Re: seeking some F1D tips?

From: Timothy Chang <mitim3_at_sbcglobal.net>
Date: Tue, 13 Mar 2007 17:46:50 -0700 (PDT)

Hi Ignacio,
  When I first started F1D I was also getting around the 18-20 min mark. Here are a few things which the F1D "pros" pointed out to get the plane to competition spec.
  1. Check your spar deflection- Your spars need to be pretty strong as if they are too soft, they will deflect too much causing the plane to climb a lot less than it really can. If you are already hitting the ceiling anyway, then soft spars may actually help a little. On indoorduration.com theres a whole article about F1D type props by Steve Brown.
   
  2. Rubber- I think its one of the most important aspects. If you don't have the super rubber (5/99, 8/93, etc.) then the times over 30 min can be difficult to achieve. You said you were only getting around 1000 turns at .35 in/oz.? What size rubber are you using and what batch? At Kibbie Dome last year, 5/99 .049-.050 x 9.4"-9.5" was getting about 1600-1700 turns at a max torque of about .45-.47 in/oz.. The good stuff has a huge difference.
   
  3. Check your downthrust (especially during launch) and your thrust line. If you have too much, the plane won't go anywhere. Typically, having no downthrust without the stress of the rubber is pretty good. If the plane stalls on launch, you can adjust the tension of the bracing wire so that the rubber tension makes the motorstick bow a little- adding downthrust.
   
  There's a lot more things to look for when flying F1D or any other class of planes, but these steps may help to increase your time!
  Hope this helps and ask questions if you have any.
   
  Tim Chang

izgo <izgo_at_yahoo.com> wrote:
          
Hello

I have some problems with F1d and I will apreciate some
advice...

Flying in a CAT III (25 meters; 82 feet) with good air best times are
arround 18 minutes and very few times on 20 minutes.

Whay I whant is to improve times, Im far from the times you guys are
doing. But where to start? Im not sure if is a problem of a "draggy
model" or I'm geting a bad prop/rubber combination.

I have seen some post where the turst for a level flight was computed.
How was done that? It will be very nice to find how much trust my
model need for a level flight.

Usually I load 1000/1100 turns and 0,28/0,29 oz-in. It seems
impossible for me to reach values like 1500 turns 0,37 oz-in some of
you are handling. DO I have to break-in more harder the rubber?

Well, apreciate any recomendations and please forgive me if im
repeating questions already replyed.

Tnx, Ignacio.



         


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Received on Tue Mar 13 2007 - 17:47:26 CET