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It has to be a bit more than 'engine off' - advice from the NACC is that the engine needs to be made incapable of being started, achieved through the removal or absence of components, and just what counts as 'incapable' is a matter of judgement.
Quite correct about it originally being a light industrial engine of about 1 h.p. - enough oomph via friction drive against the tyre for around 8% inclines without pedalling - much steeper and it all slows down, and as the revs drop so does the power, hence the need for pedal assistance to keep the speed up somewhere above 15mph.
This particular problem comes from living in the Clee Hills - if I want to go more than a couple of miles from home I encounter gradients between 12% (preferred route) and 20% (very much 1 way)
If I was to be honest, the real problem is using it in the first place...
I suspect another helmet, this time with a removable liner for cleaning, is the way forward, and accept that on a warm day I'll be very warm. Unless anyone knows a better way?
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MrE
Constable_Savage
I did look into this, when the engine is running you need a registration plate, MOT (daylight if no permanent lights), insurance and a helmet, engine off and boom! it's a normal bicycle.
Does the Trojan not have enough oomph to get you up the hill on it's own?
Originally a lathe motor, IIRC.