NGH 17cc petrol what to put it in

[Brian Dorricott 1]

I have a surplus NGH 17cc petrol engine and cannot decide what to put it in plane wise . I know that a 9cc NGH is 46-50 ish but not sure what the petrol 17cc equates too . Anyone put the NGH 17cc in anything interesting and what size was it ? It looks a big lump when it's your hand but I'm using a G5 plug so no battery and cdi ( got toasted in a fire) so weighs little less. Any successful marriages using NGH 17cc out there ? Or should I sell it and buy a Zenoah .

[Richard Wills 2]

lad at our club had one in a wot 4 xl, 68" and 10ish lbs. Flew fine but not exactly powerful. A decent 91 glow would embarass it.

[Colin Hooper]

I have fitted the NGH 17cc into an Acro Wot and a Seagull Edge 540 (the 60 size one) Both fly very well and with the Just Engine pepper pot in the exhaust they are often thought to be 4 strokes.

[Dale Bradly]

I've got one in a 72" Harvard and it goes bloody well, almost too much power. I'd happily put it in any scale/warbird looking for a .91 4st or thereabouts.

[john stones 1 - Moderator]

Got mine in a Seagull Funky Cub, tonks it around no bother, lovely big aeros with it, throttles nice and is quiet on a wrap around pitts exhaust 14x8 on, good on juice as well.

[Brian Dorricott 1]

Some good ideas and no gloop to clean off after every flight , plenty of choices in that range . Anything 60 size sounds just right then thanks for replies Harvard or Acrowot sound nice .

[Denis Watkins]

Posted by Brian Dorricott 1 on 28/08/2020 19:57:01:

I have a surplus NGH 17cc petrol engine and cannot decide what to put it in plane wise . I know that a 9cc NGH is 46-50 ish but not sure what the petrol 17cc equates too . Anyone put the NGH 17cc in anything interesting and what size was it ? It looks a big lump when it's your hand but I'm using a G5 plug so no battery and cdi ( got toasted in a fire) so weighs little less. Any successful marriages using NGH 17cc out there ? Or should I sell it and buy a Zenoah .

Help me understand please Brian

How can the motor be used without an ignition ando

Somehow the 90 motor is to be used in a 60 size model

Thank you

[cymaz]

There’s about 16cc to the cubic inch. So any .90 size airframe would be in the right area. Just remember the extra weight of batteries and room needed for ignition box.

[Frank Skilbeck]

Brian is the G5 petrol glow plug a direct fit, i.e. the same thread as the spark plug or do you need an adapter?

[Brian Dorricott 1]

As the NGH 17cc is already a petrol engine if you put in the G5 plug and ignite it voila it runs no differently from using the CDI pack . As my CDI packs all got burned in a fire but the engines were elsewhere £7 for a G5 plug or £50+ for a CDI was a no brainer ! This setup is no different to the smallest petrol OS 2 stroke but is only applicable to petrol engines with same size thread as a glow plug . No extra battery and CDI weight to worry about , the only real downside is the bark of the engine despite buying a "quiet" exhaust from JE . It is a little loud at WOT and the noise a gruff bark but that's nothing really to do with ignition swop but the exhaust design . Look up OS GGT10 petrol engine that's the same setup and OS don't usually get it wrong !