By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

Ben Buckle Falcon Build

All Topics | Latest Posts

Search for:  in Thread Title in  
Jason-I19/10/2019 20:30:04
260 forum posts
37 photos

My amazing wife just purchased this for me as a get well soon present. smiley

20191009_114711.jpg

Jason-I19/10/2019 20:31:11
260 forum posts
37 photos

It was ordered online. Colin Buckle sent this nice personalised receipt in the box....

20191009_114746.jpg

Jason-I19/10/2019 20:31:37
260 forum posts
37 photos

Build progress will follow.

Don Fry19/10/2019 20:50:15
avatar
4049 forum posts
46 photos

I've been thinking of building one of these. For the last 60 years. Got the plan. Got a set of wheels. Good luck.

Jason-I19/10/2019 20:57:22
260 forum posts
37 photos

I've been looking at it for some time too. Not quite as long as you though! My wife must have been looking over my shoulder, because I dropped no hints, it just turned up on the doorstep...

Jason-I21/10/2019 11:07:30
260 forum posts
37 photos

Components at the ready.

20191021_105546.jpg

Don Fry21/10/2019 12:12:06
avatar
4049 forum posts
46 photos

What motor/prop are you proposing to use.

Jason-I21/10/2019 12:38:37
260 forum posts
37 photos
Posted by Don Fry on 21/10/2019 12:12:06:

What motor/prop are you proposing to use.

I've picked up a 4250 500KV motor:

**LINK**

On 4s this should be good for 900w. I'll start off with a 15x7 prop and go from there.

I'm hoping to keep the build light, with all up weight less than 8lbs (hopefully less than 7lbs), so aiming for 100+ watts/lb

If I am struggling to get enough power on 4s, I will switch to 6s as the motor can handle upto 1350W.

As a backup plan, I am planning on positioning the firewall in such a position to allow a 5055 motor to be fitted if needs be. (i.e. if the build is overweight).

Don Fry21/10/2019 12:54:30
avatar
4049 forum posts
46 photos

Cheers. As an aside, the 100 watt rule does not REALY apply to the one speed free flight types. 50 to 60 is plenty.

Jason-I21/10/2019 13:11:54
260 forum posts
37 photos
Posted by Don Fry on 21/10/2019 12:54:30:

Cheers. As an aside, the 100 watt rule does not REALY apply to the one speed free flight types. 50 to 60 is plenty.

No doubt you are correct. I'm trying to 'guess' the minimum weight battery/motor combo I can fit to balance out the plane and produce enough power.

4-max recommend a 5055 motor for this plane, the 4250 motor I have selected produces the same power as the 4-max motor, but weighs a few grams less. (both are 500KV)

Chris Freeman 321/10/2019 13:25:41
273 forum posts
355 photos

Nice plane, they fly very well but the main wheels are very far forward which can make it hard to land as you have a lot of weight on the tail wheel, we built a double size one over 20 years ago and it kept on breaking the tail fin off in a ground loop.

Jason-I21/10/2019 13:59:16
260 forum posts
37 photos
Posted by Chris Freeman 3 on 21/10/2019 13:25:41:

Nice plane, they fly very well but the main wheels are very far forward which can make it hard to land as you have a lot of weight on the tail wheel, we built a double size one over 20 years ago and it kept on breaking the tail fin off in a ground loop.

Good to know. I'll make sure that area is strong!

Cuban821/10/2019 17:17:18
2758 forum posts
13 photos

I'm not really an aficionado of vintage models for myself, but many of my club mates are. Several have fallen into the trap of over - powering R/C conversions of classic free flight models (IC and electric) and have inadvertently suffered catastrophic wing failure when now able to fly in conditions that would have grounded the FF originals. The extra power and R/C does give the old 'uns a new lease of life, but beware of the light construction for FF when flying them more enthusiastically than they were intended for. If sufficient extra strength hasn't been added to the original structure (wing spars in particular), think seriously of doing so. Maybe this has already been considered with the BB kits, but I thought I'd just mention it. as it's heartbreaking to see lovely trad models break up when pushed a tad too far.

