You are right, theoretically, that one cannot make a transition from a cone to a cylinder with one piece of balsa. However, the taper is very small and balsa can be forgiving. I think it can be done. In fact, many years ago, we made motorsticks with tapered ends, but straight in the middle. They looked fine and worked well. This is exactly the case being considered.
Thanks for your input on boom forms.
Ray
--- In Indoor_Construction_at_yahoogroups.com, "Slobodan Midic" <slomi@...> wrote:
>
> I think it's not possible to bend balsa cylindrical and conical in the same time, because in the transition place one part of balsa mast elongate the other part must shorten.
>
> For me the existing form is OK. I build my boom for F1D on your form 440 mm long (17.3") with taper from 0.25" to 0.1". I have integrated motor stick with an cylindrical extender of 4" of same diameter as motor stick, but thinner and lighter.
>
> SloMi
>
> ----- Original Message -----
> From: ray_harlan
> To: Indoor_Construction_at_yahoogroups.com
> Sent: Wednesday, December 02, 2009 2:40 PM
> Subject: [Indoor_Construction] Re: Tailboom Forms
>
>
>
> I would guess that you want the straight 2" section to slide over another short section of boom to make something longer than 18". If so, I would argue that a taper is a much easier way to get a solid friction fit than with a straight section. The tolerances for fit are a lot looser. It isn't difficult to put a short taper in the straight front section to fit the tapered boom. Even if the tapers don't match exactly, there will be enough friction to hold the boom and tail from twisting in flight.
>
> Ray
>
> --- In Indoor_Construction_at_yahoogroups.com, Nick Ray <lasray@> wrote:
> >
> > I like the conventional form, Though I have a different idea for a new form.
> > What about doing an 18" form with the first two inches d=.25 then have the
> > tapper go from d=.25 to d=.1 over the remaining 16 inches?
> >
> > NR
> >
> > On Tue, Dec 1, 2009 at 4:06 PM, Benjamin Saks <bensaks_at_> wrote:
> >
> > >
> > >
> > > Max and I were talking about the tail diameter for the boom and both
> > > thought that larger is better on these new planes. I have difficulty making
> > > use of the boom at that small a size to attach the horizontal stabilizer
> > > posts to. I would like to see a boom with a small end diameter of .100" or
> > > even .110"
> > >
> > > Any other thoughts?
> > >
> > >
> > >
> > >
> > > On Tue, Dec 1, 2009 at 3:43 PM, ray_harlan <rbharlan_at_> wrote:
> > >
> > >>
> > >>
> > >> Sometime in the next two months, I'll be making a batch of tailboom forms,
> > >> since I'm out of them now. I thought it would be a good idea to survey F1D
> > >> fliers to see if they would prefer a different taper than my heretofore
> > >> standard of .25" to .092" dia. over 18". I doubt any F1D models have this
> > >> small a diameter at the tail, yet most are 18" long. So, let me know what
> > >> works well for you. Most models are close in design, so any size I pick
> > >> should be close enough for everyone.
> > >>
> > >> I will make a batch of the new taper and drop the old one.
> > >>
> > >> Ray Harlan
> > >>
> > >>
> > >
> > >
> > > --
> > > BEN SAKS
> > >
> > >
> > >
> >
>
Received on Thu Dec 03 2009 - 14:00:35 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET