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Forum: General Discussion 12-11-2019, 02:15 PM
Replies: 50
Views: 1,498
Posted By DDW
I think Canada has roughly similar regulatory...

I think Canada has roughly similar regulatory requirements. As far as I know, there are no electric aircraft in the US operating with a standard airworthiness certificate. All the electric sailplanes...
Forum: General Discussion 12-11-2019, 11:34 AM
Replies: 50
Views: 1,498
Posted By DDW
OK, We'll pay off in Nanaimo harbor as we watch...

OK, We'll pay off in Nanaimo harbor as we watch HA Electric 1 take off and fly towards Vancouver. But I'll be drinking free beer.....

Nanaimo to Vancouver is about as short a hop as they make, 30...
Forum: General Discussion 12-10-2019, 09:06 PM
Replies: 50
Views: 1,498
Posted By DDW
I love the idea too, but I'll bet a six pack...

I love the idea too, but I'll bet a six pack against anyone that it won't happen in the next 5 years. At least one beer that it won't be in the next 10. I don't think I'd bet on 20 - a lot can happen...
Forum: General Discussion 12-10-2019, 05:07 PM
Replies: 50
Views: 1,498
Posted By DDW
The weight issue was more about commercial jets....

The weight issue was more about commercial jets. Beavers land and take off at gross weight with no problem. On a Beaver I'd think the challenge is more about getting sufficient duration to be useful,...
Forum: General Discussion 12-10-2019, 12:58 PM
Replies: 50
Views: 1,498
Posted By DDW
The aircraft would need to be designed to land at...

The aircraft would need to be designed to land at max gross weight every time. Airframe, brakes, gear, etc. It will be heavier (not as efficient) and probably require more runway as a result. Not...
Forum: General Discussion 12-10-2019, 01:43 AM
Replies: 50
Views: 1,498
Posted By DDW
Yes, the raw energy density difference is 2...

Yes, the raw energy density difference is 2 orders of magnitude. However one must also consider the conversion efficiency which is 90%+ in electric and 30% or less in internal combustion. That's why...
Forum: General Discussion 12-09-2019, 04:54 PM
Replies: 79
Views: 3,601
Posted By DDW
Just some back of the envelope calcs: This...

Just some back of the envelope calcs:

This year I did about 2000 miles, using 540 gallons of diesel. I'm sure some did much more, but I'd guess that is above average. If I saved 15% in fuel, 81...
Forum: General Discussion 12-09-2019, 11:53 AM
Replies: 50
Views: 1,498
Posted By DDW
One category of electric aircraft that is...

One category of electric aircraft that is commercially viable is auxiliary powered sailplanes. In the past these have used small internal combustion engines, usually a one or two cylinder two stroke...
Forum: Power Systems 12-09-2019, 11:21 AM
Replies: 16
Views: 488
Posted By DDW
You'll have no more trouble in the ICW and...

You'll have no more trouble in the ICW and Bahamas than you do in the Thousand Islands with crab and lobster pots. Unless you plan to go through Maine - that is a whole different universe.
Forum: General Maintenance 12-07-2019, 11:20 AM
Replies: 22
Views: 970
Posted By DDW
I bought a new high end class A motorhome and...

I bought a new high end class A motorhome and they did exactly that!

Drilling out (or drilling for and ez out) a sheet metal screw driven into fiberglass or wood is nearly impossible. The minor...
Forum: General Discussion 12-07-2019, 12:49 AM
Replies: 19
Views: 508
Posted By DDW
Curious about the power. One 450 hp Detroit...

Curious about the power. One 450 hp Detroit doesn't seem like it could be the original engine. The wiki has it as powered by a GE gas turbine - you think that is still in the spares locker?
Forum: Electrical and Electronics & Navigation 12-06-2019, 11:41 AM
Replies: 25
Views: 790
Posted By DDW
Not sure about the newmar but most inverters have...

Not sure about the newmar but most inverters have some surge capacity. For example the Victron will do twice its rating for a short period.
Forum: Electrical and Electronics & Navigation 12-06-2019, 12:04 AM
Replies: 25
Views: 790
Posted By DDW
I'd think you may want to measure the actual draw...

