Jump to content

Attention: RC-CAM.com will be closing down August 2021.

The RC-Cam.com forum was the very first online community dedicated to the advancement of wireless video cameras on radio controlled (R/C) models. This is now called "FPV" (First Person View). We are proud of the contributions that our members have made to the FPV hobby.

We've seen significant changes over the last twenty years. Initially there were a lot of eager R/C hobbyist that built their own video systems. Allowing these creative individuals to share their work was the purpose of this site. Now the FPV market is flooded with low cost systems; Sadly DiY FPV video projects are now rarely discussed.

RC-CAM.com (main site and forum) will be closing down August 2021. This is being announced now (March 2021) so that everyone has time to download any information that is important to them. After the site is shutdown the information will no longer be available here.

We appreciate every member's involvement with advancing the FPV hobby. It is indeed sad to say goodbye to all our online friends. Be safe and stay healthy.



wing area of a bi-plane


Recommended Posts

YES, it maybe the answer you are looking for. I have used a biplane in very tight places where slow speed and tight turning was needed above ultimate duration.

I think from memory that 2 wings when used as a biplane equal about 1.5 wings and you need to mount them not closer than 2 cord lengths apart if you can help it.

Thats the basics but it can get very involved if you like to argue the t***!

Let us know how you get on.

Terry

UK

Link to post
Share on other sites

From my experience, bi-planes tend to have a lot of drag. Ever have to bring one in with a dead stick? They sink like rocks!

Personally I don't think they would make a good plane for any payload.

A trainer is a much better bet. I've put 4 pounds in my 40 size trainer.

Admittedly it also became a sinker... but it still flew quite well.

Also the flat bottom and dyhedral in the wing give it some nice qualities for autopilots and RPV'ing.

I've also use a Modeltech Cessna 182 model... I fly it with 10% flaps with a heavy load in it and it does quite well.

My main "Carrying" machine is a Senior Telemater. It can handle a lot of weight, but considering it's a kit (not ARF) and the flight charateristics are only so so, I don't think I would bother with one again. I would simply look for a 60 size trainer ARF.

Edited by mikep
Link to post
Share on other sites

Mikep,

I'm kind of a bipe nut. It has been my experience that Bipes tend to carry alot of parasite drag which makes the excellent candidates for radical aerobatics -- downline braking is incredible. Thus the tendency to fall out of the air like a brick.

There are a few things you can do to improve the parasite drag situation though. First, try to build it out without flying wires. The flying wires tend to create turbulence in the decalage area and reduce the lift of the upper wing. Also, a slight amount of negative incedence on the upper wing (about 1-2 degrees) also causes the pressure between the upper and lower wing to be reduced making the wing area more effective. Finally, if you must use a bipe choose a model with a stagger configuration.

Some candidates that I have found to be have these characteristics include the Waco, Great Lakes, and Hog. Stay away from the Ultimate, Pitts, Weeks, and Stearman if you want payload.

If you are looking for a good ARF trainer that does a great job of carrying payload. Try the Frontier Senior ARF. It is built very light and and a .91 OS or Saito 100 will pull this thing all over the sky. I have used one as a paintball carpet bomber. You can pretty much fill up the fuselage with paintballs and the thing just keeps flying.

Robert

Link to post
Share on other sites
  • 4 months later...
  • 9 months later...

Aspect Ratio ( the w.s. divided by the chord) is very important in calculating lift.

If we had to wings that would fit on the one airplane.....and say the area was 1000 sq in in both wings but one wing had a chord of 10 in and a w.s. of 100 in while the other wing had a chord of 15 in. and a w.s. of 66.6 in which would give you more lift? I use the absurb to make a point.

The 100" span with chord of 10 " would give much more lift than the 66.6 in span and a chord of 15 in. Of course Reynold's Numbers do factor in. That means air speed, etc. So if both of those wings flew at thew same speed ( say 40 MPH) the one with the higher Aspect Ratio will lift more.

The 100" wing had an A.R. of 10 and the 66.6 " wing had an A.R. of 4.4! Just a little thought. The A.R. of a piper J-3 is about 7 to 1 or 7.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...