Chris Walby
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Posts posted by Chris Walby
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It could be LVC caused by a faulty lipo (assuming its being tested with a prop on it)? if not the the problem lies between the ESC and the operator!
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Its probably even worse if you put a wanted ad anywhere as then you would be offered all kinds of old photos of kit other people actually own.
IMO its like junk mail....low cost and they only need 1 halibut per 10,000 phishes, what have they got to lose?
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I still have a serious concerns regarding the storage of batteries (of any type) inside a metal (conductive) box. Perhaps totally unfounded as everyone who buys an ammo box lines it with a non conductive, non flammable material, but what I have seen this is not always the case.
Accident waiting to happen IMO.
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How far off topic can we go....Mod please delete
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1 hour ago, Graham Bowers said:
Happened to me on Firefox to the extent I prepared longer posts in a word processor. Also, attaching photos would time out. Possibly a Firefox "setting". However
past tense used, as since I switched to the Brave browser, everything is sweetness and light.
A huge benefit of the Brave browser, that as I recall I learned about here, is it strips out the adverts from Youtube.
IMO its network connection and speed, seemed to only happen to me when the internet was on a go slow.....and timed out...and yes I used to type mine in word as well..those were the days 🤣
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Greetings Mike, Try loading a few photos, then going for a cup of tea and then press submit...You might be surprised that it still works.
You can even write a reply, nod off or even reboot the pc and find your message saved ready for you submission...One of the bonusses of the newish website.
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Only experienced one adverse event with a lipo. The battery in question was a tied old 4S3300 so rather than dispose of it I installed it in a start for IC engines. Being left in the flight box, occasional use, but high current may have caused the lipo to degrade. Anyway it seemed a bit limp starting an engine so was checked and was discharged down to about 40%.
Put it on charge in the clubhouse and went to fly a model, then on my return to the clubhouse to a odd smell, very puffed lipo and burn mark on the worktop. Charging stopped, disconnected and lipo moved outside. Later discharged and recycled.
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The important thing is tank to carb orientation (which ever way around the carb body is, does not matter).
Tank the wrong height...might as well drink a pint of castor
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Peter, I heard a similar story regarding Republic P-47 Thunderbolt's and a number of pilots that were killed as they applied excessive throttle on missed landing approaches. Inexperienced pilots were instructed to climb to a safe altitude and sequence through a missed landing approach (flaps, gear, landing speed) then apply full throttle. Shortly after this the aircraft would roll inverted hence teaching a valuable lesson that full power was not required for a go around and to be positively avoided.
In one of the interviews with Eric "Winkle" Brown IIRC it was landing a Mosquito on a carrier. Eric demonstrated with one of the "boffins" onboard a high altitude landing approach with a single engine failure. This resulted in the aircraft rapidity rolling to inverted and the conclusion that hanging a mosquito on the props when landing on a carried was a high risk task with little room for things going wrong. There appears to be no comment from the "boffin" regarding the high altitude inverted flying with a mosquito in its landing configuration, but I bet it was rather exciting!
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Difference between IC and EP...well IC will be ticking over a 2000 rpm and WOT at 10,000 so difference of 8,000 and most like launched at WOT. EP typically 4S and 1100KV so off load motor speed of 16,280 rpm and probably around 15,000 rpm with the prop on. Hence the prop will be accelerated by nearly 50% more rpm.
EP most likely launched before the motor has got to full speed so the accelerating prop has a greater torque effect with EP than IC hence the greater tendency to roll. With very over powered funfighters etc I have found launch at less than wot and waiting until the motor has stopped accelerating helps with the launch.
Open to any other theories though 🙂
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Thanks Peter spot on in my book.
Only thing to add is the issue with depth and speed perception at distance and long low approaches as that it can be difficult to determine the actual air speed of the model.
Last weekend with my Habu ss I was surprised that (with nearly no wind) I needed to extend the final circuit (started at half throttle and dropped to quarter while descending) that it needed no throttle before the final descending turn over the trees. For a delta shape wing it does glide very well.
