OS Speed 91 HZ-R Nitro Helicopter Engine Unboxing!

[@MikeG4936]

Any thoughts on the comparison vs the 105 after having flown both? I'm hearing they have similar power, but this one is more fuel efficient and vibes less!

[@TheRcworld101]

To be honest I like my 105's better. The 91 is more fuel efficient by a tiny bit, and does recover better inbetween manuvers. I fly my 91 at 2000HS in my Raw 700 Nitro and my 105 at 1960HS both at their prefered RPM ranges. The 91 is a ripper, it pulls hard, and deff naturally has more RPM in it then the 105. However, when you get into it hard with the 91, if you don't manage collective super precise it does like to bog, but will recover almost immedatly. The 105 on the other hand you can tell just has solid torque band, it really holds nice in harder manuvers, but it just dosen't recover as quickly at the 91 when it does bog down from smack flying. Both are super reliable, great quality and solid choice. But so far I need to say I would still fly the 105 over the 91.

[@MikeG4936]

@TheRcworld101 thanks for the review!!

[@TheRcworld101]

@@MikeG4936 No problem! Thank you for the support!