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Jun 14, 2021, 05:49 AM
www.scotiarc.co.uk - OMP Helis
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Henseleit TDSF


Here's my latest big heli, the Henseleit TDSF. 'SF stand for 'slow flyer' it's inspired by superlight slow flying 3D planes. It's a full size 700 that comes as standard with 710mm blades but it weighs about the same as a typical 500 heli. Mine is under 2.5Kg ready to fly, including battery. I can still take a bit more weight out by trimming the excessively long ESC wires etc.

It's a brilliant concept. It makes for a much cheaper build because the electronics are all what you would usually find in a 500. The battery is 5S 4500mAh, a cheap low 30C rate is fine, no need for expensive high discharge packs. It's a fully 3D capable heli but will return up to 18 minutes flight time. Even at the maximum recommended head speed of 1400rpm I get 9 minutes flights! At 1400rpm due to the crazy light weight, it's performance is what you would expect of a normal 700 at 2000+RPM.

I cant believe other manufacturers have not been inspired to try something similar. Other claimed 'lightweight' 700 helis are at least twice the weight of the TDSF. This heli really is one in the eye for those who claim weight doesnt matter for RC helis!



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Jun 16, 2021, 02:15 PM
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If I ever were to have a 700 size heli, this would be the one. Superb piece of engeneering.
Jun 18, 2021, 03:30 PM
www.scotiarc.co.uk - OMP Helis
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I did some tidying up of the wiring, trimming down the wires removed 40g of weight and it neater
Jul 15, 2021, 09:54 PM
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Quite impressive, 5S, 4500mA and 18 minutes in the sky ?

Anyway the kit price is too high for a bad flier like me and a crash would cost me X times more the price of random 500 size heli
Jul 16, 2021, 01:49 AM
www.scotiarc.co.uk - OMP Helis
Smoggie's Avatar
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Quote:
Originally Posted by Radikal
Quite impressive, 5S, 4500mA and 18 minutes in the sky ?

Anyway the kit price is too high for a bad flier like me and a crash would cost me X times more the price of random 500 size heli
Yes, you can get 18 minutes without any trouble by running lower rpm. I was toying with the idea of putting both batteries in to make a 5s 9000mAh pack and see how long I could get, but it would be quite boring!

As for price, it's not really fair to compare a 700 to the price of a 500, but if you compare the TDSF to any other 700 it's actually great value. Building a 'mainstream' 700 such as a SAB Goblin or a Mikado Logo etc would cost you a lot more.
Jul 19, 2021, 11:08 PM
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Quote:
Originally Posted by Smoggie
if you compare the TDSF to any other 700 it's actually great value.
How much is a crash ? tail boom, main shaft, canopy, gearing....
Jul 21, 2021, 05:21 AM
www.scotiarc.co.uk - OMP Helis
Smoggie's Avatar
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Quote:
Originally Posted by Radikal
How much is a crash ? tail boom, main shaft, canopy, gearing....
I was talking about the ready to fly build cost in comparison with other 700s.

However all the parts prices are on Henseleit's website. It's a 'high end' product made in Germany so never going to be cheap on individual parts cost compared to some far eastern manufactured helis but it's not too bad.
Main shaft: 19 Euro
Main gear: 45 Euro
Carbon fibre tail boom: 69 Euro
Canopy: 79 Euro


Taking a SAB Kraken as a comparison, those same three parts are 36 Euro, 79 Euro, 98 Euro and 119 Euro respectively.. and the Kraken has at least 3 x as many parts so likely to have to replace more parts in a crash. Other brands will be cheaper of course, SAB are VERY expensive helis and parts these days, but still very popular despite the 'boutique brand' price.
Last edited by Smoggie; Jul 21, 2021 at 05:29 AM.
Jul 29, 2021, 09:28 AM
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Quote:
Originally Posted by Smoggie
SAB are VERY expensive helis and parts these days, but still very popular despite the 'boutique brand' price.
100% agreed....and yet people do think it's the drone business which is killing RC helis evolution.


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