Dudley, I am not a mail spammer, what happens is that for bussines purposues I have set up my mail program to always request acknowledge and sometimes I forget to disable it when I post to RCSE.
If you are using Microsoft outlook or Outlook Express, you also can set up as default not to answer and or not inform you about it. have a nice day -----Mensaje original----- De: Dudley Dufort [mailto:[EMAIL PROTECTED]] Enviado el: lunes, 26 de agosto de 2002 9:13 Para: Oscar Taboada Asunto: Re: [RCSE] How much power for the winch? Oscar, turn off your receipt request. The constant "reply request" attached to your messages is getting on my nerves. Why are you collecting e-mail addresses? Are you a spammer? Oscar Taboada wrote: > I am not sure about the meaning of "real balls".. > but maybe I have them : > I have one bearing at each side of the drum and a flexible conection > between the motor axel and the drum axel > > is that what you mean with "real balls"? > > thanks everybody for your comments > > -----Mensaje original----- > De: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Enviado el: viernes, 23 de agosto de 2002 18:30 > Para: Oscar Taboada > CC: [EMAIL PROTECTED] > Asunto: Re: [RCSE] How much power for the winch? > > Sorry to hear about the broken Windfree. Great plane, a > little weak in the joiner department, tho. > Is your winch too powerful? Hmmm..... > > Let's se now, We have a Chevy truck starter motor, > mystery P/N of UNKNOWN power. Maybe less, maybe more > than the good ol'Ford LS motors we use so often. > > You are right about the smaller (2") drum size producing > more torque and less line speed than a larger (3") drum. > This is not a bad thing or a good thing. It's like > asking if 2nd gear is better than 1st gear. > You are also right that the line has a lot to do with > it. Nylon is stretchier and more forgiving than other > material like Dacron, Spectra, or steel. Monofilament > has even more stretch. (mi gusta!) > > The Windfree is notorious for having a lightweight wing > joiner system. It is wimpy by today's standards. > You expert friend was probably used to a different > winch. A lot of us go by how the motor sounds, THIS IS > VERY IMPORTANT!! and everybody knows that Chevys sound > different than Fords... > > During his launch, you mentioned that he stopped running > the winch for 2 or 3 seconds, then got on it again. This > could easily put undue shock on ANY wing and cause it to > fold up. > > You can easily measure the RPM of your winch with an > optical tachometer. (power guys have these) These > tachometers have a photocell in them and you point it at > the spinning propeller. The photocell counts how many > times the beam sees a dark line.(the prop blade) Just > put a strip of black electrician's tape on the drum to > fool the tach into thinking it is looking at a > propeller. Launch your sailplane as you usually do, and > have your lovely assistant take the measurement with the > tach. You will find that the RPM will change at > different parts of the launch. > > Most of the AMA style winches in the US use the Ford > Longshaft motor driving a 3" diameter hub. I am not sure > how 3" was decided, but that's what we will find at the > LSF NATS, as well as most all of the major contests on > both east and west coast. I have built a few custom > winches with smaller and larger hub diameters, and it > has been my observation that the smaller 2" hub works > just fine, perhaps drawing less current per launch. The > Ford motor with no load turns about 3800 RPM (4200+ > with "Real Balls")and a 3" diameter drum shows between > 750rpm and 2000rpm during a typical launch. This > suggests that the motor is loaded down plenty. If I were > to put a 2" drum on the same motor and launch the same > way, the overall RPM would be increased, and the current > draw would be less. It would also SOUND DIFFERENT!!! > After you determine your launch RPM, you can easily > calculate your line speed. RPM X circumference of drum. > This will give something to compare. > > Good thing your motor didn't have "Real Balls"!!! > > Doc > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Dudley Oscar Taboada wrote: > I am not sure about the meaning of "real balls".. > but maybe I have them : > I have one bearing at each side of the drum and a flexible conection > between the motor axel and the drum axel > > is that what you mean with "real balls"? > > thanks everybody for your comments > > -----Mensaje original----- > De: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Enviado el: viernes, 23 de agosto de 2002 18:30 > Para: Oscar Taboada > CC: [EMAIL PROTECTED] > Asunto: Re: [RCSE] How much power for the winch? > > Sorry to hear about the broken Windfree. Great plane, a > little weak in the joiner department, tho. > Is your winch too powerful? Hmmm..... > > Let's se now, We have a Chevy truck starter motor, > mystery P/N of UNKNOWN power. Maybe less, maybe more > than the good ol'Ford LS motors we use so often. > > You are right about the smaller (2") drum size producing > more torque and less line speed than a larger (3") drum. > This is not a bad thing or a good thing. It's like > asking if 2nd gear is better than 1st gear. > You are also right that the line has a lot to do with > it. Nylon is stretchier and more forgiving than other > material like Dacron, Spectra, or steel. Monofilament > has even more stretch. (mi gusta!) > > The Windfree is notorious for having a lightweight wing > joiner system. It is wimpy by today's standards. > You expert friend was probably used to a different > winch. A lot of us go by how the motor sounds, THIS IS > VERY IMPORTANT!! and everybody knows that Chevys sound > different than Fords... > > During his launch, you mentioned that he stopped running > the winch for 2 or 3 seconds, then got on it again. This > could easily put undue shock on ANY wing and cause it to > fold up. > > You can easily measure the RPM of your winch with an > optical tachometer. (power guys have these) These > tachometers have a photocell in them and you point it at > the spinning propeller. The photocell counts how many > times the beam sees a dark line.(the prop blade) Just > put a strip of black electrician's tape on the drum to > fool the tach into thinking it is looking at a > propeller. Launch your sailplane as you usually do, and > have your lovely assistant take the measurement with the > tach. You will find that the RPM will change at > different parts of the launch. > > Most of the AMA style winches in the US use the Ford > Longshaft motor driving a 3" diameter hub. I am not sure > how 3" was decided, but that's what we will find at the > LSF NATS, as well as most all of the major contests on > both east and west coast. I have built a few custom > winches with smaller and larger hub diameters, and it > has been my observation that the smaller 2" hub works > just fine, perhaps drawing less current per launch. The > Ford motor with no load turns about 3800 RPM (4200+ > with "Real Balls")and a 3" diameter drum shows between > 750rpm and 2000rpm during a typical launch. This > suggests that the motor is loaded down plenty. If I were > to put a 2" drum on the same motor and launch the same > way, the overall RPM would be increased, and the current > draw would be less. It would also SOUND DIFFERENT!!! > After you determine your launch RPM, you can easily > calculate your line speed. RPM X circumference of drum. > This will give something to compare. > > Good thing your motor didn't have "Real Balls"!!! > > Doc > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
