Allen Mercury 35 Diesel - Review & Test Run

[@robinbeckford]

As I recall, they make peak power running an APC 9x4 or 8x6 (same load). A good one will turn about 12,00 rpm. They were popular in a FF power class at one time because they had enough torque to spin a 9" prop and were light for the output. D-2000 fuel works well. They're always fussy on comp until you get the sweet spot that it will hold. Then launch it quickly before it changes its mind |-) That long fuel path may not be helping, either. Anyway, it's good to see one still running. Thanks.

[@wheater5]

Somewhere in my garage I still have the blue top, still in its box.

[@NormanLedoyen]

As usual Mark. Nice BLACK running engine. 555555

[@MarkRobinson555]

Hahahaha, come on Norm, I know you love a good diesel!!

[@EnglishTurbines]

An 8 x 6 is a bit small for a 3.5 cc diesel....The AM engines were a bit prone to overheating as I recall...🤔😏..Sounded overcompressed...😮

[@MarkRobinson555]

Thanks for the comment

[@alanjux9915]

Hi Mark, I too am fascinated by old engines - a bit of nostalgia I guess. Back in the 70s I had an AM 35 in a Yeoman Dixielander, a power duration model designed by George Fuller. I eventually lost it when the dethermaliser failed and it went out of sight from about a 10 second engine run. Never saw it again...The AM35 is a real screamer and likes to rev as you found out. Yours seemed rather sensitive to compression and needle valve adjustments but you do tend to be a bit quick with them, particularly the needle valve. Could I suggest you make smaller/slower adjustments and give the engine a chance to catch up. Thanks for another fascinating video.

[@MarkRobinson555]

Thanks for the comment and appreciate the advice

[@fiery1962]

10 x 4 or 9 x 6 broad blade prop. Nice engine, sounds healthy.

[@MarkRobinson555]

Thanks for the comment, appreciated

[@wrxs1781]

Good video Mark.

[@MarkRobinson555]

Glad you enjoyed it

[@brendongunnell1299]

The AM 35 is the worst one of them all, well known for throwing conrod's and even shafts, the 15 and the 25 are very nice engines, I have the range, 10, 15, 25 & 35

[@yosiotter8677]

良い映像表現です。見ていてヒート気味なのがわかります。AMディーゼルはその傾向があって、日本の夏では不調になります。

[@terryblackman6217]

I have to agree with English Turbines, a slightly larger prop. One of our club members back in the day had one of these in a control line Tiger Moth, the motor backfired in mid air and set light to the model. You can imagine the panic. Nick one Mark.

[@MarkRobinson555]

Hi Terry, thanks for the comment, greatly appreciated

[@rogerbourne7159]

Great motors! Used one in 1960’s on c/l aerobatic models, good power. Thanks for reminding me! Roger in Sppain 77

[@MarkRobinson555]

Pleased you enjoyed it, thanks for the comment

[@robinboucherwonderfulflight]

Hi, Thank you for sharing your run of the AM 3.5., wonderful. Is you were to rank the following diesel engine manufacturers, how would you rank them? PAW Diesel, ED Diesel, AM Diesel? In terms of power, ease to start and adjust? Are any better or worst to use in scale control line models? Thank you

[@MarkRobinson555]

In my opinion ED and PAW are great engines, easy starting and great running. PAW have the advantage of still being made and parts are available, ED hasn't been made for decades. All depends what you want it for and what you prefer. Thanks for the comment

[@robinboucherwonderfulflight]

@@MarkRobinson555 Thank you Mark.

[@EleanorPeterson]

I just wanted to mention to anyone new to this kind of thing that aeromodelling-style diesel engines are different from full-sized car, truck, rail and ship diesel engines. Yes, they run on compression alone with no sparks or electrics, but they use a fuel consisting (roughly) of ⅓ ether, ⅓ paraffin [a.k.a. kerosene], and ⅓ castor oil. And on a cold, damp, misty Sunday morning at the flying field they smell GREAT! 😁