David

The instructions for the aileron deflection state "up" is twice "down". I thought I could achieve this by offsetting the servo arm on the servo drive - but the calculation shows that it would have to be offset by 39deg. This would make the 45 deg "swing" of the arm go from 39 deg to 6 deg the other side of vertical in one direction , and from 39 deg to 84 deg in the other. 84 deg is obviously an impractical position for a servo arm - so are there any other ways of achieving differential aileron if your transmitter does not have a "diff" facility?

I have since found that FLAIR make scale wheels for WW1 aircraft - they are not spoked but have solid plastic centres with large tyres. This is ideal for me since the particular aircraft I am modelling (belonging to the ace Capt Stuart Harvey Pratt) had wheel covers with red skull & crossbones on them. SO thanks to all who replied but I am now sorted. I am going tothe RAF museum tomorrow 31/1 to ake photos and measurements. David Woodward

I think I remember an RCM&E article about making scale wheels for planes like the Pup. Can anyone pint me toit or suggest how to make or buy them? David Woodward

Hi Danny   I think you have mis-understood what I was describing. With this method you can curve the sheet to the correct curvature before gluing it to the fuselage so there are no stresses left  in the sheet as it is attached.  

Often one is told to wet the outer surface of the sheet and then ease it round the curved surface. I find it much easier to put two layers of ordinary brown parcel tape on the outside. This stops the sheet from splitting when being folded round the surface, and the curve is obtained by compressing the balsa on the inside of the curve. This allows the required curve to be obtained before gluing to the fuselage formers. You may get a few ridges but these are easily sanded away when the glue has dried

The poor thing is under-powered. You need to get the watts up to 600 at least at full throttle. this willl mean that the current then is at least 46 amps. Your ESC is OK with this - but your battery may not be. A 20C battery would need to be at least 2500mAh. The next problem is to increase the prop size to extract the extra power - and you may run into prop clearance difficulties - I would suggest that you will need a 13 x 8 or may be a 14 x 8 to extract the extra power.   However, if you go to 6s1p that would increase the revs and almost solve the problem - provided your battery capacity is adequate as above.

For David Ashby (or anyone else who knows)  I cannot understand the figures given in david Ashby's latest Product Review on brushless outrunners. 1) None of the RPM figures come close to Volts x Kv 2) Why would a 2.5cc ic engine only turn an 8 x 4 prop at 3,300 RPM? 3) Why would increasing the Kv from 1120 to 1600 produce a DROP from 8,000 rpm to 5400 on a 9 x 4.5 APC prop for an electric motor equivalent to a 2 cc ic engine? There appear to me to be many other anomalies in the figures - so are they all wrong or am I missing something? David Woodward

I could do with this - my Arising Star is getting long in the tooth & I still haven't got my "A"

We all keep trying - but so many try that the chances get slimmer - but I don't!

Oh yes! A Piper Cub for me? I hope so!

I have just been trying to access the website quoted by David Ashby in his article on Airbrushing. It would appear that the quoted web address is wrong. "airbrushin.co.uk" is a web domain thatis up for sale and encompasses a number of "arty" web sites. The correct web address for The Airbrush CoLtd is "airbrushes.com" The article was very useful and informative. Thank you for undertaking the research.

I would really like towin this one

Peter Miller  I am stillhaving trouble sourcing all the items shown on the plan. Where do I find control horns like the ones shown for the ailerons? Where do I find Radioactive servo mounts? I have tried most of the major retail web sites without any success - my local model shop does not have either of these. David

Thanks for the info - it helps a lot

I want to build the Tipsy Junior - is anyone else building one? If so:- a) What have you done about fitting the throttle servo? The plan shows the route and location of the elevator & rudder servos, but does not show the throttle servo. b) How have you set up the aileron servo? The plan shows clearly the two bellcranks for the ailerons but does not show the aileron servo or the connection of the spanwise wire to the aileron servo.