I am putting a Webra 1.20 glow engine in a Dave Patrick Ultimate ARF, his 1.20 size bird.

Does anyone have suggestions on what prop to use and what size fuel tank for a 10 to 12 minute run?

Thanks,

Jerry

Jerry,
I have a Webra 120 in a scratch built Ultimate ( similar in size to yours ).It is a very reliable powerful engine.I use a 20 oz tank & currently a 16.5 x 8 Bolly carbon prop.I previuosly used a 15x8 APC ( a good prop as well ) although the 16.5 x 8 seems a better choice performance wise for my airframe.Hope this helps.

Apc 16x8 worked awesome on mine, had it in a goldberg ultimate.

WHAT WAS YOUR FLY WEIGHT WHEN ALL WAS SAID AND DONE ON YOU ULTIMATE? DID THE 120 HAVE ENOUGH POWER TO HOVER? I RECENTLY PURCHASED A 120 ARF ULTIMAE BY DAVE PATRICK, AND WAS PONDERING WHAT I AM GOING TO USE FOR POWERPLANT.

R/

I have a DP Ultimate and and originally had a YS 120 on it with a APC 16-8 prop and it was awsome in all areas but one.It would just hover (hang on the prop ) with not much pull out.I swapped to a Saito 180 with a APC 18-6 and hang on to your Transmitter! It had unlimitted vertical and honestly I could not tell any difference in flying because of the heavier motor.That plane is great.It won the Biplane shootout in MAN a few months ago.Nowto the big drawback to the Saito 180.Ihad to put an additional tank which brought it up to a 24 oz. cap. to get a comfortable 10 min. flight.That Saito loves fuel!The inverted flatspin is very flat and descends slowly and looks great. Dave

RCFLYER DAVE,
THANKS FOR THE INFO I AM GOING TO GO WITH A SAITO 150 I THINK.

You'll like the 180 better for brute power.

rcflyerdave

what kind of numbers does your Satio 180 turn the 18 x 6 APC?

THOMAS WILLIAMS,
THERE IS NOT MUCH GAIN OVER THE 1.50 IN USING THE 1.80. I THINK IT IS ONLY SOMETHING LIKE 7% INCREASE WITH A LITTLE MORE WEIGHT ON THE 1.80. I REALLY THINK THAT THE 150 IS GOING TO BE THE BETTER WAY TO GO, BUT I AM NOT COMPLETLY SURE YET.
ANY WAY THIS IS MY .2 CENTS WORTH.
R/