I'd think you may want to measure the actual draw somehow. DC-DC converters typically will have a minimum load that they like before they go out of load regulation. If you install one that is too...
Forum: Electrical and Electronics & Navigation 12-04-2019, 12:54 AM
Replies: 25
Views: 790
Posted By DDW
Actually the Victron Orion products are more of a...

Actually the Victron Orion products are more of a power supply than a battery charger. Some of the Mastervolt ones will do both.
Forum: General Discussion 12-03-2019, 03:30 PM
Replies: 79
Views: 3,601
Posted By DDW
Prior art exists: ...

Prior art exists:

https://i.imgur.com/Spj0rNC.jpg
Forum: General Discussion 12-03-2019, 11:44 AM
Replies: 19
Views: 926
Posted By DDW
A small sump at the low point of the tank has the...

A small sump at the low point of the tank has the same flow characteristics and cleaning potential as a bottom outlet. On a big rig, if the threads or outlet hose leak, it goes onto the ground. In a...
Forum: General Maintenance 12-01-2019, 04:24 PM
Replies: 15
Views: 442
Posted By DDW
Those are not stress cracks, they are shrinkage...

Those are not stress cracks, they are shrinkage cracks from the gelcoat shrinking off the surface. Printing through the finish coat happens because all of the movement of the surface due to thermal...
Forum: General Maintenance 12-01-2019, 11:08 AM
Replies: 15
Views: 442
Posted By DDW
In my experience if you do not sand below the...

In my experience if you do not sand below the cracks, the cracks will eventually print through the paint. You could cover with veiling cloth, but that will be a big fairing job.

Perhaps a gelcoat...
Forum: Electrical and Electronics & Navigation 11-30-2019, 11:18 AM
Replies: 44
Views: 1,999
Posted By DDW
Haven't seen one but it looks a lot like the...

Haven't seen one but it looks a lot like the Kline and has the same large jaws.



Not much less than the Fluke, and about the same as the Extech...
Forum: General Discussion 11-29-2019, 06:42 PM
Replies: 108
Views: 4,962
Posted By DDW
Though, the bulbous tips are to lower the center...

Though, the bulbous tips are to lower the center of gravity. Any effect on sinking in mud is secondary.
Forum: General Discussion 11-27-2019, 09:02 PM
Replies: 34
Views: 1,050
Posted By DDW
Is the 370 a mechanical or electronic engine? If...

Is the 370 a mechanical or electronic engine? If common rail, that information is already available. If mechanical, you need two flowmeters and a comprehensive calibration, once you've done that you...
Forum: General Discussion 11-27-2019, 08:58 PM
Replies: 5
Views: 292
Posted By DDW
That second reference is clearer on implemented...

That second reference is clearer on implemented policy (though seems somewhat at odds with written regulations). If you are leaving it specifically for storage, the documents are required, and you...
Forum: Electrical and Electronics & Navigation 11-27-2019, 08:38 PM
Replies: 44
Views: 1,999
Posted By DDW
Measurements down to 0.01 A and even lower are...

Measurements down to 0.01 A and even lower are quite useful if you are tracking parasitic loads, leakage, etc.

I have the Fluke 325 and an Extech 380941. The Fluke has jaws similar to the Klein...
Forum: General Discussion 11-27-2019, 03:13 PM
Replies: 5
Views: 292
Posted By DDW
I've left my boat in Canada many, many times....

I've left my boat in Canada many, many times. I've never been questioned about it until recently. If you are there with it, it is simply your conveyance, like a car, and can be used there for a...
Forum: General Discussion 11-26-2019, 06:11 PM
Replies: 5
Views: 292
Posted By DDW
Anyone every used Form E99 or E29B when leaving a boat in Canada?

It is required according to CBSA, yet I've never heard of anyone doing it nor do the customs agents seem to know what I am talking about. Likewise a number of marinas and repair facilities in Canada...
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