Bar Flea (oz2406)

 

Bar Flea (oz2406) by John Knight from RCME 1970 - plan thumbnail

About this Plan

Bar Flea (Bar-Flea). 40 in span lightweight aerobatic model for 4 channel RC and .15 to .19 engines. Direct contribution to Outerzone.

Update 22/06/2020: Added article, thanks to RFJ.

Quote: "Your FREE plan for another mini-multi R/C model. Bar Flea, by John Knight

If Phil Kraft's Kwik Fly (oz7431) can be scaled down to Flea Fli (oz7210) size, then why not the Bar-Fli (oz5544) too? Such was the thinking that led to the creation of Bar-Flea - and it works!

This is not a beginner's model, quite the reverse in fact, since this little number really demands reason-able experience with acrobatic type R/C multi models and good reflexes. Prototype No.1 died early through my own incompetence - inverted at 30 ft, and applied up elevator instead of down - ouch. (Rather bad habit for serving RAF pilot - Ed.) No. 2 model was shot down by interference (monitored American voice transmission).

Both models used K&B 19 R/C power, driving an 8 x 8 in nylon prop. Running on KK. Nitrex 15 fuel, both prototypes would hold pace with a 61 powered Thunderstormer (oz9052) straight and level (to coin a phrase Mr Russell), which in my estimation corresponded to a speed of about 80 mph, so this little fella doesn't exactly drag its heels.

Construction is pretty straight-forward but here are a few useful pointers which may help. To help keep the weight as low as possible, balsa replaces ply in many places where the latter is normally the accepted material, for instance, the dihedral braces are balsa and I've never had a failure yet using balsa instead of ply here. Undercarriage blocks are not grooved - 10 swg mainlegs are clamped on with Micro Mold nylon saddle clamps. Even in the write-off of model No.1, the main gear was in one piece and installed in model No.2.

If you like, you can use 1/16 ply all the way along the tank bay floor - the ply is to stop the nose wheel entering the fuselage on a good 'bounce'. You might also try putting 1/8 sq strips along the inside of fuselage bottom corners aft of the wing to allow rounding of the bottom of the fuse. Dowel and rubber band wing fixing is, obviously, an alternative to the nylon bolt type shown.

Radio installation must, naturally, be arranged to suit your equipment. My models used Bonner RS radio, but the Kraft KPS-I0 servos shown on the plan are typical of modern lightweight radio installations. In any case, your arrangement must be made to preserve correct balance and on mine, the power pack was situated vertically behind F3, elevator and rudder servos in front of F4, with the Rx between DEACS and servos. (All set for a nice transistor sandwich in the case of a prang, but in the little ones, your options are limited - Ed.) Motor servo was fitted between F2 and F3 because I build nose heavy!

Finally, limit the aileron and elevator travels to 1/4 in up and down initially, and in the case of the ailerons, afterwards too! I doubled the aileron movement on No.2 model which produced a roll rate like an RAF Gnat jet trainer, but it was just not comfortable to fly.

With the Bar-Flea, you get only 317 sq. ins. of wing area and any extra ozs tend to up the wing loading much more dramatically than on the big machines, so watch it. Aim for a weight of 24-21 lbs - mine was 2 lbs 14 ozs."

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Bar Flea (oz2406) by John Knight from RCME 1970 - model pic

Datafile:

Bar Flea (oz2406) by John Knight from RCME 1970 - pic 003.jpg
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Bar Flea (oz2406) by John Knight from RCME 1970 - pic 004.jpg
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Bar Flea (oz2406) by John Knight from RCME 1970 - pic 005.jpg
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Bar Flea (oz2406) by John Knight from RCME 1970 - pic 006.jpg
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Bar Flea (oz2406) by John Knight from RCME 1970 - pic 007.jpg
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User comments

Hi Mary/Steve. I hope you are both well during the current craziness and so glad you're keeping up the good work on the Outerzone collection. It's much appreciated. I thought you might like some photos of my rendition of John Knight's Bar Flea [main pic, 003-007], built from the original free plan, which, despite being printed on the cheapest orange paper I've ever seen, still survives 50 years on!
My version started as a trike as per the plan, but was subsequently converted to a tail dragger after the failure of a 3D printed plastic main undercarriage mount experiment! Ground-handling is fine on our club grass strip.
I didn't have a suitable commercial canopy to hand, so carved a plug and hand pulled some acrylic sheet to shape with help from a heat gun. A carved and painted balsa pilot is installed, to blame for any dodgy landings!
The AP 12 motor shown in the pictures was a bit unreliable, so has subsequently been replaced with an OS 10 FP, which, despite being half the size of the original spec'd motor, powers the Flea through manoeuvres very adequately.The thick wing slows the model down nicely for stall-free landings.
The colour scheme is courtesy of Solarfilm, with the mid blue undersides showing up remarkably well, even against a clear sky.
With best regards,
RogerT - 22/06/2020
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Notes

* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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