![]() |
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
|
#1
|
|||
|
|||
![]() |
#2
|
|||
|
|||
![]()
Daniel
On thread. The problem can be broken down into two sub problems. 1. The 'club' is a flywheel and used to absorb the firing impulses like a standard flight prop. Size can be back engineered as to weight to give the proper flywheel. Home made one should be out of proper wood, have proper hole pattern and front and back flanges to prevent crushing wood and of course balanced. Should be re torqued and inspected after each run. Should be run short runs until it has been qualified for long runs. 2. Engine is air cooled (unless it is Corky's water cooled auto conversion) and needs some cooling air which can be from the club or an external fan. Since a 'club' is normally short you can put a high pitch on it to blow air for cooling (you are not looking for flight efficiency). You do have to balance the pitch load against the power output at max throttle (and rpm). If a water cooled engine, you can use a radiator and cool via the 'club' air or other means. Even make a water heat exchanger (put radiator in a tub of water that you can let fresh water run in from your facet to keep a cool bath. to bleed off the heat). Hope these ramblings give Corky some ideas on what he can do (cheap and in house). One other thing he might do is check shops that rebuild engines and see what they use and where they get any device (club) and if he could rent or borrow for his tests. Also contact EAA to see what they have. Also go on Internet to other engine conversion groups and ask what they do to qualify their engine(s). Don't invent the wheel if you don't have to. Took a break and called around Houston with no success. One said to look in Trade-a-Plane which might be a good idea. Looked further on Internet and found data that says the club should be calibrated to let engine put out max horse power at WOT. They said that both Lyc and Con had bulletins about testing (they wouldn't apply directly to Corky's engine but might give him some ideas of what should be done and how? Also if a auto speed shop with a dynamiter (sp) is available, use it to document rpm, torque, etc. before reliability runs on test stand in his shop. Have at it Corky and keep us informed how things turn out. Big John On 14 Nov 2003 05:28:53 -0800, (Daniel) wrote: (Corky Scott) wrote in message ... I'm looking for a club prop I can use to break in/test an engine. I could use a regular prop I suppose, but the engine will be on a test stand and I'd rather have something with a reduced diameter for safety. The engine will be producing around 180 to 190 hp and I'd like to be able to run it up to full power/rpm for extended periods. Maximum prop rpm will be 2400. The prop hub has a standard bolt pattern. Any ideas? Suggestions? Thanks, Corky Scott Lots of OT responses, which is OK, but I'd like to hear an on topic answer to how one sizes an appropriate club for any given engine. Anybody have an answer? Daniel |
#3
|
|||
|
|||
![]()
Daniel wrote:
(Corky Scott) wrote in message ... I'm looking for a club prop I can use to break in/test an engine. I could use a regular prop I suppose, but the engine will be on a test stand and I'd rather have something with a reduced diameter for safety. The engine will be producing around 180 to 190 hp and I'd like to be able to run it up to full power/rpm for extended periods. Maximum prop rpm will be 2400. The prop hub has a standard bolt pattern. Any ideas? Suggestions? Thanks, Corky Scott Lots of OT responses, which is OK, but I'd like to hear an on topic answer to how one sizes an appropriate club for any given engine. Anybody have an answer? Daniel I would say trial and error would be the easyest way. Start big and shave down until you get your 2400 RPM at WOT. John Roncallo |
Thread Tools | |
Display Modes | |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Right prop, wrong prop? Wood prop, metal prop? | Gus Rasch | Aerobatics | 1 | February 14th 08 10:18 PM |
Wooden Prop | minot piper e | Home Built | 1 | October 26th 03 11:39 PM |
website for Warp Drive prop pls | John Freeman | Home Built | 4 | October 14th 03 01:39 PM |
want variable pitch prop | Ray Toews | Home Built | 5 | October 7th 03 09:59 PM |
Metal Prop vs. Wood Prop | Larry Smith | Home Built | 21 | September 26th 03 07:45 PM |