SLOPING OFF...

...Christchurch and District Model Flying Club’s Magazine RTP Special

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ROUND THE POLE FLYING

After the very enjoyable evening of the March Club Night and the demo by Trevor and Roger of the Club’s RTP, Bill Glover got in touch with a trove of his models from his time as Comp Sec of Woking MFC. So as to build on the interest shown on the night, Here’s a Sloping Off Special - just one page - it won’t take long to read! All photos and notes on the models are by Bill.

rtp2

rtp1

rtp3

1-3 are the Tilt Wing model, built to win the fast/slow element of the RTP competition. With the wing flat  it flew like a bat out of hell, and with it at around 80 deg it flew at a slow walking pace. Large amounts of sidethrust and some tip weight were required to keep tension on the lines at low speeds. It was also prone  to tipping back on takeoff which made it stop dead - hence changing to a 'skid' undercarriage which prevented this. It balanced on the wing  leading edge (an aluminium tube, with the power cables inside) so there  was no CG shift when the wing tilted ... there was a brass collet on a  nose boom for fine tuning the CG. Like many of my models it used 1/64  ply strip wrapped around a motor a couple of times to form a laminated  push-fit motor mount that then became part of the structure.

rtp4

rtp5

4 and 5 are an EDF foamie! I took an old hairdryer apart and found a  normal brushed motor inside. I cut the body of the hairdryer down to a  basic duct then added a tailpipe with a flow restrictor at the back, cut from a plastic bottle. This increased the static thrust significantly.  The wing was flat polystyrene foam covered with solarfilm, balsa fins  and elevator (hinged with copper wire and positioned in the exhaust to  improve effectiveness at low speeds). Like most deltas this would fly  slowly at high AoA, but with the elevator neutral and the highest  voltage on our transformer unit (46V?) it was a complete beast. It had a tricycle landing gear and after landing took several full laps to slow to a stop. The tether was bolted to the duct for safety but the pole rocked from side to side in an  alarming manner and people tended to hide behind tables when I flew it!

rtp6

6 is a basic model I made for a large brushed motor ... this had LED  lights but of course they went out when you cut the throttle!  Nevertheless it was fun to fly in the dark.

rtp7

7 is a Ballards Sopwith Camel. The tailplane sat in a curved slot and  could be slid fore/aft to increase/decrease the camber, giving a wide  range of elevator control. A very nice flying model (they also did an  Albatross - I think these may still be available from the RTP Hut). It  was the only model that could loop in the British Legion hall we used.

rtp8

8 was my main competition model - it was pretty much invincible! Balsa  wing with a rolled ply motor mount, the wheels were servo disks and the  'outer' one was fixed to ensure it maintained line tension on the ground (some of the competition events required a landing/stop/takeoff in the  middle). The wheels protected the prop so touch & gos could be done  at high speed without any risk. Tinplate rudders and copper wire hinged  elevons (which in fact were never moved). This model was built around a  standard (cheap) Ballards motor that was mandatory for all events where  power & speed were important.

rtp9

9 was a pure speed version from very thin ply.

rtp10

10 was a combat version (we had a dual pole), all ply again but with the  motor rubber-banded on and a lithoplate elevator protected between the  fins. This was essentially indestructible.

rtp11

11 was a Veron 'Quicky' series Fairey Firefly, intended for rubber power.

rtp12

12 was a KeilKraft EeZeBuilt Piper Comanche, again intended for rubber power. This flew very nicely and looked good in the air.

rtp13

13 was a KeilKraft EeZeBuilt P-51. This flew very realistically with the flaps down ... home made balsa spinner.

rtp14

14 was built for a 'slow flight' competition which involved doing 10 laps  in the longest time. This used tissue covered KeilKraft Ajax flying  surfaces (undercambered wing) on a lightweight balsa stick fus. and used the smallest and lightest motor I could find ... an aluminium can one  from an old servo. Intended for 5V this produced way too much power with the hand controller on its lowest setting so I made a deliberately  inefficient prop from a strip of tinplate soldered to a small brass  collet and twisted the blades till it gave a comfortable amount of  thrust. This model was trimmed & balanced to fly 'properly' and  would glide gently down the hall from a hand launch. For RTP it was  trimmed to circle and flew very slowly with the lines quite slack.

rtp15

15 was another all ply combat model with a banded-on wing and motor.

rtp16

Finally 16 was a KeilKraft Luscombe Silvaire (tissue covered), originally free flight with a Telco CO2 motor. For RTP it flew (very nicely) using a small servo motor with cooling holes drilled through the aluminium can.

 

Competition events I can remember offhand were ...

Scale

Touch & gos - in a zone marked out with masking tape on the floor

Spot landing - strip of tape as the 'spot'

Pylon racing - as many laps as possible in a set time, including a 'pitstop'  (come to a halt on the floor then go again) at some point

Under & over - two lightly constructed bars on opposite sides of the  circle .. as many passes over one and under the other on the same lap  (without touching the floor) in a set time

Slowest flight - 10 airborne laps in the longest time (without touching the floor)

Fast & slow - 10 slow airborne laps, 10 fast airborne laps, score was  slow time minus fast time. Nothing to be added or removed between the  flights but trim / incidences / etc. could be adjusted¬ 

Combat - thin paper streamers, 1 point per cut. A demolition derby with 'normal' models! Lots of line tangles.

 

I was the competition secretary for many years. The club met every Friday night once BST finished and RTP was a default activity when there  wasn't another event scheduled. The competitions were held on specified  dates of course.

I flew my Mini IFO successfully inside the hall but it was way too small  for normal indoor r/c. The club hired a school sports hall every week  for that in later years, eventually using this to run the funds down to  zero after the decision to wind the club up.