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Comment by K10D posted on Loud toys....for boys at 03/07/2011 - 01:02
cbrog wrote:
Heavens - that brings back memories! I am surprised that they are still allowed in these PC and H&S obsessed days. First saw these some 55 years ago at a control line event held in Preston Park, Brighton. I was very impressed - much cooler (and faster) than my Yulon 30 powered prop efforts.....
They will be at the British National Championships this August Bank holiday weekend at Barkston Heath...soooo will I.Heavens - that brings back memories! I am surprised that they are still allowed in these PC and H&S obsessed days. First saw these some 55 years ago at a control line event held in Preston Park, Brighton. I was very impressed - much cooler (and faster) than my Yulon 30 powered prop efforts.....
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Comment by K10D posted on Loud toys....for boys at 03/07/2011 - 00:59
It is a good idea.
Only reason I didn't recommend some thing similar or your particular link is that its a one item, one job application and the unit you linked to is too shy on voltage for this application but useful for many others.
We need 24v to give us a headroom voltage as the nicads will hit 1.55 to 1.65v per cell when fully charged whilst still connected to the charger. So expected peak pack voltage will be 19v or a little over. Then add the 1.25v for the LM317, the .65v for the 1N4001 and the 1.7v for the LED and we approach 22v, hence the 24v wall cube.
Best regards
Only reason I didn't recommend some thing similar or your particular link is that its a one item, one job application and the unit you linked to is too shy on voltage for this application but useful for many others.
We need 24v to give us a headroom voltage as the nicads will hit 1.55 to 1.65v per cell when fully charged whilst still connected to the charger. So expected peak pack voltage will be 19v or a little over. Then add the 1.25v for the LM317, the .65v for the 1N4001 and the 1.7v for the LED and we approach 22v, hence the 24v wall cube.
Best regards
Comment by K10D posted on WTB (or borrow?) Pentax Power Pack M at 03/07/2011 - 00:53
I voted no. I still have lenses from 1974 and there's nothing on the current lens or body offerings that would give me anything I don't already have covered. My last purchase was a replacement 16-50 SDM due to me breaking my first example. Before that it was the 50-135 SDM in 2009.
I have been buying lenses etc. since, but from the bright side.
Best regards
I have been buying lenses etc. since, but from the bright side.
Best regards
Comment by K10D posted on So what are you going to do RE: Ricoh purchase of Pentax at 03/07/2011 - 00:39
Comment by K10D posted on True digital film at 02/07/2011 - 13:19
Welcome to the forum.
Best regards
Best regards
Comment by K10D posted on Defecting from Nikon - partially :) at 02/07/2011 - 12:24
Mikerobe wrote:
Is this something you have done yourself out of interest?
As 5 x 3.7V is 18.5V would 4 packs at 14.8V be better? Or can the Motordrive LX (or MX as I think they mutually share the M power packs?) and associated control circuit handle 18.5V OK?
Mike 8-{>
PS apologies for kind of hijacking a Classifieds thread.
Fully charged NiCads "straight off charge" will show 1.5v so present an initial 18v level to the circuit. Is this something you have done yourself out of interest?
As 5 x 3.7V is 18.5V would 4 packs at 14.8V be better? Or can the Motordrive LX (or MX as I think they mutually share the M power packs?) and associated control circuit handle 18.5V OK?
Mike 8-{>
PS apologies for kind of hijacking a Classifieds thread.
I have used LiPo conversions in several bits of kit including my Maglite torches( a dummy plastic D cell-the type that takes an AA cell, is used for the lamp connection/contact). As you say, the correct charger is a must and the conversions must be done by some one comfortable with the work.
Kris should try his NiCads to see if they are OK. If changed to the newer-higher capacity cells, then a simple resistor change ( R=1.25/mA) would be all that is required. The LED I listed is good for a max of 30mA through it though I'd be more happy at 25mA max.
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Comment by K10D posted on WTB (or borrow?) Pentax Power Pack M at 02/07/2011 - 12:12
Algernon wrote:
Wouldn't LiPo's be a bad idea in this instance Gary, were the
unit is not going to be used that often and they would be stored
almost 100% charged? Also the life of them is probably only 3-4 years.
I've some AA Cadnica's from about 10 years ago that still show full
capacity after quite long periods of storage and use in flashguns
and cameras.
It concerns me that nearly everything you buy now has Li-ion batteries
in it and replacements probably won't be available in 3 years time.
I've still got drills and a Bosch cordless hedge trimmer with Ni-Cads
still going strong after 10 years intermittent use.
A valid point Algi.Wouldn't LiPo's be a bad idea in this instance Gary, were the
unit is not going to be used that often and they would be stored
almost 100% charged? Also the life of them is probably only 3-4 years.
I've some AA Cadnica's from about 10 years ago that still show full
capacity after quite long periods of storage and use in flashguns
and cameras.
It concerns me that nearly everything you buy now has Li-ion batteries
in it and replacements probably won't be available in 3 years time.
I've still got drills and a Bosch cordless hedge trimmer with Ni-Cads
still going strong after 10 years intermittent use.
A few years back, I converted all my pistol drills to LiPo's. Due to me being away from the UK for extended periods I had thought that there would be an issue. Oddly enough, they are fine? I do leave them fully charged as well.
Using LiPo's in the LX pack is overkill. I doubt many people would use the packs enough to justify the cost of a decent LiPo charger.
On that note, I'm waiting for two tagged 16850 cells to arrive to fit a Chinese K7 grip.
Best regards
Comment by K10D posted on WTB (or borrow?) Pentax Power Pack M at 02/07/2011 - 11:57
The Q line should be safe. The sale of Pentax was announced only a few days after the Q was announced. Ricoh must have OK'd that announcement, which would lead one to think that they are happy with that line.
I've been through this with Minolta. I still have my 7D and if it ever dies, I can always buy a Sony body to use with my Minolta lenses. Just don't like the idea of SONY on the front of a DSLR....I suppose I can paint it out though?
Best regards
I've been through this with Minolta. I still have my 7D and if it ever dies, I can always buy a Sony body to use with my Minolta lenses. Just don't like the idea of SONY on the front of a DSLR....I suppose I can paint it out though?
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Comment by K10D posted on Ricoh to buy Pentax at 02/07/2011 - 11:27
A couple of pulse jets. Taken at Barkston Heath Festival of Flight.
Pulse jet on a take off dolly
pulse jet
Typically run on kerosene and producing in excess of 120dB, flown on 52 feet control lines.
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Pulse jet on a take off dolly
pulse jet
Typically run on kerosene and producing in excess of 120dB, flown on 52 feet control lines.
Best regards
Comment by K10D posted on Loud toys....for boys at 02/07/2011 - 11:18
I used to have one of these, also on control lines, though it looked a bit different. Mine had a twin boom tail, and was bright yellow. Great fun, and they make a dreadful racket! Unfortunately I eventually wrote it off trying one aerobatic manouvre too many. It ended up almost completely buried!
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