I've got a 14' (4.3m) ply Hartley sailboat with a 15hp outboard. It can be run with or without the mast. I've only used it a couple of times, it's my first boat. I have done my Day Skipper's though.

As ffocus has said above in most fishing scenarios you will be very unlikely to use 5x depth of wrap. I have a 100m wrap and can anchor in 70m fine for fishing (4.2m boat)

HB_fishdive wrote: As ffocus has said above in most fishing scenarios you will be very unlikely to use 5x depth of wrap. I have a 100m wrap and can anchor in 70m fine for fishing (4.2m boat)

I tend to use either or Danforth or grapple depending on bottom as Danforth can get stuck in rocks.

you may find that the small danforth holds fine with that nice long chain anyway.
As long as the chain has enough length and weight to keep the drag mainly horizontal i cant see it dragging with a small boat like that.
 Agree..
It may 'fail' if anchoring up in rather serious wind/ tide conditions thu... putting that into real life perspective, doubt very much is stupid enough to be out in those conditions, or even 1/2 of them.
 As to length.. like others above, most boats around that size very rarely anchor up in much over 30m, and if fishing thats fine.
Son had 70m on his 5.5m boat which limited him to around the 50m mark off the west coast fish.
 The grapple.. I would not consider or think of it as a "spare anchor"....
the only time I use that is when anchoring up real close into rocks .. and I mean real close...to stop the boat swinging onto the rocks as the tide changes or gusty breeze.
 I do carry a spare anchor (and chain)....have had to cut one free on a deep pin few years ago...lost 9m chain, and about 30m warp.  Having the spare and 40m warp left meant we could still anchor up over night.. didnt have to head home...And this is where having 70/ 100m of warp works well...pick up another 50m and splice on , u still have a good 70m plus in the locker.

 Keep the 9m of chain on the main anchor...
 Splice the 9mm off the grapple onto the main warp.
Put 40 or 50m of 6mm on the grapple and leave the 2m of chain on the grapple.
I do not have chain on the grapple for holding the stern...try throw a grapple with a chain on it....or a 9mm rope.
In saying that, Im considering... an excellent video in a rescent thread on landing on rocks and mooring the boat off the rocks.... maybe adding 1m chain, and 10 or 20mm of 8 or 9mm bungy instead.
 Just means dropping the grapple 1st from the stern, hooking it, keeping the tension on then drop the main anchor.
 A grapple, if that tension comes off, it drops, and there is a good chance it may not 'hook' up the same or at all.

Temp fishing...
Drop in 30m water, 2 to 3 times depth.. thats 70 to 90m out...
 Not many small day boats under 5.5m have much over 50m...plus chain... and they hook up fine, even in the currents off the bottom of Waiheke on big tides.
Reality is
lets face it, its generally an inexperienced person dropping the anchor and the skipper on the helm.
1st order, dont throw the bloody think in too fast... keep feeling the weight, dont want the chain to wrap the anchor on the way down
2nd when hits the bottom, feel the weight start to go on, now drop another 4 or 5m....if low tide  then another 3m.
A turn around the bollard, and wait for it to load up, give it a few more moments then hitch it off.
30m ends up having 40/ 50m out.
Skipper then keeps an eye on landmarks, surrounding boats and gps.
 With enough short link anchor chain, more than 9 times out of 10 the boat holds up... and if doesnt it will be because the warp dropped, thrown out too quick and the anchor tangled the chain on the way down.

Danforth anchors are an old design - if you decide to buy a larger anchor, seriously consider a modern high-holding power anchor like a Rocna/Sarca/Manson. 

Anchoring stuff, particular with regards to warp length, is very much focused around the principle of going to bed and waking up in mostly the same place in the morning.

MikeAqua wrote: I wouldn't carry two anchors on small boat due to the extra space it will take up.  I'd have a dual-purpose anchor like a Kewene.  It's reversible, will hold over hard or soft bottom and has a break-away feature built in.  I carry a second length of chain.  I can use this to lengthen the main chain if required (haven't had to yet).

Yes I use a Kewene anchor they are awesome holds a lot better than a heavier Danforth I had before.

Rozboon wrote: A friend of mine who does a lot of boating really rates the Kewene. Reckons he's never got one irretrievably stuck, even anchoring over some gnarly foul. They're extra safe if you do it properly and attach by the bottom eye then ziptie the chain to the top of the shank.

The Kewene has a break-away slot so in theory no cable tie needed...

But maybe it's sensible to use tie on a smaller craft if you can't safely use the engine to apply enough  pressure to trip the breakaway?