7. FullSpool

    RC aircraft dyno

    And for the second part of your post I have a feeling you have trouble sensing sarcasm so I will leave it at that. Anyways with the flywheel I am afraid that every time the cylinder fires there is an increase of acceleration of moving parts, with a heavy flywheel such as that 350 it will not...
  8. FullSpool

    RC aircraft dyno

    I don't think you understand the size of these air crafts ,104- 110" wing span swings a 27x10 to 28x10 prop. 25% 30cc 16"-18" prop 30% 50cc-60cc 22" -24" prop 38% 100cc-120cc 27"-29" prop 42% 150cc-170cc 30"-33" prop
  9. FullSpool

    RC aircraft dyno

    That 350 flywheel would probably snap cranks lol
  10. FullSpool

    RC aircraft dyno

    These aircraft are giant scale 71" to 120" wing span. 30cc to 120cc 2stroke Gas engines.
  11. FullSpool

    RC aircraft dyno

    I am just looking for peak HP at the moment.
  12. FullSpool

    RC aircraft dyno

    For HP? There readings are theoretical with a known test prop and no actual real world data to back up there claims. Well 90% of the manufactures are guilty of this.
  13. FullSpool

    RC aircraft dyno

    The thing with propellers is that depending on the type the torque measurements will change, so do I need to find which prop provides the most torque and use it for my HP calculations? Thrust can easily be captured as im not concerned about that nor fuel consumption as that isn't an interest...
  14. FullSpool

    RC aircraft dyno

    what I would do is use the same manufacture for each prop but different sizes, 20"x8, 19"x8, and 18"x8 for a 30cc size 2 stroke. That would be easier if you think it would work.
  15. FullSpool

    RC aircraft dyno

    The prop cools the engine, it also allows an easy way for me to start it.
  16. FullSpool

    RC aircraft dyno

    I have full throttle control through out the whole rpm range.
  17. FullSpool

    RC aircraft dyno

    RPM is easily measured as I already have that device, a hall sensor is mounted to the engine case and an earth magnet on the prop hub, as far as the assembly goes I have a shaft going through 2 pillow block bearings. 1 end of the shaft is connected to the engine mount and the other end of the...
  18. FullSpool

    RC aircraft dyno

    Wouldn't the wind conditions affect the prop readings? How many props would it take to get reliable data? So for each size engine I would need X amount of props, that could get expensive quick. Can someone explain to me how I would collect that data to usable HP ? Thanks for all the help thus...
  19. FullSpool

    RC aircraft dyno

    ummmmmm....... I suppose I could measure the torque via load cell that prop exerts. Im just not sure how much torque can be measured with that method or if it would give a stable data.
  20. FullSpool

    RC aircraft dyno

    I totally spazzed out on that I am sorry LoL.... Long day at work, I am looking for a different pump but having a hard time finding anything that I feel would be acceptable to act as a load control valve. I had the old used t70 turbo laying around the shop so thats why I thought about using it.

Part and Inventory Search

Back
Top