Boomerang Sprint Conversion to Gas - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-04-2019, 08:10 AM   #1
BJH424
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Boomerang Sprint Conversion to Gas


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Well I made the decision last summer to get out of Turbines after 4 years and mostly fun and and realized over the winter that of all the jets I've owned that I really miss the Sprint. That got me to thinking , why not put a 35CC pusher in it...

I ran the idea by Larry Roper ( Boomerang Dealer)and he said he knew of an electric powered version but not gas and suggested I go for it. I really like the new V2 with the Snowbirds paint scheme but couldn't bring myself to spend the 2300.00 Ca. and then experiment with that nice new airframe. I found a V1 Sprint airframe from Regina that would fit the bill. I'm in the middle of putting a Snowbird paint scheme with graphics by Callie and installing a RCGF 35RE. After being a DLE fan for many years I put a RCGF 30CC in a 1/4 scale J3 cub and really like the motor. I now have two 30CC twins and one 40CC twin..
The 35RE puts out 19 lbs of static thrust and the Sprint will weigh about 17-18 lbs when finished.

So far the install is much less complicated than I envisioned and I'm working on locating it so the exhaust protrudes thru the flaps and the engine height gives me about 13.5 inches of prop clearance. The distance between the booms is 20 inches so a 19 " pusher prop will be fine with plenty of ground clearance for takeoff the landing flair.

Here are some pictures of the work done to date. More to follow.
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Old 04-04-2019, 10:09 AM   #2
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Re: Boomerang Sprint Conversion to Gas

Hey Brian, a different concept but oh what a pity.....lol ! With a heavy engine , prop and muffler and the extra airframe reinforcing behind the CG , then there is the lead up front to balance.......wonder what the all up weight will add up to ?
With electric you have a much lighter motor and prop with much less reinforcing and batteries up front. An interesting project.

Last edited by stegl; 04-04-2019 at 10:19 AM.
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Old 04-04-2019, 10:18 AM   #3
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Re: Boomerang Sprint Conversion to Gas

I hear you and understand completely , but now I can relax and fly it anywhere. Thinking of buying a lawn chair. LOL
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Old 04-04-2019, 10:19 AM   #4
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Re: Boomerang Sprint Conversion to Gas

I’m sure a lot of boomerang owners are looking forward to seeing the finished product ��
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Old 04-04-2019, 10:25 AM   #5
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Re: Boomerang Sprint Conversion to Gas

Yaaaaa Brian! Awesome project! This is gonna be such a hoot

I think this will be a lot lighter setup. 35cc, ignition and iBec will be way lighter than a turbine and battery and instead of that 4L tank of fuel you will only need a 500cc at max!

Will be over 6lbs lighter take off weight just due to fuel alone!
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Old 04-04-2019, 12:04 PM   #6
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Re: Boomerang Sprint Conversion to Gas

Do you plan on using an electric starter of sorts? Going to be an awkward place to try and flip the prop.
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Old 04-04-2019, 12:40 PM   #7
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Re: Boomerang Sprint Conversion to Gas

I would be concerned with cooling.
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Old 04-04-2019, 01:08 PM   #8
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Re: Boomerang Sprint Conversion to Gas

Quote:
Originally Posted by Mike Sebastien View Post
I would be concerned with cooling.
I have the same concerns Mike . Looked at installing it upright but to maintain the prop clearance the cylinder head only protrudes about 1/2 inch above the fuselage. With it inverted the cylinder is right down in the middle of the air intake airflow. With that big exit area the airflow should be Ok. fingers crossed.
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Old 04-04-2019, 01:26 PM   #9
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Re: Boomerang Sprint Conversion to Gas

I doubt the weight will be an issue. The specs say that engine weighs 2.03lbs, a VT80BL is 2.1lbs (engine weight not installed weight). Judging from the engine standoffs the firewall and most reinforcing will be very close to the CG. The question is how will the airframe stand up to the vibration. I know they are tough airframes, constant vibration is tough on any airframe though.
I doubt cooling once moving will be any issue with the intakes blowing directly over the engine, as with any pusher you probably dont want to run it on the ground for very long is all I would say.
Interesting conversion. Good luck with it!
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Old 04-04-2019, 01:32 PM   #10
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Re: Boomerang Sprint Conversion to Gas

Quote:
Originally Posted by Ramz View Post
Do you plan on using an electric starter of sorts? Going to be an awkward place to try and flip the prop.
No electric start. Will take a little getting use to.
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