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C4 Monoflap Impressions

Thread Status: Hello , There was no answer in this thread for more than 60 days.
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Fondueset

Carp Whisperer
Jul 27, 2004
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Hey Everybody,

Got my feet into a C4 monoflap this weekend. What I've primarily heard about this fin is that its 'too soft'. This is certainly true if you are thinking of it in terms of other freediving monofins. But I think this fin is designed with a different emphasis.

About the Fin:

Build Quality: Non-issue. The fin is simple and extremely tough

Comfort: You don't even know you're wearing it. THE most comfortable monofin I've ever worn - more comfortable even than the Lunocet with its bike shoes.

Power: Obviously - it's not a power fin. My dive buddy, who used the monoflap, says there is no question it is much more powerful than dolphin kicking with his falcon 40s - but you'll overpower it if you treat it like a hyperfin.

Drag and blade angle: The C4 monoflap has very low drag and glides well. I don't know the exact blade angle - but it's substantial. It would be interesting to see someone do long dynamics in this fin. You might have to kick a little more, but energy expenditure would be slight. The fin is slightly negative in the water - and has no compressible materials.



Swimming technique: It gives an okay return against a strong kick - but seems to come into it's own in cruise mode. Here you can maintain speed with less energy output than a conventional mono. Likewise with surface swimming. I felt no lack of power in the vertical - but we did not have a chance to go deep.

I think if you are going for speed you would want to increase frequency to exploit the whip-like wave this fin has - rather that overpowering it with hard kicks. For cruising its best to feel into the fin and find a nice groove that utilizes it's flexibility and responsiveness. Once you do that its pretty efficient!

What I think its good for:
Better than a normal mono for sustained cruising, holding station in current, violent surf entries, spearfishing, u/w photography.
You can really maneuver with this fin. Its so easy and relaxing to swim with - I think it would be great for long open water dives down to 30m or so.

Conclusion: The C4 Monoflap is a unique and extremely well-made monofin. To me it seems geared to recreational freediving with an eye toward endurance, maneuverability, comfort and durability. I did not expect to like this fin, but I do. In fact I wish I'd had it in the Bahamas when we went out through and intense surf entry to visit the reef sharks. In my opinion it's the perfect fin for that kind of diving.

In short - an excellent open water recreational freediving fin - but you need to retool your technique to exploit it's strengths.


(ps - I don't work for C4 or anything)

Coming soon!! My in depth review of the Tropol Non-axial (aka 'hyper') fin!!

Attached are some shots of my dive buddy, Jason, playing with the C4 Mono.
 
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Thanks for sharing, cool review!
I remember reading the designer of the C4 Monoflap, Marco Bonfanti, saying that this one is intended more for maximum speed than for sudden acceleration, and that his own recommendation was about the fact that the Monoflap gives its best more in open water and deep dives than for pool dynamics (in pool you need immediate acceleration more than a higher but progressive speed).
I have the impression that your review confirms what he said....(?)
 
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I think so - If by maximum speed you mean sustained/continuous speed. It is a really good fin for cruising. I wonder about dynamics though - possibly with a more continuous/slow kick - or a different kick glide cycle. The Monoflap has less drag than a conventional monofin - so, even though it does not accelerate as quickly, it may sustain the glide longer.

I did not really try for high speed with it...yet
 
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Thanks for the review, Fondueset! It is real that we hear very little about the fin, despite that it is available already since about a year. From what you write, it might be also well suitable for slow simmers in DYN.

Beautiful photos, BTW (as usually from you)! I like especially the second one - perfect composition and excellent colours. You should propose it to C4 Carbon as a promotional photo!

Also looking forward to your Tropol review. Have you already received it?
 
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Hi Trux.

I think it is very good for slow swimming.

I have had the Tropol out twice.
I don't want to spoil the review so I will just use this ambiguous 'americanism':

"DUDE!"
 
