Tony Kenny
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Everything posted by Tony Kenny
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I'll try it out soon and post back on results. This thread and my previous questions about design books have got me thinking now that I'll try and make a whole RC model from pop bottles! Worth a go even if just to try some techniques and see if I understand the books
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Looks good, which sim is this?
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In wish case, I'll shape it on my baby's bum! Failing that, I'll use a fine grain emery for the finish. Come to think of it, I'll use this same method to make a new front end too which will save some fibre glass work, I'm assuming I can sand the plastic rough and it will take paint, or leave it smooth and use solar film?
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I have a WISE stabiliser unused in a previous model and after reading this month's RCME, I'm thinking of putting it in a new plane before flying it the first time. But, the plane is a delta. Having no manual for the device and nothing on the manufacturer's site, is it possible to connect up this stabiliser to work on a delta?
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fantastic, thank you, i'll get this bottle of D&B finished off then and need to get a plug shaped up. I'll see what I've got lying about and hope to get this ready for the Great Orme! I supposed it won't be the end of the world if I don't have a nice canopy, so long at the plane stays together.
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In this old plane I'm renovating, the canopy was smashed so I need to create a new one. My "plan", not being experienced in the workshop, is to build up a block of balsa, sand it to shape and then try to find some sort of clear plastic that I can warm with a hot air gun and try to get it to conform. Does that sound like a reasonable plan? Is there a particular material that might be able to do this? Thanks in advance! again!
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OK, i did it. Due to some previous repair underneath the fuz, I decided not to take the risk of weakening it further in that area and instead chose to cut around the cockpit so the line would be less obvious and it gives me easy access from the top so it feels a bit safer. I've also created that external battery isolation plug with deans connectors. I intend to ad some ply to replace the strength that's been lost by cutting here, get access to do a better repair on the previous damage (before I bought it) and then to carefully shape a ply frame with strong magnets to put the cockpit back on.
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onetenor, It was on amazon and I was flippin lucky to get it! I've now got "Flight without formulae" and "Designing Model Aircraft". I've not managed to find the buzzards book yet, but I'll keep hunting! Thanks all!
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I agree with any of the arguments here. In some places we're being ripped off, in others we're not. For example, the Halfords car washing bucket, flimsy and small cost 6 times more than a good solid builders bucket from B&Q (when I last bought one anyway). In that case yes, a pure and clear rip off! But, looking at the original post about "£1 worth of plastic" being sold for £27.48, I don't agree with. I was reminded of this recently when pricing up some workshops we're providing to companies, charging £990 for a half day but then only paying the instructor £300. Rip off? Actually no, when we added up the cost of materials, marketing, sales commission, preparation, accounts, tax etc, we actually still don't make very much of course. Then it comes to 'value', what's it worth to you? If that £1 of plastic saves me a few hours work, then it's 'worth' £30 or more to me! If I was retired and had lots of time, then maybe I'd buy the bit of plastic and make something... How long is a piece of string?
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What wind speed to lift a 3.5kg delta?
Tony Kenny replied to Tony Kenny's topic in Slope Soaring and Dynamic Soaring
All good stuff and lots of food for thought, thank you. Whilst I'm at it, this is going to be too big to launch by myself and at my nearest slope I'm often alone. Would it affect much if I screw a handle to the bottom of the delta wing so i can one hand launch? It does have a fixed undercarriage for normal runway work but it's not fitted in such a way that it can be removed. -
Regarding what's going on in the hobby, I've been out of it for about a decade, but, in the last year, I've only managed one contact despite any many calls out on 2m and on a few local repeaters. Just doesn't seem to be the people out there anymore. As mentioned, the real reason I got back on the air was to have some form of "emergency" comms if we're cycling in an area with no mobile signal, though I'm also considering introducing the kids to SOTA when they'er old enough.
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What wind speed to lift a 3.5kg delta?
Tony Kenny replied to Tony Kenny's topic in Slope Soaring and Dynamic Soaring
The wing itself is approx 108cm at the base, 82cm long, so an area of 4438 cmsq approx. That website give the wing loading of 7.9g/dm2 -
What wind speed to lift a 3.5kg delta?
Tony Kenny replied to Tony Kenny's topic in Slope Soaring and Dynamic Soaring
Good point... I'll go measure it this evening and then try to remember trig from my school days a quarter century ago -
Posted by Mark Kettle 1 on 02/09/2017 08:50:22: Morning Tony, would you consider taking your model to the PSSA meeting at the Great Orme in October. If you come with the family and have children there's plenty to do away from the slope in the local town close by called Llandudno. **LINK** Hi Mark, My wife doesn't want to be left alone in the town, but, I'm slowly working on her to be allowed a solo trip out for the weekend! The plan will be ready to fly by then, but I'm keep the aesthetics as a winter project.
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I know, it's not just about the wind speed, but also about the slope itself in how much lift it's generating from that wind. But it got you here didn't it? So, is there a rough guide I could use to determine what kind of conditions are going to be suitable to lift 3.5kg of delta wing model in a pure slope soaring environment, without having to throttle up the motor? thanks in advance Tony
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That's a good point, with the way I slide the wings onto a shelf, they could have got disturbed enough to cause a problem but still look aligned., I'll check them out. cheers!
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Aha! they have both come off and some point and been repaired, the one on the left has a lose bit about 2cm deep, could that tiny bit make that much of a difference? Maybe after so many repairs, I'm getting close to replacing the wings, or at least having a new set as a backup.
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Servos appears to work well in pre flights, no strange sounds, all surfaces moved in sync with each other.
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Actually, for a change I didn't have a lead trapped on the outside of the fuz, which is usually out the right hand side, but can that cause enough drag to induce a roll, or in this case to prevent a roll as today i didn't have the lead trapped outside.
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Today I had my Phoenix 2k in the air again, I've flown this dozens of times and it's my most stable model that gives me hours of relaxation. But today, she was rolling left and i had to put in about 30% aileron to keep her level. This was happening regardless of direction of flight. Once the trim was sorted, she was straight and level. The wing looks just as straight as usual, the control surfaces looked level, no other changes to the model and everything looked normal. Any ideas why she might have started with such an obvious roll? I did notice a _slight_ side/side woble on the horizontal stabiliser, could that cause a roll though?
