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a rule of thumb is that a sleeveless will give you 75% of what a fullsuit will give you. in other words, if you'll get 8 sec per 100m of extra speed out of a fullsuit, you'll get 6 sec out of a longjohn.
there is more to the equation when you add that you're considering a T1. the numbers i give you above refer to just raw speed over, say, a 200m swim. where the T1 gives you an extra boost over any other fullsuit is later in the swim. if you were to be able to monitor your cadence in the water (and there is a device for that, as a matter of fact), you'd see that your cadence (i.e., stroke rate) would be considerably slower in a standard full than in a T1 or other good 2pc wetsuit (assuming there was another good 2pc wetsuit available). the lower stroke rate = slower speed.
but that's another issue, separate from what you asked, so i'll leave it there.
I remember that the most optimistic speed increase by a brand, my 4'' per 100m on average. some slower swimmers will see more, some faster swimmers will see less.
does it suggest something like 10'' for a full compare to no wetsuit?
if this is the case you should mention that this would be only for very slow swimmers.
however, that's a joke isn't it?? cadence monitor?
what about counting your strokes?
you should ALWAYS do that! let's say you go for
10x200, every 2nd 200 count the number of stroke for the 1st and 3rd 50, and make sure that the number does not drop. forces you to focus on technique, long slow strokes etc...really good to keep the focus on endurance sets.
can do the same thing on fast sets to make sure you don't start swimming ugly...with a speedo cadence monitor, you are not going to check your watch under water, and once you get to the whole you should focus on recovery, not on cadence.
if you check the number of strokes at home, the feedback is too late...if you added 2 strokes per 50 for half the set, you have wasted your time.
i use these numbers as examples. the LEAST advantage i ever saw a fellow get out of a fullsuit was 4sec per 100m, and the MOST i ever saw was 15sec over 100m. the better swimmer you are, the less advantage you'll get. in these two cases i mention, if the wearers would've used a longjohn (sleeveless) suit in place of the fullsuit, they'd still have gone faster vs no wetsuit, but probably 3sec and 11-12sec respectively.
i wasn't talking about counting strokes--stroke length--but considering the rate of your turnover. yes, sure, you want to make sure you don't clip your stroke, and number of strokes per lap is important. but your speed is going to go way down if your ability to keep up your rate of turnover is impinged upon by a restrictive wetsuit. something like an aquapacer is a good way to judge that. when i do a (personal) wetsuit evaluation i'll stick this thing on and swim 500m or so, and sure i'll consider the clock, but i'll also consider stroke rate in the latter stages of the swim.
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I don't use my full wetsuit in that race, but I really have no idea whether that is the right approach. It is easy to give back a minute or two on the run if you are too hot.
Come on, Francois...
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what about counting your strokes?
- Open water swims.
- What is my cadence when I am NOT thinking about my cadence?
- Counting strokes and dividing by time gets challenging during long continuous swims.
- Keeping track of both lengths and strokes per length sometimes exceeds my mental capacity!
I don't think I'ld spend $100 on one, but one would be useful at times.
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LOL. Very True. Personally, I think that the fastest and best way to get faster in the water is not a wetsuit, but better stroke technique. But the T1 is awsome.
2. a bike computer that computes your Cx when you ride and optimizes Cx on the fly depending on morphology
3. a watch with captors measuring your electrolyte balance, sugar levels while you train/race and beeps to tell you what to drink or eat.
4. a robot that tells you that this extra beer is really too much even though it's NY's eve :-)
have fun tomorrow, be safe out on the road,
don't drink and drive (don't drink..)