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Perhaps the best policy is to contain the lipo fire and not allow other material to become involved as they will burn themselves out...in the end.
Or how about using or contacting FireTrace (no personal connection) and asking the professionals how they would deal with a lipo fire??
Automatic Fire Suppression Systems by Firetrace Ltd. - Firetrace
Not cheap, but piece of mind 🙂
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Perhaps its just a case of landing too fast? If I haven't blead all the airspeed off then the model lands, just it still has enough energy and airspeed to tale off again when promoted by a suitable pitch up runway feature. The grass will act as a high drag retard on the wheels and hence keep the model down if landed a bit quick.
I am quite surprised and how slow some EDF will fly/glide and how long I can hold off landing....sometimes well beyond the runway threshold (time to go around)! In part I think its to do with the quite quick flight speed (getting used to quick) and then the pilot not getting accustomed to the low speed characteristics.
A few of the Chris Foss designs reward the pilot with this effect if you have not reduced your air speed suitably, this can be countered with a good dollop of down elevator at the right time, but it does feel weird pushing the nose down especially with a tail dragger.
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IMHO, Its important to launch firmly but accurately, so flat to slight up and slightly body side on underarm chuck.
Has to be left hand as right hand has the throttle cut (ready to launch, switch throttle cut off and then chuck) and thumb with full up and ready to correct any role with the ailerons.
The alternative is put a RX in with gyro and safe. Safe on, full power and lob...once fling straight and level, switch safe off and commence fun
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I will third what Jon said about the SG Hurricane, even if SG gave me one I would give it back. It has major issues and at best will land like a dog, sort of fly ok and never really be a pleasure to fly IMHO as at some point it has to meet the ground.
Others have had some success by adding inches to the nose and remaking the fuselage, moving the UC mounts and adding a gyro, but is it really worth all that effort to end up with a dog?
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Sort of on topic for a GTC
Somewhere on the forums I remember a GTC modeller adjusting the rudder/tail fin shape to reduce the pitch/yaw /roll effect and was wondering if anyone can pinpoint said thread? Its a great model and flies superb on elevator and ailerons, but mine is quite feral in flight when using a lot of rudder!
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11 hours ago, Andy J said:
Been making a bit of progress the last few days with this build and will be installing the engine mounts next. The query I have is should I include a small amount of right thrust on a twin? Assuming little or no down thrust is required given the thrust line is below the wing.
Perhaps see what the plans says as they are for the IC version or await a comment from Peter himself.
I asked Peter regarding my electric standard size GTC and the guidance was no down or side required and very politely suggested that is what the rudder is used for when taking off. As for in flight he mentioned that the GTC was very benign to the point IIRC he flew an entire flight on one engine as he other quit shortly after take off.
I don't think either my Dual Ace, Mosquito, Tiger Cat (all IC) and foam P38 have any down/side thrust(although the P38 does have counter rotating props in the "wrong direction to convention, but scale to the full size).
PPS adding side thrust might produce a weird effect in flight as you increase power and engine speed is slightly different..a bit like Dutch roll and the model yaws and pitch changes. Don't fancy that myself!
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Just to confuse Toto, quite a few ARTF's have handed servos. e.g. one travels in one direction and the other in the opposite direction as it saves a channel or servo reverser!
Applications I have come across where this has been done are gear doors, nose wheel steering and flap servos ether just because they can spec or they can't be bothered to design the issue out...guess if you are buying hundreds at a time the servo manufacturer will accommodate the request.
Have others come across other applications?
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18 hours ago, David P Williams said:
Went to Weston Park today. I’ve been every time for years as it’s my “local” show, only 50 miles up the road. What a disappointment.
I was going to buy a pre-booked ticket for £18, but this turned into £19.90 by the time the various booking and admin fees were added, then they wanted my name, address, email, phone number, etc. so I bailed out, preferring to pay ananymously on the gate.
Arrived at 9am, four lanes to pay, 3 staff members, of course I picked the lane with no one on it and behind someone who wanted to pay by card which they couldn’t handle. After he’d gone, I was ignored. I should have just driven in, don’t think they would have noticed as it as chaotic, but I’m too honest. After shouting “Who can take my money” out of the window for a few minutes someone came over. “A bit of a mess” I said and they said that several expected staff had not turned up. I suggested that they only opened enough lanes for the staff they had.