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Here is a short video with the C4. This was the first time I wore it - so I would say my technique needs work with this fin ( have a bad habit, from swimming under people in the pool, of swimming too close to the bottom - I kept hitting and having to bend my knees). My dive buddy Jason is wearing it in the second part of the video. His technique is quite poor, but you can see the Monoflap is forgiving.

[ame=http://www.youtube.com/watch?v=DjfZ976-VDo]YouTube - C4 Monoflap[/ame]
 
interesting, why do you say it has less drag? wouldnt be due to angle surely, or are you only comparing to a traditional monofin not hyperfin with large angle?

just curious.

one of the stores i know has one may have to give it a try.

DD
 
That makes quite sence - the friction drag is about the same as at monofin (about the same square area of the blade, perhaps ony slightly bigger), but the pressure drag, which is the most important factor, is quite reduced at this fin, due to its narow form. Another factor is induced drag that is better at wide (high ratio) blades, but the classical monofin is not sufficiently wide to profit from it significantly.
 
hmm interesting that makes a bit some sense will have to look into the different kinds of drag a bit more, i would have thought that the large angle 25+ degrees found on many hyper finswould have made a significant drag reduction. so what you are saying is that pressure drag would be less on a tradfional mono coamared to a hyper fin because there is less frontal surface area? (when put in the correct position)

DD
 
Yes, that's it. But also the possible less important angle plays less role at this blade than at the short one, because the blade will flex easier due its length, and pose less resistance, hence further reducing the pressure drag despite lower angle. Additionally, Fondueset wrote that the blade angle was rather important.
 
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Nice discussion - you guys are more scientific than I!
There is a good angle on the C4 - not sure what - but I am guessing something around maybe 15 - I don't have it with me right now but I'm sure someone at C4 must know :). I was mainly thinking about how narrow the fin is compared with a traditional or hyper monofin. Basically it is not as wide as my shoulders. You don't really feel it back there at all.
 
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Another factor is induced drag that is better at wide (high ratio) blades, but the classical monofin is not sufficiently wide to profit from it significantly.

I would very roughly estimate that the induced drag of a c4 mono is about arround 3 times higher compared to a conventional hyperfin.

Given that the area and produced "thrust" of both fins are arround the same, the comparison reduces to 1/(aspectratio1*eliptical-nes1) versus 1/(aspectratio2 * eliptical-nes2).

Aspectratio of a hyper is > 1. roughly estimated arround 1.2
Apsectratio of a c4 mono << 1. roughly estimated below 0.5

The c4 mono is way further away from the optimum shape of an elipse.

I'd love to take that mono for a swim and see how it works. Seen just from the induced-drag-point-of-view the fin, well let's say, is "not what I imagine to improve performances" ;-) Probaly there are other pros which compensate for this one.

Just my 5 cents, have fun,

Michi
 
Interesting - and probably right :)
What I noticed is that it is quite easy for continuous swimming. We will do some more testing tonight - hopefully in deeper water.
 
i think the ease of continious swimming would not be due to drag but more todo with the flexing of the blade over its length so that the load is released more slowly/continiously as the blade completes its fexing and straightning over a long lengtrh, vs the quick release of energy associated with a more traqditional style mono or hyperfin. basically i'm saying that the blade would still be in wave motion while you start the next kick cycle where as in a mono the blade motion is alreay completed and ready for the next power stroke. basically the C4 mono is acted more like Bi-fins than a mono due to the extended length.

DD
 
Hey Everybody,
It would be interesting to see someone do long dynamics in this fin.

hi fondueset,
i'll try to post a video of Gaspare Battaglia doing a pretty long distance with this fin (167m if i remember well) which he is using in comp

i agree with all of your comments, i tried the fin (altough i'm not a monofin guy) and those are the impressions i gathered
Gaspare always told me the same things, too

about CWT with the c4 mono, he did a -56m in lake and had very very good impressions: the fin reacts well and does not "cut your legs" after turning, nor during the lighter phase of the ascent

here are some pics from which you can try to calculate the blade angle: C4 Carbon
 
Thanks Gabriele - I would like very much to see the video. The fin does not feel weak to me. My friend, who has been using it quite a lot - but is not very experienced in monofins, also likes it for all day cruising. Our pool is opening back up again this week and I plan to take it there for more exact testing.
 