Good luck and enjoy the build and flying yes

Don Fry21/10/2019 17:29:43
avatar
4049 forum posts
46 photos

Cuban is tight. Light winds, a chair without arms, a mind in a state of calm. When I smoked, if I wanted a fag, I put the transmitter down to roll and light one.

You can liven it up. A circuit at 2 meters. A 60 meter roll on the touch and go. Careful use of very little power. There was a build thread on this site where a greatly enlarged Junior 60 got built. It stayed aloft on 10 watts a pound if memory serves.

Phil B21/10/2019 18:08:08
avatar
157 forum posts
150 photos

My Junior 60 will thermal with the motor off. Flies "backwards" in a light breeze on tick over. 3 cell Lipo and 30 Amp.

Jason-I21/10/2019 19:03:24
260 forum posts
37 photos
Posted by Cuban8 on 21/10/2019 17:17:18:

I'm not really an aficionado of vintage models for myself, but many of my club mates are. Several have fallen into the trap of over - powering R/C conversions of classic free flight models (IC and electric) and have inadvertently suffered catastrophic wing failure when now able to fly in conditions that would have grounded the FF originals. The extra power and R/C does give the old 'uns a new lease of life, but beware of the light construction for FF when flying them more enthusiastically than they were intended for. If sufficient extra strength hasn't been added to the original structure (wing spars in particular), think seriously of doing so. Maybe this has already been considered with the BB kits, but I thought I'd just mention it. as it's heartbreaking to see lovely trad models break up when pushed a tad too far.

Good luck and enjoy the build and flying yes

Thanks for the tips, I'll bear them in mind.

I'm only planning on flying this slowly and leisurely - and with the motor off as much as possible. Looking at the plan (which I have been looking at for a couple of years), it does seem over engineered for a free flight model, and as such more suitable for RC than most free flight designs. This will be my lazy Sunday sitting in a chair on a nice sunny day flyer. Besides, the attraction was as much about the build as the flying! wink

If on completion, I have over powered it, then I could always run on 3s instead of 4s or change the prop to tame it down.

Jason-I22/10/2019 12:07:00
260 forum posts
37 photos

Any thoughts about whether washout should be built into the wing?

Cuban822/10/2019 12:22:39
2758 forum posts
13 photos

I'm sure you'll be fine with the model if it's flown within reasonable power constraints and not forced to battle through windy or turbulent conditions or boredom sets in and you fancy some aerobatics (only kidding wink). Sounds like you have the right idea - nice and steady.

Build the wing as flat and as true as you can - with the dihedral of course - washout is not required IMHO.

 

Edited By Cuban8 on 22/10/2019 12:26:11

Don Fry22/10/2019 12:43:53
avatar
4049 forum posts
46 photos

No washout. These things give a minute's notice in writing it intends to stall, during which time you can let go of the elevator. They will sometimes stall, gently, if you abruptly turn to wind from slow speed, if you allow the nose to rise.

The only thoughts I have had about the structure is I reckon the fuselage formers aft of the wing TE could be replaced with depron, (optional,with some thin balsa stick glued on the faces), the wing ribs away from centre section ditto, the equivalents of wing ribs in the tail fin and tailplane, ditto.

Save a lot of weight, and nearly all aft of the CG.

Closed loop, Dacron, working the tail feathers, with the adjusters at the servo ends. Again get weight away from the back end.

I did some calculations once and I think it would remove about  200 to 300 grams of lead from the front. Because the solid iron lumps on the originals were heavy, that is a good thing. And 300 grams of  structural weight. That's 500 g plus,  for no loss of structural integrity.

.

Edited By Don Fry on 22/10/2019 13:15:22

Jason-I22/10/2019 13:34:41
260 forum posts
37 photos

Thanks for the info gents.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E! 

Latest Forum Posts
Support Our Partners
Wings & Wheels 2019
electricwingman 2017
Pepe Aircraft
Slec
CML
Gliders Distribution
Cambridge Gliding Club
Advertise With Us
Sarik
Latest "For Sale" Ads
Do you use a throttle kill switch?
Q: This refers to electric-powered models but do you use a throttle kill switch?

 Yes
 No
 Sometimes
 Rarely

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us