Once in and parked I was totally underwhelmed by the stands - more sweet/sunglasses/toys/charity stalls than modelling gear. Many of the modelling stands were very expensive jets or giant aerobatic stuff, hardly any average club flyer stuff.
The display line was also disappointing. Half the models have been there in previous years and the volume of models seemed about half that of previous shows.
Very poor value for £23.
Balanced view?
- You decided not to buy on line
- You decided to turn up at probably the busiest time for getting into Weston Park although you live "local"
- Ok there were less stands than previous, what do you expect from a hobby that is dying?
- Plenty of stalls selling ARTF stuff, SLEC balsa and carbon composites if you wanted
- Half the display line have been there previous years. What's the cost of a good size IC warbird £5k to £10k, yeah like I would be changing a model every year
- Cambria funfighters , expensive?
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Very poor value for £23. well that's your opinion. I am not saying it was good value, but no one was forcing you to attend.
- Flying included something for everyone including a good display by full size. Sure they would be criticised if it was focused on only one type.
- Stands were not rammed packed and I could hold some meaningful conversations with suppliers that I would not normally be able to
- Sales for foam chuck glides seemed to do well..even if the parents put the wings on upside down!
In perspective I could have used the M6 toll at £14.30 or sat in the que for 30 minutes, making a round trip 6 hours.
It is what it is, don't attend or whine about it and they will probably not bother the following year, but that won't mean people will automatically go to another show just less shows.
Tin hat on and off to the shed. 😉
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I had a HK UBEC and three small digital servos, just bench testing an idea before putting it to the 38inch model and stirred all the sticks. And the RX browned out!
Measured the voltage on the RX and everything worked until all 3 servos were asked to travel quickly at once. Changed the UBEC to another make and all was ok
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Flew yesterday morning before the wind got up after12 and then again this morning
Most of the time it was less windy than the photo and a very variable direction
Coffee, canned drinks, good chats and 7 flights, more nose weight out of the P38L and T33 + I'll need to take the nose plate off the Habu2 for the lead removal (lead for 4S lipo, but now flying 6S).
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Just a few comments and apologies if I stepped on anyone's toes as it was not intentional, merely a product of the situation at the time. Can't say I was really expecting Manny to ask me to be point of contact at Buckminster, but knowing Jon would not get to Buckminster until close to 10 was happy to be there if anything should happen (although site staff are more than competent when on site).
I thought it went very well with a relaxed flying, no major que to fly and some super Laser powered models flown very well with the conditions at the time. So I would give it a 9 out of 10 and be happy to attend again.
Now the 1 out of 10, In life there will be those who complain and I very rarely find they actually organize anything. Okay the flight line could have a couple of marshals, but you would need two or even three people to totally dedicate their day to this + have the authority to do so. I was totally disgusted that at model air people verbally abused organizers/OW staff for whatever reason it is not acceptable. Yesterday there was a short discussion about how to set the flight line up (totally out of my area of expertise) and agreement, then guess what, most people stuck to it and a minority just ignored. The same with people flying and then others joining with inappropriate models as it was not like there was a rush to get your next flight in. With the numbers attending my vote is to keep it as an informal fly-in, but if people what o have greater control then please volunteer.
Well done Jon and all of his helpers for arranging this, best not leave it another 40 years thought!
PS IMHO there is benefit in booking Buckminster early....its in the diary then people can decide if something else comes along and clashes to attend or not.
PPS perhaps a couple of manufacturer demonstration flight slots for Jon to have some fun and the rest of us sit back and see how its done!
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4 stroke plugs
in IC Engines
Posted
I thought the advice for Laser engines was to get it really nice and hot. Pinch the fuel line and drain tank, the attempt to start until it no longer will run and job done. Not quite sure where the oil is coming from to wet the plug.
Only problem I have is priming engines I can't get to the carb, then it takes a few more spins to pull the fuel through.