Well, I took the monoflap to Dean's Blue Hole. I continue to have a mixed impression of this fin. I took it to over 30 meters with no problem. Easy dive.

It seems to want a fair amount of amplitude - and to require more knee-bending to get it to really bite when compared with my other fins. The power is there, but the kick is less hydrodynamic than I would like - at least in deep, vertical dives where I've been working on a higher frequency/lower amp kicking style. I didn't feel confident using it to go for personal bests - the fin does not 'feel' powerful - but it is pretty fast and I still wonder if it's not that it works in a different way than a conventional monofin.

Watching other people swim with it I am always amazed by the speed. Will Trubridge tried it and was really flying through the water. I didn't get a chance to ask Will what he thought, but the other guys who tried it really liked it.

About all I can add from using it in the hole is that its got some respectable oomf on the way up.

IMG_1767.jpg

IMG_1761.jpg
 
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Hyperfin or Monoflap?

Wow, I just sent an email to Maksym yesterday to begin deliberations on a hyperfin and then I saw this thread and I am wondering if the monoflap would be more suited for my purposes.

I am a recreational monofinner here on Kauai, now 2 years into the sport and I am completely hooked. I learned using a Finis trainer at a park that has a large walled off ocean pool and because the trainer is only 18" wide I enjoyed being able to turn at virtually any angle while maintaining speed. I do not use the trainer anymore as it is a very inefficient fin. I have a Nemo medium (which is too stiff for me) and a Finis competitor which suits me quite well but I do miss the manueverability of the trainer. I mainly just cruise and explore the reefs here and have just recently started to "monosurf" some smaller waves- quite a hoot! As far as diving goes about 30 feet is my limit and I do not see myself getting too serious about greater depths.

My technique has continued to improve and I was thinking it was time to take a step up in equipment. The comfort and manueverability of the monoflap seems very appealing to me. I am curious what the dimensions of the monoflap are- I could not find any specs at the C4 website.

Fondueset, if I may ask, where did you order your monoflap from? I also was wondering if the foot sizing is accurate on the monoflap as Finis foot sizing requires toe amputation in order to be accurate!
 
Hi Mbuna,

From toes to tip the blade is about 70cm and it is 43.5 cm wide at the widest point.

It is very comfortable - certainly the most comfortable fin of any kind that I've worn. It is also extremely sturdy. You'd have to check but I think the warranty is very good. I don't see how you could break it and changing footpockets is very easy - four coin-operated screws.

I seem to have forgotten to mention - I took the footpockets off and packed the fin inside my luggage for the blue hole trip. I rolled the blade into a sort of 'J' shape to fit it in my bag! Of course it sprang right back when I arrived - it is also very light. In some of the pictures I've posted in this thread you can see how the blade can twist - this would be very good for surfing - probably saving your knees. A regular monofin simply cannot twist like that.

The down side is - not as good with hard-core traditional monofin form - not as much power as a hard hyperfin, expensive.

Offsetting expense is - VERY durable, comfortable and supported by Mark Labocetta . Good for long hours cruising and surfing. (Did I mention it won't break or come apart!?)

On sizing - I got the 45-46 - so I could wear it with thick socks in the winter. I normally wear a 44-45 shoe. To do over, I would probably go a size smaller. I think you'll find Mark or the dealer will change out the footpockets for you for shipping. The footpockets are basically rubber shoes.

I think this fin was built for your type of application.
 
C4-Usa:
Technosport, Inc.
1176 Jensen Drive, Virginia Beach, VA 23451. Phone - 757 428 4744, Fax - 757 428 4155,
Toll Free - 800 853 1911, Email - info@c4-usa.com

You need to talk to Mark "Full Monty" Laboccetta.
 
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