John Gleeson

Posted by Pete B - Moderator on 10/11/2016 15:31:33: Hi John, Just found your post from 2014 regarding flaps on the Cub - I see you build as the same sort of speed as I do... I've refreshed my memory from my original build thread and the motor info is towards the foot of the first page. Finally settled on a 4250 700Kv on a 5S 4000mA pack, with a 12x8 prop. 5S is, I've found, of limited use across my stable, so you may want to consider either 4S or 6S, with a suitable adjustment to prop size. With a 60A ESC, a bit of experimenting with props and 4S should be OK Pete Hi Pete I have bought an EMAX GT3526/05, 60A ESC, an Overlander 4S 5000 mAh 35C/65C battery and a 12 x 8 prop, eCalc seems to think this OK, but I'm not sure what all of the data means. What do you think? I'm having second thoughts on putting flaps on it at the moment because of the extra weight of the servos, too much change too soon maybe. John

I've just taken a look at eCalc which may answer some of my questions although it does look at first glance somewhat complicated.

Pete, many thanks for your responses, your build thread looks great and I will be following your ideas regarding the servo layout. Is the unit on frame at the rear of the cockpit the receiver? Never having ventured into electric flight I feel like `i have opened a can of worms . I have found a number of very informative sites regarding LiPos and there safe use etc, but how does the power train all fit together. I'm thinking here of location and weight distribution. Is the ESC on your build under and behind the motor? Yet another question I notice that you mention the Emax BL3526/05 685Kv with 60 ESC, what battery would I need with that combination and what sort of duration would be likely? Many thanks in advance for any advice I do feel a bit out of my comfort zone here, and do not want to make any costly mistakes. John

Many thanks guys for your helpful and quick responses. I am going to review them and hopefully I will be able to proceed based on them., I will keep you informed.

Hi, I have a Goldberg Cub 78inch wingspan that I built some time ago but never got round to fitting the 4 stroke motor that I originally intended to use. I now want to go down the route of electric power but have no idea as to what size motor, esc or batteries to fit. In fact help avoiding the pitfalls that this may entail would also be useful. I would really appreciate any constructive advice that might be offered to help me achieve this. Many thanks. John

Hi Pete/Simon Many thanks for your comments. My original idea was to fit some form of air brake in order to slow it down some more. My problem on my old Cub which I think I had 0.40 two stroke engine, when this was on tick over at the slowest I could make it, the Cub continued to float. I don't think having said that, the engine was actually providing thrust as the sound of the air passing through the prop was very noticeable. Most probably it was my lack of landing skills and approaching too fast, although as I recall I did try and approach as slow as possible. The outcome will become clear when I try varying degrees of flap/brake, at height of course. ;0) John

Hi, I am in the process of building a Cub and am after a bit of advice. When I built and successfully flew my last Cub 20 years ago, I remember the one thing it did not like doing was landing where I wanted it to. It would float on and on. This time I wondered if I was to convert part of the ailerons to flaps if that would indeed slow it down and encourage it to descend at a controllable rate. the ailerons are 61 cms and the flaps would be 17 cms. Can anyone tell me if these sizes seem reasonable. I would not really need to shorten the aileron more than 3 cms if at all. Hope someone can help.